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Mark Wiesner

James B. Duke Distinguished Professor of Civil and Environmental Engineering
Civil and Environmental Engineering
Box 90287, Durham, NC 27708-0287
120 Hudson Hall, Durham, NC 27708-0287

Selected Publications


Mechanistic insights of nanofillers tuning polymer microstructures for enhanced separation performance of nanofiltration membrane

Journal Article Separation and Purification Technology · August 9, 2024 Nanomaterials, added in small quantities as “nanofillers,” have been shown to improve the performance of NF membranes in terms of mechanical properties, anti-fouling characteristics, selectivity, and transport. The goal of this work is to explore the mecha ... Full text Cite

Knowledge and Instance Mapping: architecture for premeditated interoperability of disparate data for materials.

Journal Article Scientific data · February 2024 Predicting and elucidating the impacts of materials on human health and the environment is an unending task that has taken on special significance in the context of nanomaterials research over the last two decades. The properties of materials in environmen ... Full text Cite

Quantifying mechanical abrasion of AgNP nanocomposites: influence of AgNP content on abrasion products and rate of microplastic production

Journal Article Environmental Science: Nano · January 1, 2024 Nanomaterials are used in polymer composites to enhance plastic products' properties. Silver nanoparticles (AgNPs) are added to composites for their antimicrobial and fungicidal properties. Polyethylene terephthalate glycol polymer (PETG) AgNP composite te ... Full text Cite

Extracellular Vesicles and Bacteriophages: New Directions in Environmental Biocolloid Research.

Journal Article Environ Sci Technol · November 7, 2023 There is a long-standing appreciation among environmental engineers and scientists regarding the importance of biologically derived colloidal particles and their environmental fate. This interest has been recently renewed in considering bacteriophages and ... Full text Link to item Cite

Characterizing the Transport and Surface Affinity of Extracellular Vesicles Isolated from Yeast and Bacteria in Well-Characterized Porous Media.

Journal Article Environ Sci Technol · September 5, 2023 Extracellular vesicles (EVs) are membrane-bounded, nanosized particles, produced and secreted by all biological cell types. EVs are ubiquitous in the environment, operating in various roles including intercellular communication and plant immune modulation. ... Full text Link to item Cite

Comparative electrokinetic properties of extracellular vesicles produced by yeast and bacteria.

Journal Article Colloids Surf B Biointerfaces · May 2023 Extracellular vesicles (EVs) are nano-sized, biocolloidal proteoliposomes that have been shown to be produced by all cell types studied to date and are ubiquitous in the environment. Extensive literature on colloidal particles has demonstrated the implicat ... Full text Link to item Cite

Metadata stewardship in nanosafety research: learning from the past, preparing for an “on-the-fly” FAIR future

Journal Article Frontiers in Physics · January 1, 2023 Introduction: Significant progress has been made in terms of best practice in research data management for nanosafety. Some of the underlying approaches to date are, however, overly focussed on the needs of specific research projects or aligned to a single ... Full text Cite

Investigating and Modeling the Regulation of Extracellular Antibiotic Resistance Gene Bioavailability by Naturally Occurring Nanoparticles.

Journal Article Environmental science & technology · November 2022 Extracellular antibiotic resistance genes (eARGs) are widespread in the environment and can genetically transform bacteria. This work examined the role of environmentally relevant nanoparticles (NPs) in regulating eARG bioavailability. eARGs extracted from ... Full text Cite

Predicting emerging chemical content in consumer products using machine learning.

Journal Article The Science of the total environment · August 2022 Chemical ingredients in consumer products are continually changing. To understand our exposure to chemicals and their consequent risk, we need to know their concentrations in products, or chemical weight fractions. Unfortunately, manufacturers rarely repor ... Full text Cite

Relationship between Atomic Force Microscopy and Centrifugation Measurements for Dust Fractions Implicated in Solar Panel Soiling.

Journal Article Environmental science & technology · July 2022 This work tests the reliability of a simple, rapid centrifugal technique to estimate the removal force necessary to detach common airborne particles from the surface of a photovoltaic panel. Previously, we have used atomic force microscopy (AFM) to obtain ... Full text Cite

Study on the mechanisms for the influence of nanomaterials on the separation performance of nanocomposite membrane from a modeling perspective

Journal Article Desalination · June 15, 2022 An understanding of how nanomaterials, serving as “nanofillers” in nanocomposite membranes, affect membrane performance is limited. This study investigates the mechanisms by which nanomaterials affect membrane performance from a paired modeling and experim ... Full text Cite

Exploring the design implications of bacteriophages in mixed suspensions by considering attachment and break-up.

Journal Article Water research · June 2022 The validity and usefulness of implementing bacteriophages into water treatment systems as agents of targeted bacterial inactivation is yet to be determined. While some concerns are still more purely biological in nature other concerns are still chiefly ro ... Full text Cite

Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate

Journal Article Process Safety and Environmental Protection · May 1, 2022 Pre-concentration and separation processes of Rare Earth Elements (REEs) were investigated in terms of several factors. Nitric acid leachate of e-waste was first pre-treated by increasing pH and filtering through microfiltration. For pre-concentration, pre ... Full text Cite

A holistic approach for the recovery of rare earth elements and scandium from secondary sources under a circular economy framework - A review.

Journal Article Chemosphere · April 2022 Limited natural resources and a continuous increase in the demand for modern technological products, is creating a demand and supply gap for rare earth elements (REEs) and Sc. There is therefore a need to adopt the sustainable approach of the circular econ ... Full text Cite

Separation of rare earth elements from mixed-metal feedstocks by micelle enhanced ultrafiltration with sodium dodecyl sulfate.

Journal Article Environmental technology · March 2022 Micelle enhanced ultrafiltration (MEUF) is a surfactant-based membrane separation process that may be used to separate target ions from mixed metal aqueous solutions, such as leachates of coal ash and other geological wastewaters. The ability of MEUF to se ... Full text Cite

From bottle to microplastics: Can we estimate how our plastic products are breaking down?

Journal Article The Science of the total environment · March 2022 Microplastics (MPs) have become an emerging new pollutant of rising concern due to the exponential growth of plastics in consumer products. Most MP and nanoplastic pollution comes from the fragmentation of plastics through mechanical stress, chemical react ... Full text Cite

Process optimization for acidic leaching of rare earth elements (REE) from waste electrical and electronic equipment (WEEE).

Journal Article Environmental science and pollution research international · January 2022 E-waste (EW) from discarded electrical and electronic devices is a potential source of rare earth elements (REEs) that might be recovered from urban and industrial wastes. REEs are essential raw materials for emerging and high technologies. China currently ... Full text Cite

In Vivo Effects of Silver Nanoparticles on Development, Behavior, and Mitochondrial Function are Altered by Genetic Defects in Mitochondrial Dynamics.

Journal Article Environmental science & technology · January 2022 Silver nanoparticles (AgNPs) are extensively used in consumer products and biomedical applications, thus guaranteeing both environmental and human exposures. Despite extensive research addressing AgNP safety, there are still major knowledge gaps regarding ... Full text Cite

Persistence and Environmental Relevance of Extracellular Antibiotic Resistance Genes: Regulation by Nanoparticle Association

Journal Article Environmental Engineering Science · December 1, 2021 Fate of extracellular antibiotic resistance genes (eARGs) - which are widespread in various environments - is dependent on gene persistence. This work examined the previously unconsidered role of environmentally relevant nanoparticles (NPs) in regulating e ... Full text Cite

Impacts of ingested MWCNT-Embedded nanocomposites in Japanese medaka (Oryzias latipes).

Journal Article Nanotoxicology · December 2021 Polymer nanocomposites combine the versatile, lightweight characteristics of polymers with the properties of nanomaterials. Polyethylene terephthalate glycol (PETG) is commonly used in polymer additive manufacturing due to its controllable transparency, hi ... Full text Cite

Mechanistic insights of nanofillers tuning polymer microstructures for enhanced separation performance of nanofiltration membrane

Journal Article Separation and Purification Technology · August 9, 2024 Nanomaterials, added in small quantities as “nanofillers,” have been shown to improve the performance of NF membranes in terms of mechanical properties, anti-fouling characteristics, selectivity, and transport. The goal of this work is to explore the mecha ... Full text Cite

Knowledge and Instance Mapping: architecture for premeditated interoperability of disparate data for materials.

Journal Article Scientific data · February 2024 Predicting and elucidating the impacts of materials on human health and the environment is an unending task that has taken on special significance in the context of nanomaterials research over the last two decades. The properties of materials in environmen ... Full text Cite

Quantifying mechanical abrasion of AgNP nanocomposites: influence of AgNP content on abrasion products and rate of microplastic production

Journal Article Environmental Science: Nano · January 1, 2024 Nanomaterials are used in polymer composites to enhance plastic products' properties. Silver nanoparticles (AgNPs) are added to composites for their antimicrobial and fungicidal properties. Polyethylene terephthalate glycol polymer (PETG) AgNP composite te ... Full text Cite

Extracellular Vesicles and Bacteriophages: New Directions in Environmental Biocolloid Research.

Journal Article Environ Sci Technol · November 7, 2023 There is a long-standing appreciation among environmental engineers and scientists regarding the importance of biologically derived colloidal particles and their environmental fate. This interest has been recently renewed in considering bacteriophages and ... Full text Link to item Cite

Characterizing the Transport and Surface Affinity of Extracellular Vesicles Isolated from Yeast and Bacteria in Well-Characterized Porous Media.

Journal Article Environ Sci Technol · September 5, 2023 Extracellular vesicles (EVs) are membrane-bounded, nanosized particles, produced and secreted by all biological cell types. EVs are ubiquitous in the environment, operating in various roles including intercellular communication and plant immune modulation. ... Full text Link to item Cite

Comparative electrokinetic properties of extracellular vesicles produced by yeast and bacteria.

Journal Article Colloids Surf B Biointerfaces · May 2023 Extracellular vesicles (EVs) are nano-sized, biocolloidal proteoliposomes that have been shown to be produced by all cell types studied to date and are ubiquitous in the environment. Extensive literature on colloidal particles has demonstrated the implicat ... Full text Link to item Cite

Metadata stewardship in nanosafety research: learning from the past, preparing for an “on-the-fly” FAIR future

Journal Article Frontiers in Physics · January 1, 2023 Introduction: Significant progress has been made in terms of best practice in research data management for nanosafety. Some of the underlying approaches to date are, however, overly focussed on the needs of specific research projects or aligned to a single ... Full text Cite

Investigating and Modeling the Regulation of Extracellular Antibiotic Resistance Gene Bioavailability by Naturally Occurring Nanoparticles.

Journal Article Environmental science & technology · November 2022 Extracellular antibiotic resistance genes (eARGs) are widespread in the environment and can genetically transform bacteria. This work examined the role of environmentally relevant nanoparticles (NPs) in regulating eARG bioavailability. eARGs extracted from ... Full text Cite

Predicting emerging chemical content in consumer products using machine learning.

Journal Article The Science of the total environment · August 2022 Chemical ingredients in consumer products are continually changing. To understand our exposure to chemicals and their consequent risk, we need to know their concentrations in products, or chemical weight fractions. Unfortunately, manufacturers rarely repor ... Full text Cite

Relationship between Atomic Force Microscopy and Centrifugation Measurements for Dust Fractions Implicated in Solar Panel Soiling.

Journal Article Environmental science & technology · July 2022 This work tests the reliability of a simple, rapid centrifugal technique to estimate the removal force necessary to detach common airborne particles from the surface of a photovoltaic panel. Previously, we have used atomic force microscopy (AFM) to obtain ... Full text Cite

Study on the mechanisms for the influence of nanomaterials on the separation performance of nanocomposite membrane from a modeling perspective

Journal Article Desalination · June 15, 2022 An understanding of how nanomaterials, serving as “nanofillers” in nanocomposite membranes, affect membrane performance is limited. This study investigates the mechanisms by which nanomaterials affect membrane performance from a paired modeling and experim ... Full text Cite

Exploring the design implications of bacteriophages in mixed suspensions by considering attachment and break-up.

Journal Article Water research · June 2022 The validity and usefulness of implementing bacteriophages into water treatment systems as agents of targeted bacterial inactivation is yet to be determined. While some concerns are still more purely biological in nature other concerns are still chiefly ro ... Full text Cite

Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate

Journal Article Process Safety and Environmental Protection · May 1, 2022 Pre-concentration and separation processes of Rare Earth Elements (REEs) were investigated in terms of several factors. Nitric acid leachate of e-waste was first pre-treated by increasing pH and filtering through microfiltration. For pre-concentration, pre ... Full text Cite

A holistic approach for the recovery of rare earth elements and scandium from secondary sources under a circular economy framework - A review.

Journal Article Chemosphere · April 2022 Limited natural resources and a continuous increase in the demand for modern technological products, is creating a demand and supply gap for rare earth elements (REEs) and Sc. There is therefore a need to adopt the sustainable approach of the circular econ ... Full text Cite

Separation of rare earth elements from mixed-metal feedstocks by micelle enhanced ultrafiltration with sodium dodecyl sulfate.

Journal Article Environmental technology · March 2022 Micelle enhanced ultrafiltration (MEUF) is a surfactant-based membrane separation process that may be used to separate target ions from mixed metal aqueous solutions, such as leachates of coal ash and other geological wastewaters. The ability of MEUF to se ... Full text Cite

From bottle to microplastics: Can we estimate how our plastic products are breaking down?

Journal Article The Science of the total environment · March 2022 Microplastics (MPs) have become an emerging new pollutant of rising concern due to the exponential growth of plastics in consumer products. Most MP and nanoplastic pollution comes from the fragmentation of plastics through mechanical stress, chemical react ... Full text Cite

Process optimization for acidic leaching of rare earth elements (REE) from waste electrical and electronic equipment (WEEE).

Journal Article Environmental science and pollution research international · January 2022 E-waste (EW) from discarded electrical and electronic devices is a potential source of rare earth elements (REEs) that might be recovered from urban and industrial wastes. REEs are essential raw materials for emerging and high technologies. China currently ... Full text Cite

In Vivo Effects of Silver Nanoparticles on Development, Behavior, and Mitochondrial Function are Altered by Genetic Defects in Mitochondrial Dynamics.

Journal Article Environmental science & technology · January 2022 Silver nanoparticles (AgNPs) are extensively used in consumer products and biomedical applications, thus guaranteeing both environmental and human exposures. Despite extensive research addressing AgNP safety, there are still major knowledge gaps regarding ... Full text Cite

Persistence and Environmental Relevance of Extracellular Antibiotic Resistance Genes: Regulation by Nanoparticle Association

Journal Article Environmental Engineering Science · December 1, 2021 Fate of extracellular antibiotic resistance genes (eARGs) - which are widespread in various environments - is dependent on gene persistence. This work examined the previously unconsidered role of environmentally relevant nanoparticles (NPs) in regulating e ... Full text Cite

Impacts of ingested MWCNT-Embedded nanocomposites in Japanese medaka (Oryzias latipes).

Journal Article Nanotoxicology · December 2021 Polymer nanocomposites combine the versatile, lightweight characteristics of polymers with the properties of nanomaterials. Polyethylene terephthalate glycol (PETG) is commonly used in polymer additive manufacturing due to its controllable transparency, hi ... Full text Cite

Effect of solution chemistry on filtration performances and fouling potential of membrane processes for rare earth element recovery from red mud.

Journal Article Environmental science and pollution research international · November 2021 Rare earth elements or REEs are a vital and irreplaceable part of our modern technological and digital industries. Among the REEs that are the most critical to be recovered are Ce, La, and particularly, Nd, and Y, due to high demand and at a potential futu ... Full text Cite

Lack of Detectable Direct Effects of Silver and Silver Nanoparticles on Mitochondria in Mouse Hepatocytes.

Journal Article Environmental science & technology · August 2021 Silver nanoparticles (AgNPs) are well-proven antimicrobial nanomaterials, yet little is elucidated regarding the mechanism underlying cytotoxicity induced by these nanoparticles. Here, we tested the hypothesis that mitochondria are primary intracellular ta ... Full text Cite

Quantifying Mechanical Abrasion of MWCNT Nanocomposites Used in 3D Printing: Influence of CNT Content on Abrasion Products and Rate of Microplastic Production.

Journal Article Environmental science & technology · August 2021 Manufactured nanomaterials (MNMs) are incorporated as "nanofillers" into consumer products to enhance properties of interest. Multiwalled carbon nanotubes (MWCNTs) are known for their unique properties and have many applications in polymers. However, the r ... Full text Cite

Comprehensive characterization of secondary sources originating from Turkey in terms of rare earth elements and scandium

Journal Article Science of the Total Environment · July 10, 2021 REEs are essential materials for modern technology due to their unmatched physical and chemical properties. This paper reviews the potential and types of rare earth elements (REE) in 32 different secondary sources that contain water, wastewater, and slime/ ... Full text Cite

The NanoInformatics Knowledge Commons: Capturing spatial and temporal nanomaterial transformations in diverse systems.

Journal Article NanoImpact · July 2021 The empirical necessity for integrating informatics throughout the experimental process has become a focal point of the nano-community as we work in parallel to converge efforts for making nano-data reproducible and accessible. The NanoInformatics Knowledg ... Full text Cite

Bridging international approaches on nanoEHS.

Journal Article Nature nanotechnology · June 2021 Full text Cite

Microbial vesicle-mediated communication: convergence to understand interactions within and between domains of life.

Journal Article Environ Sci Process Impacts · May 26, 2021 All cells produce extracellular vesicles (EVs). These biological packages contain complex mixtures of molecular cargo and have a variety of functions, including interkingdom communication. Recent discoveries highlight the roles microbial EVs may play in th ... Full text Link to item Cite

Nanoplastics are neither microplastics nor engineered nanoparticles.

Journal Article Nature nanotechnology · May 2021 Increasing concern and research on the subject of plastic pollution has engaged the community of scientists working on the environmental health and safety of nanomaterials. While many of the methods developed in nano environment, health and safety work hav ... Full text Cite

Nanoparticles as vectors for antibiotic resistance: The association of silica nanoparticles with environmentally relevant extracellular antibiotic resistance genes.

Journal Article The Science of the total environment · March 2021 A relevant but yet unconsidered subset of particles that may alter the fate of extracellular antibiotic resistance genes (eARGs) are nano-scale particles (NPs), which are ubiquitous in natural environments and have unique properties. In this study, sorptio ... Full text Cite

Discovery of Welcome Biopolymers in Surface Water: Improvements in Drinking Water Production.

Journal Article Environmental science & technology · February 2021 The presence of biopolymers in surface waters and their significance for potable water supply have received little attention previously owing to their low concentrations. In this paper, we present the results of an extensive study that has investigated the ... Full text Cite

Effect of Dust Composition on the Reversibility of Photovoltaic Panel Soiling.

Journal Article Environmental science & technology · February 2021 Eight types of common airborne particles were used to investigate whether the composition of dust influences its soiling potential on photovoltaic panels. Chosen model particles were roughly spherical, 10-30 μm in diameter to minimize the differences in si ... Full text Cite

Pairing electrochemical impedance spectroscopy with conducting membranes for the in situ characterization of membrane fouling

Journal Article Journal of Membrane Science · January 15, 2021 Protein fouling within a polymeric microfiltration membrane was characterized in situ and in real time with non-Faradaic electrochemical impedance spectroscopy (EIS). The polymeric membrane was prepared with a conductive gold coating, allowing the membrane ... Full text Cite

The role of carboxylated cellulose nanocrystals placement in the performance of thin-film composite (TFC) membrane

Journal Article Journal of Membrane Science · January 1, 2021 Nanomaterials have been used in the formulation of thin-film composite (TFC) membranes to improve membrane performance and reduce environmental impact. Here we investigate the role of nanomaterial placement in the active layer versus the support layer of t ... Full text Cite

MESOCOSM: A mesocosm database management system for environmental nanosafety.

Journal Article NanoImpact · January 2021 Engineered nanomaterials (ENMs) are intentionally designed and produced by humans to revolutionize the manufacturing sector, such as electronic goods, paints, tires, clothes, cosmetic products, and biomedicine. With the spread of these ENMs in our daily li ... Full text Cite

Exposure and Possible Risks of Engineered Nanomaterials in the Environment—Current Knowledge and Directions for the Future

Journal Article Reviews of Geophysics · December 1, 2020 The consequences that engineered nanomaterials (ENMs) may cause in the environment have been under investigation for more than 15 years. Hundreds of millions of euros/dollars have been invested into safety issues of ENMs, and much progress has been made in ... Full text Cite

Comparative impact of SiO2 and TiO2 nanofillers on the performance of thin-film nanocomposite membranes

Journal Article Journal of Applied Polymer Science · November 20, 2020 Nanoparticle (NP) additions can substantially improve the performance of reverse osmosis and nanofiltration polyamide (PA) membranes. However, the relative impacts of leading additives are poorly understood. In this study, we compare the effects of TiO2 an ... Full text Cite

Thermal Activation of Peracetic Acid in Aquatic Solution: The Mechanism and Application to Degrade Sulfamethoxazole.

Journal Article Environmental science & technology · November 2020 Chemical oxidation using peracetic acid (PAA) can be enhanced by activation with the formation of reactive species such as organic radicals (R-O•) and HO•. Thermal activation is an alternative way for PAA activation, which was first a ... Full text Cite

The shape and speciation of Ag nanoparticles drive their impacts on organisms in a lotic ecosystem

Journal Article Environmental Science: Nano · October 1, 2020 Silver nanomaterials with different shapes (spheres, plates, wires, rods, cubes) are valued by industries and scientists for their shape-dependent properties which make them useful for diverse applications. In a safer-by-design perspective, controlling the ... Full text Cite

Risk Governance of Emerging Technologies Demonstrated in Terms of its Applicability to Nanomaterials.

Journal Article Small (Weinheim an der Bergstrasse, Germany) · September 2020 Nanotechnologies have reached maturity and market penetration that require nano-specific changes in legislation and harmonization among legislation domains, such as the amendments to REACH for nanomaterials (NMs) which came into force in 2020. Thus, an ass ... Full text Cite

Thin film nanocomposite nanofiltration hollow fiber membrane fabrication and characterization by electrochemical impedance spectroscopy

Journal Article Polymer Bulletin · July 1, 2020 Nano-TiO2 nanoparticles were incorporated into thin film nanocomposites (TFN) formed on hollow fiber support membranes composed of a blend of polysulfone and multi-walled carbon nanotubes. Three different TiO2 nanoparticles (0.01%, 0.05% and 0.2% w/v) in t ... Full text Cite

Nanoparticle affinity for natural soils: a functional assay for determining particle attachment efficiency in complex systems

Journal Article Environmental Science: Nano · June 1, 2020 Few standardized methods and reference systems have been established for evaluating the behavior of engineered nanomaterials in complex media like natural soils. In this study, a working method for a functional assay to determine the affinity of nanopartic ... Full text Cite

Chemical cleaning of algae-fouled ultrafiltration (UF) membrane by sodium hypochlorite (NaClO): Characterization of membrane and formation of halogenated by-products

Journal Article Journal of Membrane Science · March 15, 2020 This paper presents an investigation of the variation in membrane characteristics and formation of halogenated by-products during the off-line chemical cleaning of algae-fouled ultrafiltration (UF) membrane by NaClO solution. The chemical treatment led to ... Full text Cite

Modeling bacteriophage-induced inactivation of Escherichia coli utilizing particle aggregation kinetics.

Journal Article Water research · March 2020 Targeted inactivation of bacteria using bacteriophages has been proposed in applications ranging from bioengineering and biofuel production to medical treatments. The ability to differentiate between desirable and undesirable organisms, such as in targetin ... Full text Cite

Delivery, Fate, and Mobility of Silver Nanoparticles in Citrus Trees.

Journal Article ACS nano · March 2020 Crop disease control is crucial for the sustainable development of agriculture, with recent advances in nanotechnology offering a promising solution to this pressing problem. However, the efficacy of nanoparticle (NP) delivery methods has not been fully ex ... Full text Cite

Differential Reactivity of Copper- and Gold-Based Nanomaterials Controls Their Seasonal Biogeochemical Cycling and Fate in a Freshwater Wetland Mesocosm.

Journal Article Environmental science & technology · February 2020 Reliable predictions of the environmental fate and risk of engineered nanomaterials (ENMs) require a better understanding of ENM reactivity in complex, biologically active systems for chronic low-concentration exposure scenarios. Here, simulated freshwater ... Full text Cite

Caveats to the use of MTT, neutral red, Hoechst and Resazurin to measure silver nanoparticle cytotoxicity.

Journal Article Chemico-biological interactions · January 2020 The extensive use of silver nanoparticles (AgNPs) in manufactured products will inevitably increase environmental exposure, highlighting the importance of accurate toxicity assessments. A frequent strategy to estimate AgNP cytotoxicity is to use absorbance ... Full text Cite

Application of Cobalt/Peracetic Acid to Degrade Sulfamethoxazole at Neutral Condition: Efficiency and Mechanisms.

Journal Article Environmental science & technology · January 2020 An advanced oxidation process of combining cobalt and peracetic acid (Co/PAA) was developed to degrade sulfamethoxazole (SMX) in this study. The formed acetylperoxy radical (CH3CO3•) through the activation of PAA by Co (Co< ... Full text Cite

Groundwater Chemistry Has a Greater Influence on the Mobility of Nanoparticles Used for Remediation than the Chemical Heterogeneity of Aquifer Media.

Journal Article Environmental science & technology · January 2020 The application of nanoscale zerovalent iron (nano-ZVI) particles for groundwater remediation has spurred research into the influence of the collector heterogeneity on the nano-ZVI mobility. The chemical heterogeneity of surfaces within aquifer media affec ... Full text Cite

Harmonizing across environmental nanomaterial testing media for increased comparability of nanomaterial datasets

Journal Article Environmental Science: Nano · January 1, 2020 The chemical composition and properties of environmental media determine nanomaterial (NM) transport, fate, biouptake, and organism response. To compare and interpret experimental data, it is essential that sufficient context be provided for describing the ... Full text Cite

NanoSolveIT Project: Driving nanoinformatics research to develop innovative and integrated tools for in silico nanosafety assessment.

Journal Article Computational and structural biotechnology journal · January 2020 Nanotechnology has enabled the discovery of a multitude of novel materials exhibiting unique physicochemical (PChem) properties compared to their bulk analogues. These properties have led to a rapidly increasing range of commercial applications; this, howe ... Full text Cite

Impact of ZnO and ZnS nanoparticles in sewage sludge-amended soil on bacteria, plant and invertebrates.

Journal Article Chemosphere · December 2019 The effect of zinc oxide nanoparticles (ZnO NPs) and zinc sulfide nanoparticles (ZnS NPs) on the toxicity of sewage sludges in sewage sludge-amended soils was investigated with respect to plant- (Lepidium sativum) and soil- (Folsomia candida) species. The ... Full text Cite

Enhanced denitrifying phosphorus removal and mass balance in a worm reactor.

Journal Article Chemosphere · July 2019 Phosphorus release is one of the disadvantages during worm predation, which has an adverse effect on wastewater treatment. In order to investigate and reveal the effects and mechanisms of worm predation on phosphorus transformation, batch experiments were ... Full text Cite

Comparative study on the pretreatment of algae-laden water by UV/persulfate, UV/chlorine, and UV/H2O2: Variation of characteristics and alleviation of ultrafiltration membrane fouling.

Journal Article Water research · July 2019 In this study, ultraviolet based advanced oxidation processes (UV-AOPs) including UV/persulfate (UV/PS), UV/chlorine, and UV/H2O2 were employed to alleviate ultrafiltration membrane fouling during the treatment of algae-laden water. T ... Full text Cite

Chlorpyrifos degradation via photoreactive TiO2 nanoparticles: Assessing the impact of a multi-component degradation scenario.

Journal Article Journal of hazardous materials · June 2019 High concentrations of pesticides enter surface waters following agricultural application, raising environmental and human health concerns. The use of photoreactive nanoparticles has shown promise for contaminant degradation and surface water remediation. ... Full text Cite

A novel approach for fouling mitigation in anaerobic-anoxic-oxic membrane bioreactor (A2O-MBR) by integrating worm predation.

Journal Article Environment international · June 2019 Membrane fouling is one of the biggest challenges in the widespread application of membrane bioreactors. In this study, a combined system of anaerobic-anoxic-oxic membrane bioreactor (A2O-MBR) and worm reactor (WR) was established for fouling co ... Full text Cite

Selective Recovery of Rare Earth Elements from Coal Fly Ash Leachates Using Liquid Membrane Processes.

Journal Article Environmental science & technology · April 2019 Coal combustion residues and other geological waste materials have been proposed as a resource for rare earth elements (REEs, herein defined as the 14 stable lanthanides, yttrium, and scandium). The extraction of REEs from residues often generate acidified ... Full text Cite

Formulation and Validation of a Functional Assay-Driven Model of Nanoparticle Aquatic Transport.

Journal Article Environmental science & technology · March 2019 Here, we present a model for the prediction of nanoparticle fate in aquatic environments, parametrized using functional assays that take into account conditions of the environmental media and nanoparticle properties. The model was used to explore scenarios ... Full text Cite

XPS study of size effects of Fe3O4 nanoparticles on crosslinking degree of magnetic TFN membrane

Journal Article Polymer Testing · February 1, 2019 The control of thin film nanocomposite (TFN) membranes cross-linking degree is an important factor to design new membranes and optimizing permeation characteristics. The Fe3O4 nanoparticle's based TFN membranes due to potentially added magnetic responsive ... Full text Cite

Contribution of mesocosm testing to a single-step and exposure-driven environmental risk assessment of engineered nanomaterials

Journal Article NanoImpact · January 1, 2019 Environmental risk assessment of nanomaterials generally relies on a decision-tree based strategy which provides guidance and protocols for the determination of a collection of hazard end-points. Mesocosm testing is based on a different approach. This meth ... Full text Cite

Recovery of rare earth elements from coal fly ash leachates by supported liquid membranes

Conference 36th Annual International Pittsburgh Coal Conference: Clean Coal-Based Energy/Fuels and the Environment, PCC 2019 · January 1, 2019 • Extraction from coal ash: Produces a highly heterogeneous liquid feedstock (impurities of Al, Si, Fe, Ca) • REE separations via supported liquid membranes: o 103- to 105-fold selectivity for REEs o preference for heavy REEs • Product purity depends on Fe ... Cite

Tailoring the Core-Satellite Nanoassembly Architectures by Tuning Internanoparticle Electrostatic Interactions.

Journal Article Langmuir : the ACS journal of surfaces and colloids · December 2018 The use of plasmonic nanoplatforms has received increasing interest in a wide variety of fields ranging from theranostics to environmental sensing to plant biology. In particular, the development of plasmonic nanoparticles into ordered nanoclusters has bee ... Full text Cite

Gold nanoparticle biodissolution by a freshwater macrophyte and its associated microbiome.

Journal Article Nature nanotechnology · November 2018 Predicting nanoparticle fate in aquatic environments requires mimicking of ecosystem complexity to observe the geochemical processes affecting their behaviour. Here, 12 nm Au nanoparticles were added weekly to large-scale freshwater wetland mesocosms. Afte ... Full text Cite

Application of nanofiltration for Rare Earth Elements recovery from coal fly ash leachate: Performance and cost evaluation

Journal Article Chemical Engineering Journal · October 1, 2018 This work evaluated nanofiltration (NF) as a potential step in the recovery process of Rare Earth Elements (REEs) from leachates of coal combustion fly ashes. A pre-treatment step, by pH adjustment and microfiltration (MF), has been studied to separate REE ... Full text Cite

Incorporation of Cellulose Nanocrystals (CNCs) into the Polyamide Layer of Thin-Film Composite (TFC) Nanofiltration Membranes for Enhanced Separation Performance and Antifouling Properties.

Journal Article Environmental science & technology · October 2018 To achieve greater separation performance and antifouling properties in a thin-film composite (TFC) nanofiltration membrane, cellulose nanocrystals (CNCs) were incorporated into the polyamide layer of a TFC membrane for the first time. The results of Fouri ... Full text Cite

Engineered nanoparticles interact with nutrients to intensify eutrophication in a wetland ecosystem experiment.

Journal Article Ecological applications : a publication of the Ecological Society of America · September 2018 Despite the rapid rise in diversity and quantities of engineered nanomaterials produced, the impacts of these emerging contaminants on the structure and function of ecosystems have received little attention from ecologists. Moreover, little is known about ... Full text Cite

Size-Based Differential Transport, Uptake, and Mass Distribution of Ceria (CeO2) Nanoparticles in Wetland Mesocosms.

Journal Article Environmental science & technology · September 2018 Trace metals associated with nanoparticles are known to possess reactivities that are different from their larger-size counterparts. However, the relative importance of small relative to large particles for the overall distribution and biouptake of these m ... Full text Cite

Modeling magneto-mechanical behavior of Fe3O4 nanoparticle/polyamide nanocomposite membrane in an external magnetic field

Journal Article Journal of Composite Materials · May 1, 2018 The magnetic response of a polyamide nanocomposite membrane under applying a magnetic field has been modeled to evaluate elastic deformation order of magnitude. A PA-Fe3O4 nanocomposite membrane is considered to be modeled under influence of volume plane s ... Full text Cite

Comparative Persistence of Engineered Nanoparticles in a Complex Aquatic Ecosystem.

Journal Article Environmental science & technology · April 2018 During nanoparticle environmental exposure, presence in the water column is expected to dominate long distance transport as well as initial aquatic organism exposure. Much work has been done to understand potential ecological and toxicological effects of t ... Full text Cite

State of science in nano and environment

Journal Article NanoImpact · April 1, 2018 Full text Cite

Stress Responses of Aquatic Plants to Silver Nanoparticles.

Journal Article Environmental science & technology · March 2018 Silver nanoparticles (AgNPs) are increasingly used in consumer products, biotechnology, and medicine, and are released into aquatic ecosystems through wastewater discharge. This study investigated the phytotoxicity of AgNPs to aquatic plants, Egeria densa ... Full text Cite

Intercalation of rigid molecules between carbon nanotubes for adsorption enhancement of typical pharmaceuticals

Journal Article Chemical Engineering Journal · January 15, 2018 A nucleophilic aromatic substitution reaction was proposed to synthesize porous carbon nanotubes (CNTs) to avoid their aggregation in solution. Hydroxylated carbon nanotubes (CNTs-OH) were reacted with different concentrations of rigid decafluorobiphenyl ( ... Full text Cite

Uptake, tissue distribution, and toxicity of polystyrene nanoparticles in developing zebrafish (Danio rerio).

Journal Article Aquat Toxicol · January 2018 Plastic pollution is a critical environmental concern and comprises the majority of anthropogenic debris in the ocean, including macro, micro, and likely nanoscale (less than 100nm in at least one dimension) plastic particles. While the toxicity of macropl ... Full text Link to item Cite

Hydrophilic and strengthened 3D reduced graphene oxide/nano-Fe3O4 hybrid hydrogel for enhanced adsorption and catalytic oxidation of typical pharmaceuticals

Journal Article Environmental Science: Nano · January 1, 2018 A simple method for the preparation of a three-dimensional (3D) reduced graphene oxide/Fe3O4 (3D-rGO/Fe3O4) hybrid hydrogel was developed via the reduction of graphene oxide by ferrous ions and in situ simultaneous generation of tunable Fe3O4 nanoparticles ... Full text Cite

The NSF-EPA Centers for the Environmental Implications of Nanotechnology: What They Taught Us

Chapter · January 1, 2018 The NSF/EPA-supported Centers for the Environmental Implications of Nanotechnology (CEINs) offer an example of the critical role that federal governments played in establishing the infrastructure and expertise required to better understand the interactions ... Full text Cite

Measuring Nanoparticle Attachment Efficiency in Complex Systems.

Journal Article Environmental science & technology · November 2017 As process-based environmental fate and transport models for engineered nanoparticles are developed, there is a need for relevant and reliable measures of nanoparticle behavior. The affinity of nanoparticles for various surfaces (α) is one such measure. Me ... Full text Cite

Modeling the Concentration of Volatile and Semivolatile Contaminants in Direct Contact Membrane Distillation (DCMD) Product Water.

Journal Article Environmental science & technology · November 2017 Direct contact membrane distillation (DCMD) is an emerging water treatment technology that has high salt rejection; however, its commercialization potential for applications such as seawater desalination or industrial wastewater reuse may be limited by low ... Full text Cite

Mechanistic Insights from Discrete Molecular Dynamics Simulations of Pesticide-Nanoparticle Interactions.

Journal Article Environmental science & technology · August 2017 Nanoscale particles have the potential to modulate the transport, lifetimes, and ultimate uptake of pesticides that may otherwise be bound to agricultural soils. Engineered nanoparticles provide a unique platform for studying these interactions. In this st ... Full text Cite

Impact of Sodium Humate Coating on Collector Surfaces on Deposition of Polymer-Coated Nanoiron Particles.

Journal Article Environmental science & technology · August 2017 The affinity between nanoscale zerovalent iron (nano-ZVI) and mineral surfaces hinders its mobility, and hence its delivery into contaminated aquifers. We have tested the hypothesis that the attachment of poly(acrylic acid)-coated nano-ZVI (PAA-nano-ZVI) t ... Full text Cite

Cellulose nanocrystal zero-valent iron nanocomposites for groundwater remediation.

Journal Article Environmental science. Nano · June 2017 Zero-valent iron nanoparticles (nano-ZVIs) have been widely studied for in situ remediation of groundwater and other environmental matrices. Nano-ZVI particle mobility and reactivity are still the main impediments in achieving efficient in situ Full text Cite

Uptake and Distribution of Silver in the Aquatic Plant Landoltia punctata (Duckweed) Exposed to Silver and Silver Sulfide Nanoparticles.

Journal Article Environmental science & technology · May 2017 Aquatic ecosystems are expected to receive Ag0 and Ag2S nanoparticles (NPs) through anthropogenic waste streams. The speciation of silver in Ag-NPs affects their fate in ecosystems, but its influence on interactions with aquatic plant ... Full text Cite

Influence of Aqueous Inorganic Anions on the Reactivity of Nanoparticles in TiO2 Photocatalysis.

Journal Article Langmuir : the ACS journal of surfaces and colloids · March 2017 The influence of inorganic anions on the photoreactivity and aggregation of titanium dioxide nanoparticles (NPs) was assessed by dosing carbonate, chloride, nitrate, phosphate, and sulfate as potassium salts at multiple concentrations. NP stability was mon ... Full text Cite

Cation-Inhibited Transport of Graphene Oxide Nanomaterials in Saturated Porous Media: The Hofmeister Effects.

Journal Article Environmental science & technology · January 2017 Transport of negatively charged nanoparticles in porous media is largely affected by cations. To date, little is known about how cations of the same valence may affect nanoparticle transport differently. We observed that the effects of cations on the trans ... Full text Cite

Nanotechnology for sustainable food production: promising opportunities and scientific challenges

Journal Article Environmental Science: Nano · January 1, 2017 The agro-ecosystem is under enormous pressure due to rapid population growth, increasing global food demand, increasing fresh water withdrawals and energy consumption, excessive food waste, inefficient use of agrochemicals, environmental degradation and cl ... Full text Cite

Comparison of Hydrophilicity and Mechanical Properties of Nanocomposite Membranes with Cellulose Nanocrystals and Carbon Nanotubes.

Journal Article Environmental science & technology · January 2017 The inherent properties of hydrophilicity and mechanical strength of cellulose nanocrystals (CNCs) make them a possible alternative to carbon nanotubes (CNTs) that may present fewer objections to application water-treatment membranes. In this work, the hyd ... Full text Cite

Decreased Uptake and Enhanced Mitochondrial Protection Underlie Reduced Toxicity of Nanoceria in Human Monocyte-Derived Macrophages.

Journal Article Journal of biomedical nanotechnology · December 2016 Cerium dioxide nanoparticles (nanoceria), currently used as catalysts including additives to diesel fuel, also present potential as a novel therapeutic agent for disorders involving oxidative stress. However, little is known about the effects of nanoceria ... Full text Cite

Silver nanoparticle toxicity is related to coating materials and disruption of sodium concentration regulation.

Journal Article Nanotoxicology · November 2016 Silver nanoparticles (AgNPs) have been increasingly commercialized and their release into the environment is imminent. Toxicity of AgNP has been studied with a wide spectrum of organisms, yet the mechanism of toxicity remains largely unknown. This study sy ... Full text Open Access Cite

Improved chlorine tolerance of a polyvinyl pyrrolidone-polysulfone membrane enabled by carboxylated carbon nanotubes.

Journal Article Water research · November 2016 Chemical cleaning of membranes may be limited by the tolerance of some polymeric membranes to chlorine. In this work we show that modification of a polyvinyl pyrrolidone-polysulfone (PVP-PSF) membrane with carboxylated carbon nanotubes (CNTs) leads to grea ... Full text Cite

Transport of cerium oxide nanoparticles in saturated silica media: influences of operational parameters and aqueous chemical conditions.

Journal Article Scientific reports · October 2016 This paper aimed to investigate the influences of operational parameters and aqueous chemical conditions on transport behaviors of cerium oxides nanoparticles (CeO2-NPs) in saturated silica media. Results indicated that increasing rates of attac ... Full text Cite

A review of the environmental implications of in situ remediation by nanoscale zero valent iron (nZVI): Behavior, transport and impacts on microbial communities.

Journal Article The Science of the total environment · September 2016 The increasing use of strategies incorporating nanoscale zero valent iron (nZVI) for soil and groundwater in situ remediation is raising some concerns regarding the potential adverse effects nZVI could have on indigenous microbial communities and ecosystem ... Full text Cite

Silver toxicity across salinity gradients: the role of dissolved silver chloride species (AgCl x ) in Atlantic killifish (Fundulus heteroclitus) and medaka (Oryzias latipes) early life-stage toxicity.

Journal Article Ecotoxicology (London, England) · August 2016 The influence of salinity on Ag toxicity was investigated in Atlantic killifish (Fundulus heteroclitus) early life-stages. Embryo mortality was significantly reduced as salinity increased and Ag(+) was converted to AgCl(solid). However, as salinity continu ... Full text Open Access Cite

Nanoparticle Surface Affinity as a Predictor of Trophic Transfer.

Journal Article Environmental science & technology · July 2016 Nanoscale materials, whether natural, engineered, or incidental, are increasingly acknowledged as important components in large, environmental systems with potential implications for environmental impact and human health. Mathematical models are a useful t ... Full text Cite

Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals

Journal Article Chemical Engineering Journal · June 15, 2016 A simple and convenient method was used to prepare novel granular carbon nanotubes (CNTs) for enhanced adsorption of pharmaceuticals. By heating CNTs powder at 450 °C in air, followed by filtration, the obtained granular adsorbent exhibited high surface ar ... Full text Cite

Considerations of Environmentally Relevant Test Conditions for Improved Evaluation of Ecological Hazards of Engineered Nanomaterials.

Journal Article Environmental science & technology · June 2016 Engineered nanomaterials (ENMs) are increasingly entering the environment with uncertain consequences including potential ecological effects. Various research communities view differently whether ecotoxicological testing of ENMs should be conducted using e ... Full text Cite

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling.

Journal Article Journal of hazardous materials · March 2016 Ball milling was used to prepare two ultrafine magnetic biochar/Fe3O4 and activated carbon (AC)/Fe3O4 hybrid materials targeted for use in pharmaceutical removal by adsorption and mechanochemical degradation of pharmaceutical compounds. Both hybrid adsorbe ... Full text Cite

Barriers, pathways and processes for uptake, translocation and accumulation of nanomaterials in plants--Critical review.

Journal Article Nanotoxicology · January 2016 Uptake, transport and toxicity of engineered nanomaterials (ENMs) into plant cells are complex processes that are currently still not well understood. Parts of this problem are the multifaceted plant anatomy, and analytical challenges to visualize and quan ... Full text Cite

Visualization tool for correlating nanomaterial properties and biological responses in zebrafish

Journal Article Environmental Science: Nano · January 1, 2016 The complexity of engineered nanomaterials with regard to their structure and system-dependent properties, and limits of instrumentation to fully characterize nanomaterials in aqueous suspensions or biological media make it difficult to understand how mate ... Full text Cite

Modelling engineered nanoparticle fate in aquatic systems: Application of attachment rate

Conference International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM · January 1, 2016 Engineered nanoparticles (ENPs) are currently being used in a variety of commercial products and processes, however the material characteristics employed in standard regulatory fate models (e.g. FOCUS surface and ground water) do not fully capture nano-spe ... Cite

A functional assay-based strategy for nanomaterial risk forecasting.

Journal Article The Science of the total environment · December 2015 The study of nanomaterial impacts on environment, health and safety (nanoEHS) has been largely predicated on the assumption that exposure and hazard can be predicted from physical-chemical properties of nanomaterials. This approach is rooted in the view th ... Full text Cite

Chlorination of polyvinyl pyrrolidone-polysulfone membranes: Organic compound release, byproduct formation, and changes in membrane properties

Journal Article Journal of Membrane Science · September 1, 2015 In this work, the release of organic compounds, the variations of membrane properties and the formation of toxic byproducts during chlorine treatment of polyvinyl pyrrolidone-polysulfone (PVP-PSF) membranes were investigated. Chlorine treatment decreased b ... Full text Cite

Heteroaggregation, transformation and fate of CeO₂ nanoparticles in wastewater treatment.

Journal Article Environmental pollution (Barking, Essex : 1987) · August 2015 Wastewater Treatment Plants (WWTPs) are a key pathway by which nanoparticles (NPs) enter the environment following release from NP-enabled products. This work considers the fate and exposure of CeO2 NPs in WWTPs in a two-step process of heteroaggregation w ... Full text Cite

Enhanced Biogas Production from Nanoscale Zero Valent Iron-Amended Anaerobic Bioreactors.

Journal Article Environmental engineering science · August 2015 Addition of nanoscale zero valent iron (NZVI) to anaerobic batch reactors to enhance methanogenic activity is described. Two NZVI systems were tested: a commercially available NZVI (cNZVI) slurry and a freshly synthesized NZVI (sNZVI) suspension that was p ... Full text Cite

Experimental measurement and modelling of reactive species generation in TiO2 nanoparticle photocatalysis

Journal Article Chemical Engineering Journal · July 1, 2015 The generation of reactive species in titanium dioxide (TiO2) nanoparticle photocatalysis was assessed in a laboratory scale setup, in which P25 Aeroxide TiO2 suspensions were photoactivated by means of UV-A radiation. Photogenerated holes and hydroxyl rad ... Full text Cite

Speciation Matters: Bioavailability of Silver and Silver Sulfide Nanoparticles to Alfalfa (Medicago sativa).

Journal Article Environmental science & technology · July 2015 Terrestrial crops are directly exposed to silver nanoparticles (Ag-NPs) and their environmentally transformed analog silver sulfide nanoparticles (Ag2S-NPs) when wastewater treatment biosolids are applied as fertilizer to agricultural soils. This leads to ... Full text Cite

Cellulose nanomaterials in water treatment technologies.

Journal Article Environmental science & technology · May 2015 Cellulose nanomaterials are naturally occurring with unique structural, mechanical and optical properties. While the paper and packaging, automotive, personal care, construction, and textiles industries have recognized cellulose nanomaterials' potential, w ... Full text Cite

Monte Carlo simulations of the transformation and removal of Ag, TiO2, and ZnO nanoparticles in wastewater treatment and land application of biosolids.

Journal Article The Science of the total environment · April 2015 The use of nano-enabled materials in industry and consumer products is increasing rapidly and with it, the more imperative it becomes to understand the consequences of such materials entering the environment during production, use or disposal. The novel pr ... Full text Cite

Fabrication and characterization of hydroxylated and carboxylated multiwalled carbon nanotube/polyethersulfone (PES) nanocomposite hollow fiber membranes

Journal Article Desalination · March 2, 2015 Pilot scale studies were performed to investigate how CNTs might affect hollow fiber membrane (HF) resistance to stress. Further, this research explored how the addition of CNTs into membrane solutions affected trends associated with changes in conventiona ... Full text Cite

Removal of 2-MIB and geosmin using UV/persulfate: contributions of hydroxyl and sulfate radicals.

Journal Article Water research · February 2015 2-methylisoborneol (2-MIB) and geosmin are two odor-causing compounds that are difficult to remove and the cause of many consumer complaints. In this study, we assessed the degradation of 2-MIB and geosmin using a UV/persulfate process for the first time. ... Full text Cite

Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation.

Journal Article ACS applied materials & interfaces · February 2015 The development of a sustainable membrane surface based on chitosan/poly(acrylic acid) (CHI/PAA) multilayers suitable for applications in analytical separations is reported here. Bilayers are constructed on polyamide microfiltration membranes at a pH combi ... Full text Cite

Characterizing reactive oxygen generation and bacterial inactivation by a zerovalent iron-fullerene nano-composite device at neutral pH under UV-A illumination.

Journal Article Journal of hazardous materials · January 2015 A nano-composite device composed of nano-scale zerovalent iron (ZVI) and C60 fullerene aggregates (ZVI/nC60) was produced via a rapid nucleation method. The device was conceived to deliver reactive oxygen species (ROS) generated by photosensitization and/o ... Full text Cite

Nanotechnology, global development in the frame of environmental risk forecasting. A necessity of interdisciplinary researches

Journal Article Comptes Rendus - Geoscience · January 1, 2015 Interdisciplinarity is of first importance to evaluate the risks associated with nanotechnology. The reasons are that nanomaterials are very new materials that combine nano-sizes and new reactivities. The complexity comes from the very low concentrations o ... Full text Cite

Single-walled carbon nanotubes increase pandemic influenza A H1N1 virus infectivity of lung epithelial cells.

Journal Article Particle and fibre toxicology · December 2014 BackgroundAirborne exposure to nanomaterials from unintended occupational or environmental exposures or as a consequence of product use may lead to adverse health effects. Numerous studies have focused on single-walled carbon nanotubes (SWCNTs) an ... Full text Cite

Fate of single walled carbon nanotubes in wetland ecosystems

Journal Article Environmental Science: Nano · December 1, 2014 We report here the first studies addressing fate and transport of single walled carbon nanotubes (SWNTs) in aquatic mesocosms. The experimental design was structured to study the impact of nanomaterials within a tightly controlled and highly instrumented w ... Full text Cite

Aging of fullerene C₆₀ nanoparticle suspensions in the presence of microbes.

Journal Article Water research · November 2014 Despite the growing use of carbon nanomaterials in commercial applications, very little is known about the fate of these nanomaterials once they are released into the environment. The carbon-carbon bonding of spherical sp(2) hybridized fullerene (C60) form ... Full text Cite

Salinity-dependent silver nanoparticle uptake and transformation by Atlantic killifish (Fundulus heteroclitus) embryos.

Journal Article Nanotoxicology · August 2014 We assessed the biodistribution and in situ speciation of sub-lethal concentrations of citrate-coated silver nanoparticles and dissolved silver within Fundulus heteroclitus embryos. Using a thorough physico-chemical characterization, we studied the role of ... Full text Cite

Importance of heterogeneous aggregation for NP fate in natural and engineered systems.

Journal Article The Science of the total environment · July 2014 The growing interest in nanoparticles (NP) is inevitably translating into an increase of their emissions in the environment. On the other hand, the necessary knowledge about the fate and transport of these NPs in the environment remains limited. In particu ... Full text Cite

Transformation of pristine and citrate-functionalized CeO2 nanoparticles in a laboratory-scale activated sludge reactor.

Journal Article Environmental science & technology · July 2014 Engineered nanomaterials (ENMs) are used to enhance the properties of many manufactured products and technologies. Increased use of ENMs will inevitably lead to their release into the environment. An important route of exposure is through the waste stream, ... Full text Cite

An adaptable mesocosm platform for performing integrated assessments of nanomaterial risk in complex environmental systems.

Journal Article Scientific reports · July 2014 Physical-chemists, (micro)biologists, and ecologists need to conduct meaningful experiments to study the environmental risk of engineered nanomaterials with access to relevant mechanistic data across several spatial and temporal scales. Indoor aquatic meso ... Full text Cite

Special Issue Introduction: Environmental Nanomaterials

Journal Article Environmental Engineering Science · July 1, 2014 Full text Cite

Formation of Silver Nanoparticles in Visible Light-Illuminated Waters: Mechanism and Possible Impacts on the Persistence of AgNPs and Bacterial Lysis

Journal Article Environmental Engineering Science · July 1, 2014 A confluence of water and silver-containing products or compounds results in unintentional or intentional discharge of silver species (including silver nanoparticles [AgNPs], free or organic matter-bound Ag+, Ag-halides, or soluble Ag-complexes) into visib ... Full text Cite

Theory and Methodology for Determining Nanoparticle Affinity for Heteroaggregation in Environmental Matrices Using Batch Measurements

Journal Article Environmental Engineering Science · July 1, 2014 In this study, we present a method for determining the relative affinity of nanoparticles (NPs) for an ensemble of other particles in a complex, heterogeneous suspension. We evaluated this method for NPs heteroaggregating with suspended solids present in a ... Full text Cite

Possible Applications of Fullerene Nanomaterials in Water Treatment and Reuse

Chapter · May 6, 2014 Fullerenes are a class of molecules composed entirely of carbon. The first of these molecules, Buckminsterfullerene, was discovered in 1985 and contains 60 carbons in the form of a hollow spherical cage consisting of 12 pentagonal and 20 hexagonal faces. O ... Full text Cite

Emerging contaminant or an old toxin in disguise? Silver nanoparticle impacts on ecosystems.

Journal Article Environmental science & technology · May 2014 The use of antimicrobial silver nanoparticles (AgNPs) in consumer-products is rising. Much of these AgNPs are expected to enter the wastewater stream, with up to 10% of that eventually released as effluent into aquatic ecosystems with unknown ecological co ... Full text Open Access Cite

Validation and sensitivity of the FINE Bayesian network for forecasting aquatic exposure to nano-silver.

Journal Article The Science of the total environment · March 2014 The adaptive nature of the Forecasting the Impacts of Nanomaterials in the Environment (FINE) Bayesian network is explored. We create an updated FINE model (FINEAgNP-2) for predicting aquatic exposure concentrations of silver nanoparticles (AgNP) by combin ... Full text Cite

Silver nanoparticle behavior, uptake, and toxicity in Caenorhabditis elegans: effects of natural organic matter.

Journal Article Environmental science & technology · March 2014 Significant progress has been made in understanding the toxicity of silver nanoparticles (Ag NPs) under carefully controlled laboratory conditions. Natural organic matter (NOM) is omnipresent in complex environmental systems, where it may alter the behavio ... Full text Cite

Influence of natural organic matter on transport and retention of polymer coated silver nanoparticles in porous media.

Journal Article Journal of hazardous materials · January 2014 Interactions between organic matter (OM) and engineered polymer coatings as they affect the retention of polyvinylpyrrolidone (PVP) polymer-coated silver nanoparticles (AgNPs) were studied. Two distinct types of OM-cysteine representing low molecular weigh ... Full text Cite

Modification and performance testing of commercially available ceramic membranes for direct contact membrane distillation

Journal Article AWWA/AMTA 2014 Membrane Technology Conference and Exposition · January 1, 2014 Ceramic membranes were treated with a hydrophobic coating for use in direct contact membrane distillation (DCMD). Two types of anodized aluminum oxide membranes and two pore sizes of a titanium dioxide-zirconium dioxide membrane were coated with a 1H,1H,2H ... Cite

Nanoparticle core properties affect attachment of macromolecule-coated nanoparticles to silica surfaces

Journal Article Environmental Chemistry · January 1, 2014 Environmental context The increasing use of engineered nanoparticles has led to concerns over potential exposure to these novel materials. Predictions of nanoparticle transport in the environment and exposure risks could be simplified if all nanoparticles ... Full text Cite

Aquatic biofouling prevention by electrically charged nanocomposite polymer thin film membranes

Journal Article AMTA/AWWA Membrane Technology Conference and Exposition 2013 · December 19, 2013 Electrically conductive polymer-nanocomposite (ECPNC) reverse osmosis (RO) thin film membranes were demonstrated to have biofilm-preventing capabilities under extreme bacteria and organic material loadings. A simple route to the creation and application of ... Cite

Optimizing carbon nanotube-reinforced polysulfone ultrafiltration membranes through carboxylic acid functionalization

Journal Article Journal of Membrane Science · November 5, 2013 Multiwalled carbon nanotubes (CNTs) carboxylated to varying weight percentages were added to polysulfone membranes. The degree to which the CNTs were retained within the membrane during membrane production, operation and cleaning was examined as a function ... Full text Cite

Impacts and physico-chemical behavior of inorganic nanoparticles in the environment

Chapter · November 1, 2013 The specific properties of engineered nanoparticles have been used in many fields (e.g., medicine, cosmetic, electronics, catalysis, and environment). Their increased production and use come along with questions about their environmental and human health i ... Full text Cite

Lipophilic nano-bismuth inhibits bacterial growth, attachment, and biofilm formation

Journal Article Surface Innovations · September 1, 2013 There is an urgent need for low-cost and low-toxicity antimicrobial agents for water treatment and medical applications. Current approaches utilize relatively expensive and corrosive chemicals and disinfectants to reduce, prevent or remove biofilms in tech ... Full text Cite

Comparison of enhanced microsphere transport in an iron-oxide-coated porous medium by pre-adsorbed and co-depositing organic matter

Journal Article Chemical Engineering Journal · August 15, 2013 The effects of two types of organic matter (OM) (humic acid and protein) on colloid transport in porous media were investigated with column experiments and numerical modeling. Colloid deposition was explored in double-pulse experiments (DPEs) by injecting ... Full text Cite

Silver nanoparticle-alginate composite beads for point-of-use drinking water disinfection.

Journal Article Water research · August 2013 Silver nanoparticles (AgNPs)-alginate composite beads were synthesized using three different approaches as filler materials of packed columns for simultaneous filtration-disinfection as an alternative portable water treatment process. The prepared composit ... Full text Cite

Cerium oxide nanoparticles are more toxic than equimolar bulk cerium oxide in Caenorhabditis elegans.

Journal Article Archives of environmental contamination and toxicology · August 2013 Engineered cerium oxide nanoparticles (CeO2 NPs) are widely used in biomedical and engineering manufacturing industries. Previous research has shown the ability of CeO2 NPs to act as a redox catalyst, suggesting potential to both induce and alleviate oxida ... Full text Cite

A standardised approach for the dispersion of titanium dioxide nanoparticles in biological media.

Journal Article Nanotoxicology · June 2013 We describe a comprehensive optimisation study culminating in a standardised and validated approach for the preparation of titanium dioxide (TiO₂) nanoparticle dispersions in relevant biological media. This study utilises a TiO₂ reference nanomaterial base ... Full text Cite

Electrically conducting nanocomposite polymer thin film reverse osmosis membranes for biofilm prevention

Conference ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY · April 7, 2013 Link to item Cite

Modeling nanomaterial fate in wastewater treatment: Monte Carlo simulation of silver nanoparticles (nano-Ag)

Journal Article Science of the Total Environment · April 1, 2013 Wastewater effluent and sewage sludge are predicted to be important release pathways for nanomaterials used in many consumer products. The uncertainty and variability of potential nanomaterial inputs, nanomaterial properties, and the operation of the waste ... Full text Cite

Aquatic biofouling prevention by electrically charged nanocomposite polymer thin film membranes.

Journal Article Environmental science & technology · March 2013 Electrically conductive polymer-nanocomposite (ECPNC) tight nanofiltration (NF) thin film membranes were demonstrated to have biofilm-preventing capabilities under extreme bacteria and organic material loadings. A simple route to the creation and applicati ... Full text Cite

Transport and retention of selected engineered nanoparticles by porous media in the presence of a biofilm.

Journal Article Environmental science & technology · March 2013 Column experiments were conducted to investigate the transport of aqueous C60 (aqu-nC60), fullerol, silver nanoparticles (NPs) coated with polyvinylpyrrolidone (Ag-PVP) and stabilized by citrate (Ag-CIT) in biofilm-laden porous media. Gram-negative Pseudom ... Full text Cite

Modeling approaches for characterizing and evaluating environmental exposure to engineered nanomaterials in support of risk-based decision making.

Journal Article Environmental science & technology · February 2013 As the use of engineered nanomaterials becomes more prevalent, the likelihood of unintended exposure to these materials also increases. Given the current scarcity of experimental data regarding fate, transport, and bioavailability, determining potential en ... Full text Cite

Sulfidation of silver nanoparticles: natural antidote to their toxicity.

Journal Article Environmental science & technology · January 2013 Nanomaterials are highly dynamic in biological and environmental media. A critical need for advancing environmental health and safety research for nanomaterials is to identify physical and chemical transformations that affect the nanomaterial properties an ... Full text Cite

Impacts and physico-chemical behavior of inorganic nanoparticles in the environment

Chapter · January 1, 2013 The specific properties of engineered nanoparticles have been used in many fields (e.g., medicine, cosmetic, electronics, catalysis, and environment). Their increased production and use come along with questions about their environmental and human health i ... Full text Cite

Environmental implications and applications of carbon nanomaterials in water treatment.

Journal Article Water science and technology : a journal of the International Association on Water Pollution Research · January 2013 Carbon nanomaterials have been proposed as a basis for developing new technologies for photocatalytic oxidation and disinfection, improved membrane processes, adsorbents, and biofilm-resistant surfaces. This study details recent progress towards the develo ... Full text Cite

Bacteriophage inactivation by UV-A illuminated fullerenes: Role of nanoparticle-virus association

Journal Article Water Quality Technology Conference and Exposition 2012 · December 1, 2012 A significant potential for nanoparticle incorporation into water treatment applications has focused on bacteria and virus inactivation due to singlet oxygen generation. Photosensitization of hydrophilic fullerenes generates singlet oxygen (1O2), and this ... Cite

Deposition of aggregated nanoparticles--a theoretical and experimental study on the effect of aggregation state on the affinity between nanoparticles and a collector surface.

Journal Article Environmental science & technology · December 2012 Theoretical and experimental approaches were employed to study the effect of aggregation on the affinity between nanoparticles (NPs) and a flat surface that is quantified by the attachment efficiency. Computer simulations were used to generate virtual aggr ... Full text Cite

Antimicrobial effects of commercial silver nanoparticles are attenuated in natural streamwater and sediment.

Journal Article Ecotoxicology (London, England) · October 2012 Given the demonstrated antimicrobial properties of silver nanoparticles (AgNPs), and the key role that microorganisms play in performing critical ecosystem functions such as decomposition and nutrient cycling, there is growing concern that AgNP pollution m ... Full text Cite

Theoretical investigation on the steric interaction in colloidal deposition.

Journal Article Langmuir : the ACS journal of surfaces and colloids · October 2012 A theoretical investigation was conducted upon the steric interaction between a spherical particle and a flat plate. The effects of curvature on both the segment density distribution of polymer and on the steric interaction energy between a particle and a ... Full text Cite

A highly electrically conductive polymer-multiwalled carbon nanotube nanocomposite membrane

Journal Article Journal of Membrane Science · October 1, 2012 Electrically conductive polymeric ultrafiltration membranes were fabricated by pressure filtering a thin layer of poly(vinyl alcohol) - cross-linked with carboxylated multiwalled carbon nanotubes (CNTs) and succinic acid - onto a support membrane. The effe ... Full text Cite

Recent advances in proton exchange membranes for fuel cell applications

Journal Article Chemical Engineering Journal · September 15, 2012 Fuel cell technology has drawn much attention from scientists and engineers due to its high energy conversion efficiency, quick start-up in the beginning of operation, portability, and minimal pollution. Proton exchange membranes (PEMs) play an important r ... Full text Cite

Uptake of silver nanoparticles and toxicity to early life stages of Japanese medaka (Oryzias latipes): effect of coating materials.

Journal Article Aquatic toxicology (Amsterdam, Netherlands) · September 2012 Silver nanoparticles (AgNPs) with antimicrobial properties are perhaps the most deployed engineered nanomaterials in consumer products. Almost all AgNPs are coated with organic materials to enhance their dispersion in water. Contributions of coatings to th ... Full text Cite

Detection, characterization, and abundance of engineered nanoparticles in complex waters by hyperspectral imagery with enhanced Darkfield microscopy.

Journal Article Environmental science & technology · September 2012 We introduce a novel methodology based on hyperspectral imagery with enhanced Darkfield microscopy for detection, characterization, and analysis of engineered nanoparticles in both ultrapure water and in complex waters, such as simulated-wetland ecosystem ... Full text Cite

Effects of humic acid and electrolytes on photocatalytic reactivity and transport of carbon nanoparticle aggregates in water.

Journal Article Water research · September 2012 The effects of naturally occurring macromolecules such as humic acid (HA) and electrolytes on four fullerene nanoparticle suspensions (i.e., C(60), C(60)(OH)(24), single- and multiwall carbon nanotubes) were explored with respect to: (1) characteristics of ... Full text Cite

Paradox of stability of nanoparticles at very low ionic strength.

Journal Article Langmuir : the ACS journal of surfaces and colloids · July 2012 The scaling of electrical double layer interaction energy from a plate-plate system to a sphere-plate system was reexamined, and it was found that accurate scaling without resorting to the Derjaguin approximation theoretically predicts the destabilization ... Full text Cite

Impact of aggregate size and structure on the photocatalytic properties of TiO2 and ZnO nanoparticles.

Journal Article Environmental science & technology · July 2012 Aggregation of photocatalytic semiconductors was determined to reduce the generation of free hydroxyl radicals in aqueous suspensions in a fashion dependent on aggregate size and structure. Static light scattering measurements were used to follow temporal ... Full text Cite

Comparison of chemical cleaning reagents and characterization of foulants of nanofiltration membranes used in surface water treatment

Journal Article Desalination · June 15, 2012 Fouling continues to be an important limitation in membrane operation for water treatment. In this work, we compare various chemical agents with respect to their ability to remove fouling as well as their potential to deteriorate membrane rejection or the ... Full text Cite

The use of Bayesian networks for nanoparticle risk forecasting: model formulation and baseline evaluation.

Journal Article The Science of the total environment · June 2012 We describe the use of Bayesian networks as a tool for nanomaterial risk forecasting and develop a baseline probabilistic model that incorporates nanoparticle specific characteristics and environmental parameters, along with elements of exposure potential, ... Full text Cite

Bacteriophage inactivation by UV-A illuminated fullerenes: role of nanoparticle-virus association and biological targets.

Journal Article Environmental science & technology · June 2012 Inactivation rates of the MS2 bacteriophage and (1)O(2) generation rates by four different photosensitized aqueous fullerene suspensions were in the same order: aqu-nC(60) < C(60)(OH)(6) ≈ C(60)(OH)(24) < C(60)(NH(2))(6). Alterations to capsid protein seco ... Full text Cite

Theoretical investigation on the interaction between a soft particle and a rigid surface

Journal Article Chemical Engineering Journal · May 15, 2012 An extension of Derjaguin-Landau-Verwey-Overbeek (DLVO) theory was developed to model the potential energy of interaction between a soft particle (particle coated with either uncharged polymer or polyelectrolyte) and a rigid flat surface prior to the parti ... Full text Cite

Characterization of surface hydrophobicity of engineered nanoparticles.

Journal Article Journal of hazardous materials · May 2012 The surface chemistry of nanoparticles, including their hydrophobicity, is a key determinant of their fate, transport and toxicity. Engineered NPs often have surface coatings that control the surface chemistry of NPs and may dominate the effects of the nan ... Full text Cite

Long-Term Transformation and Fate of Manufactured Ag Nanoparticles in a Simulated Large Scale Freshwater Emergent Wetland.

Journal Article Environmental science & technology · April 2012 Transformations and long-term fate of engineered nanomaterials must be measured in realistic complex natural systems to accurately assess the risks that they may pose. Here, we determine the long-term behavior of poly(vinylpyrrolidone)-coated silver nanopa ... Full text Open Access Cite

Disruption of PF4/H multimolecular complex formation with a minimally anticoagulant heparin (ODSH).

Journal Article Thromb Haemost · April 2012 Recent studies have shown that ultra-large complexes (ULCs) of platelet factor 4 (PF4) and heparin (H) play an essential role in the pathogenesis of heparin-induced thrombocytopenia (HIT), an immune-mediated disorder caused by PF4/H antibodies. Because ant ... Full text Link to item Cite

Polymeric coatings on silver nanoparticles hinder autoaggregation but enhance attachment to uncoated surfaces.

Journal Article Langmuir : the ACS journal of surfaces and colloids · March 2012 The propensity of silver nanoparticles (AgNPs) having two different polymer coatings (poly(vinylpyrrolidone), PVP, or gum arabic, GA) to aggregate, or to deposit to a reference surface (silica), was explored as a basis for differentiating the effect of sur ... Full text Cite

Proton-conducting composite membranes derived from ferroxane-polyvinyl alcohol complex

Journal Article Environmental Engineering Science · February 1, 2012 A composite membrane composed of iron oxide and polyvinyl alcohol (PVA) was investigated as an alternative electrolyte material for proton exchange membranes (PEMs) in fuel cells using hydrogen as a fuel. Acetic acid (AA)-stabilized lepidocrocite (γ-FeOOH) ... Full text Cite

Erratum: A life cycle framework for the investigation of environmentally benign nanoparticles and products [Phys. Status Solidi RRL 5, No. 9, 312-317 (2011)]

Journal Article Physica Status Solidi - Rapid Research Letters · February 1, 2012 The name of a further author and contributor to this work, Roland Clift, has been added to the author list of the article in agreement with all co-authors. It had been inadvertently omitted from the original version of the paper. © 2012 WILEY-VCH Verlag Gm ... Full text Cite

Ultrasonic dispersion of nanoparticles for environmental, health and safety assessment--issues and recommendations.

Journal Article Nanotoxicology · December 2011 Studies designed to investigate the environmental or biological interactions of nanoscale materials frequently rely on the use of ultrasound (sonication) to prepare test suspensions. However, the inconsistent application of ultrasonic treatment across labo ... Full text Cite

Meditations on the ubiquity and mutability of nano-sized materials in the environment.

Journal Article ACS nano · November 2011 A wide variety of nanomaterials can be found naturally occurring in the environment, although finding and characterizing these materials remains a challenge due to their size. Recent studies in the field have shown that natural nanomaterials are common in ... Full text Cite

T 4 workshop report nanotoxicology: "The end of the beginning" - Signs on the roadmap to a strategy for assuring the safe application and use of nanomaterials

Conference Altex · October 11, 2011 In October 2010, a group of experts met as part of the transatlantic think tank for toxicology (t 4) to exchange ideas about the current status and future of safety testing of nanomaterials. At present, there is no widely accepted path forward to assure ap ... Cite

Comparison of the photosensitivity and bacterial toxicity of spherical and tubular fullerenes of variable aggregate size

Journal Article Journal of Nanoparticle Research · October 1, 2011 Nanomaterials such as fullerene C60, carbon nanotubes (CNTs), and other fullerenes show unique electrical, chemical, mechanical, and thermal properties that are not well understood in the context of the environmental behavior of this class of carbon-based ... Full text Cite

A risk forecasting process for nanostructured materials, and nanomanufacturing

Journal Article Comptes Rendus Physique · September 1, 2011 Nanomaterials exhibit novel properties that enable new applications ranging from molecular electronics to energy production. Proactive consideration of the potential impacts on human health and the environment resulting from nanomaterial production and use ... Full text Cite

A life cycle framework for the investigation of environmentally benign nanoparticles and products

Journal Article Physica Status Solidi - Rapid Research Letters · September 1, 2011 While significant advances in our understanding of the behavior of engineered nanoparticles in the environment continue, there remains a need to engage the nanoparticle research community directly in the development and evaluation of environmentally benign ... Full text Cite

Impact of aggregate size and structure on the photocatalytic properties of TiO2 and ZnO nanoparticles

Conference ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY · August 28, 2011 Link to item Cite

Interlaboratory comparison of size and surface charge measurements on nanoparticles prior to biological impact assessment

Journal Article Journal of Nanoparticle Research · July 1, 2011 The International Alliance for NanoEHS Harmonization (IANH) organises interlaboratory comparisons of methods used to study the potential biological impacts of nanomaterials. The aim of IANH is to identify and reduce or remove sources of variability and irr ... Full text Cite

Deposition of silver nanoparticles in geochemically heterogeneous porous media: predicting affinity from surface composition analysis.

Journal Article Environmental science & technology · June 2011 The transport of uncoated silver nanoparticles (AgNPs) in a porous medium composed of silica glass beads modified with a partial coverage of iron oxide (hematite) was studied and compared to that in a porous medium composed of unmodified glass beads (GB). ... Full text Cite

Quantification of fullerene (C60) in aqueous samples and use of C70 as surrogate standard

Journal Article Chemical Engineering Journal · June 1, 2011 With the increasing production and use of fullerene nanomaterials, it is imperative that quantitative analytical methods be developed to study their occurrence and behavior in the natural environment so that the risks posed by these materials to ecosystem ... Full text Cite

Synthesis and characterization of a carbon nanotube/polymer nanocomposite membrane for water treatment

Journal Article Desalination · May 3, 2011 Multi-wall carbon nanotube (MWCNT)/aromatic polyamide (PA) nanocomposite membranes were synthesized by a polymer grafting process. Surface morphology, roughness, and mechanical strength of the resultant nanocomposite membranes were characterized by scannin ... Full text Cite

Estimating production data for five engineered nanomaterials as a basis for exposure assessment.

Journal Article Environmental science & technology · April 2011 The magnitude of engineered nanomaterials (ENMs) being produced and potentially released to the environment is a crucial and thus far unknown input to exposure assessment. This work estimates upper and lower bound annual United States production quantities ... Full text Cite

Toxicity reduction of polymer-stabilized silver nanoparticles by sunlight

Journal Article Journal of Physical Chemistry C · March 24, 2011 The environmental and health impacts of nanomaterials are becoming important topics of research in recent years. The unique advantages offered by these nanomaterials in wide range of applications cannot be realized until these concerns are resolved. Among ... Full text Cite

More than the ions: the effects of silver nanoparticles on Lolium multiflorum.

Journal Article Environmental science & technology · March 2011 Silver nanoparticles (AgNPs) are increasingly used as antimicrobial additives in consumer products and may have adverse impacts on organisms when they inadvertently enter ecosystems. This study investigated the uptake and toxicity of AgNPs to the common gr ... Full text Cite

Characterization of ZnS nanoparticle aggregation using photoluminescence.

Journal Article Langmuir : the ACS journal of surfaces and colloids · February 2011 Aggregation of uncoated ZnS nanoparticles was determined to have an unexpected impact on the particle's photoluminescent properties. Aggregation had significant consequences to both band-edge and trap-site photoluminescence, increasing the former and decre ... Full text Cite

Toward identifying the next generation of superfund and hazardous waste site contaminants.

Journal Article Environmental health perspectives · January 2011 BackgroundThis commentary evolved from a workshop sponsored by the National Institute of Environmental Health Sciences titled "Superfund Contaminants: The Next Generation" held in Tucson, Arizona, in August 2009. All the authors were workshop part ... Full text Cite

Occurrence and composition of particulates in filter process streams

Journal Article Journal - American Water Works Association · January 1, 2011 The objective of this work was to provide an in-depth analysis of the particulate composition of influent and effluent streams for granular media filters at full-scale water treatment plants. Findings from these analyses were evaluated with respect to the ... Full text Cite

T 4 workshop report nanotoxicology: "The end of the beginning" - Signs on the roadmap to a strategy for assuring the safe application and use of nanomaterials

Journal Article Altex · 2011 In October 2010, a group of experts met as part of the transatlantic think tank for toxicology (t 4) to exchange ideas about the current status and future of safety testing of nanomaterials. At present, there is no widely accepted path forward to assure ap ... Cite

Comparative photochemical reactivity of spherical and tubular fullerene nanoparticles in water under ultraviolet (UV) irradiation.

Journal Article Water research · January 2011 Fullerene nanomaterials are finding an increasing number of applications in energy and environmental technologies. However, substantial production and use of fullerenes will likely lead to environmental exposure with unknown consequences. In this study, aq ... Full text Cite

t⁴ workshop report. Nanotoxicology: "the end of the beginning" - signs on the roadmap to a strategy for assuring the safe application and use of nanomaterials.

Journal Article ALTEX · January 2011 In October 2010, a group of experts met as part of the transatlantic think tank for toxicology (t4) to exchange ideas about the current status and future of safety testing of nanomaterials. At present, there is no widely accepted path forward to assure app ... Full text Cite

Heparin modifies the immunogenicity of positively charged proteins.

Journal Article Blood · December 23, 2010 The immune response in heparin-induced thrombocytopenia is initiated by and directed to large multimolecular complexes of platelet factor 4 (PF4) and heparin (H). We have previously shown that PF4:H multimolecular complexes assemble through electrostatic i ... Full text Link to item Cite

Environmental occurrences, behavior, fate, and ecological effects of nanomaterials: an introduction to the special series.

Journal Article Journal of environmental quality · November 2010 The release of engineered nanomaterials (ENMs) into the biosphere will increase as industries find new and useful ways to utilize these materials. Scientists and engineers are beginning to assess the material properties that determine the fate, transport, ... Full text Cite

Exact analytical expressions for the potential of electrical double layer interactions for a sphere-plate system.

Journal Article Langmuir : the ACS journal of surfaces and colloids · November 2010 Exact, closed-form analytical expressions are presented for evaluating the potential energy of electrical double layer (EDL) interactions between a sphere and an infinite flat plate for three different types of interactions: constant potential, constant ch ... Full text Open Access Cite

Comparison of methods for fullerene detection and measurements of reactive oxygen production in cosmetic products

Journal Article Environmental Engineering Science · September 1, 2010 Numerous commercial products incorporate novel engineered nanomaterials such as gold, silica, zinc oxide, and fullerenes in complex matrices such as polymer composites, creams, and textiles. Analytical methods for detecting nanomaterials in complex matrice ... Full text Open Access Cite

Heterogeneities in fullerene nanoparticle aggregates affecting reactivity, bioactivity, and transport.

Journal Article ACS nano · September 2010 Properties of nanomaterial suspensions are typically summarized by average values for the purposes of characterizing these materials and interpreting experimental results. We show in this work that the heterogeneity in aqueous suspensions of fullerene C(60 ... Full text Open Access Cite

Considerations in evaluating the physicochemical properties and transformations of inorganic nanoparticles in water.

Journal Article Nanomedicine (London, England) · August 2010 Nanomaterials and the technologies they enable are often presented as important innovations that will play a critical role in solving problems that range from energy, water and food supply to improved medical treatments. Ironically, many of the more 'media ... Full text Cite

Theoretical framework for nanoparticle reactivity as a function of aggregation state

Journal Article Langmuir · July 6, 2010 Theory is developed that relates the reactivity of nanoparticles to the structure of aggregates they may form in suspensions. This theory is applied to consider the case of reactive oxygen species (ROS) generation by photosensitization of C60 fullerenes. V ... Full text Cite

Concurrent aggregation and deposition of TiO2 nanoparticles in a sandy porous media.

Journal Article Environmental science & technology · July 2010 The possibility of simultaneous particle aggregation and deposition in a porous medium was examined for the case of TiO(2) nanoparticles (NPs). While potential for particle aggregation is typically assumed to be negligible in porous media due to favored in ... Full text Open Access Cite

Membrane filtration of fullerene nanoparticle suspensions: effects of derivatization, pressure, electrolyte species and concentration.

Journal Article Journal of colloid and interface science · June 2010 Particle aggregation is induced in derivatized fullerene (fullerol) suspensions by introducing different counter-ion species (Na(+) Ca(2+) and Mg(2+)) and concentrations. The suspensions are filtered through 20 nm ceramic membranes under different transmem ... Full text Cite

Polymeric membranes from colloidal templates with tunable morphology

Journal Article Macromolecular Reaction Engineering · June 1, 2010 Polymeric porous membranes were fabricated from templates made from silica particles. The templates were obtained by self-assembly and by the Langmuir-Blodgett (L-B) technique. For the self-assembly technique, suspensions of silica particles in ethanol wer ... Full text Cite

Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans

Journal Article Aquatic Toxicol · 2010 Silver nanoparticles (AgNPs) are frequently used as antimicrobials. While the mechanism(s) by which AgNPs are toxic are unclear, their increasing use raises the concern that release into the environment could lead to environmental toxicity. We characterize ... Cite

Preparation and characterization of fouling-resistant photocatalytic metal membrane embedded with self-organized TiO₂ nano tube.

Journal Article Water science and technology : a journal of the International Association on Water Pollution Research · January 2010 A self-organized nano-structured, photocatalytic TiO₂ membrane with large surface area of anatase crystallites was successfully fabricated by anodization. The nano-structured anodized TiO₂ membrane was characterized using SEM, XRD and TEM techniques and th ... Full text Cite

Possible Applications of Fullerene Nanomaterials in Water Treatment and Reuse

Journal Article · December 1, 2009 This chapter details recent progress toward the development of the proposed applications. It examines the development of fullerene composite materials using CNTs to strengthen membranes and modify membrane surface chemistry. It explores the use of fulleren ... Full text Cite

Hydration and dispersion of C60 in aqueous systems: The nature of water-fullerene interactions

Journal Article Langmuir · October 6, 2009 The nature of fullerene-water interactions and the role that they play in the fate of C60 in aqueous systems is poorly understood. This work provides spectroscopic evidence for the surface hydroxylation of the initially hydrophobic C60 molecule when immers ... Full text Cite

Towards a definition of inorganic nanoparticles from an environmental, health and safety perspective.

Journal Article Nature nanotechnology · October 2009 The regulation of engineered nanoparticles requires a widely agreed definition of such particles. Nanoparticles are routinely defined as particles with sizes between about 1 and 100 nm that show properties that are not found in bulk samples of the same mat ... Full text Cite

Decreasing uncertainties in assessing environmental exposure, risk, and ecological implications of nanomaterials.

Journal Article Environmental science & technology · September 2009 Determining the fate and interactions of nanomaterials in complex environmental contexts is required to assess exposure and possible harm as well as to inform regulation. As the nanotechnology industry moves up into the rarified air of trillion dollar econ ... Full text Cite

Mechanisms of bacteriophage inactivation via singlet oxygen generation in UV illuminated fullerol suspensions.

Journal Article Environmental science & technology · September 2009 Nonenveloped viruses are shown to be inactivated by singlet oxygen ((1)O2) produced in UVA photosensitized aqueous suspensions of a polyhydroxylated fullerene (C60(OH)22-24; fullerol, 40 microM). Experiments were performed with MS2, a ssRNA bacteriophage, ... Full text Cite

Internationalizing tomorrow's researchers - Strategies and experiences from the partnership for education and research in membrane nanotechnologies

Journal Article ASEE Annual Conference and Exposition, Conference Proceedings · September 1, 2009 The Partnership for Education and Research in Membrane Nanotechnologies (PERMEANT) is an NSF PIRE project involving Michigan State University (USA), Duke University (USA), Kyiv-Mohyla Academy (Ukraine), Université Paul Sabatier (France), Centre Européen de ... Cite

Ceramic membranes formed from nanoparticles: An environmental technology

Journal Article Actualite Chimique · August 10, 2009 Membranes, which are used commercially for the last 50 years, are more and more employed since the last ten years. They can be used at the industrial level for liquid, solid or gaseous separations down to the microscopic scale. In spite of all the advantag ... Cite

Evaluation of the oxidation of organic compounds by aqueous suspensions of photosensitized hydroxylated-C60 fullerene aggregates.

Journal Article Environmental science & technology · August 2009 Ultraviolet (UV) irradiated polyhydroxylated fullerene (fullerol) nanomaterials are examined for their potential to degrade organic compounds via reactive oxygen species (ROS) mediated by a photosensitization process. Organic compounds were selected for th ... Full text Cite

Comparative toxicity of C60 aggregates toward mammalian cells: role of tetrahydrofuran (THF) decomposition.

Journal Article Environmental science & technology · August 2009 C60 fullerene is a promising material because of its unique physiochemical properties. However, previous studies have reported that colloidal aggregates of C60 (nC60) produce toxicity in fish and human cell cultures. The preparation method of nC60 raises q ... Full text Cite

Estimates of upper bounds and trends in nano-TiO2 production as a basis for exposure assessment.

Journal Article Environmental science & technology · June 2009 An upper bound is estimated for the magnitude of potential exposure to nano-TiO2 with the purpose of enabling exposure assessment and, ultimately, risk assessment Knowledge of the existing bulk TiO2 market is combined with available nano-TiO2 production da ... Full text Cite

Comparative photoactivity and antibacterial properties of C60 fullerenes and titanium dioxide nanoparticles.

Journal Article Environmental science & technology · June 2009 The production of reactive oxygen species (ROS) by aqueous suspensions of fullerenes and nano-TiO2 (Degussa P25) was measured both in ultrapure water and in minimal Davis (MD) microbial growth medium. Fullerol (hydroxylated C60) produced singlet oxygen (1O ... Full text Cite

CeO2 nanoparticles induce DNA damage towards human dermal fibroblasts in vitro

Journal Article Nanotoxicology · June 1, 2009 Cerium dioxide nanoparticles have been proposed for an increasing number of applications in biomedicine, cosmetic, as polishing materials and also as byproducts from automotive fuel additives. The aim of this study was to examine the potential in vitro cyt ... Full text Cite

Impacts of nanosilver on microbial activity in wetlands and streams

Journal Article GEOCHIMICA ET COSMOCHIMICA ACTA · June 1, 2009 Link to item Cite

Chemical stability of metallic nanoparticles: a parameter controlling their potential cellular toxicity in vitro.

Journal Article Environmental pollution (Barking, Essex : 1987) · April 2009 The level of production of nanoparticles will inevitably lead to their appearance in air, water, soils, and organisms. A theoretical framework that relates properties of nanoparticles to their biological effects is needed to identify possible risks to huma ... Full text Cite

Surface modification of nanostructured ceramic membranes for direct contact membrane distillation

Journal Article Journal of Membrane Science · April 1, 2009 The objective of this research was to evaluate a select number of promising surface treatments for making ceramic membranes hydrophobic and suitable for application in direct contact membrane distillation (DCMD). Alumina anodisc™ membranes were made hydrop ... Full text Cite

Comparison of manufactured and black carbon nanoparticle concentrations in aquatic sediments.

Journal Article Environmental pollution (Barking, Essex : 1987) · April 2009 In this paper, we show that concentrations of manufactured carbon-based nanoparticles (MCNPs) in aquatic sediments will be negligible compared to levels of black carbon nanoparticles (BCNPs). This is concluded from model calculations accounting for MCNP se ... Full text Cite

Effects of fullerene nanoparticles on Escherichia coli K12 respiratory activity in aqueous suspension and potential use for membrane biofouling control

Journal Article Journal of Membrane Science · March 5, 2009 The attachment and respiratory activity of the model bacterium, Escherichia coli K12 on microfiltration (MF) membranes coated with the fullerene C60 and the influence of colloidal aggregates of C60 (nC60) on this bacterium in a suspended culture environmen ... Full text Cite

Internationalizing tomorrow's researchers - Strategies and experiences from the partnership for education and research in membrane nanotechnologies

Conference ASEE Annual Conference and Exposition, Conference Proceedings · January 1, 2009 The Partnership for Education and Research in Membrane Nanotechnologies (PERMEANT) is an NSF PIRE project involving Michigan State University (USA), Duke University (USA), Kyiv-Mohyla Academy (Ukraine), Université Paul Sabatier (France), Centre Européen de ... Cite

Ceramic membranes formed from nanoparticles: An environmental technology

Journal Article Actualite Chimique · 2009 Membranes, which are used commercially for the last 50 years, are more and more employed since the last ten years. They can be used at the industrial level for liquid, solid or gaseous separations down to the microscopic scale. In spite of all the advantag ... Cite

Relation between the redox state of iron-based nanoparticles and their cytotoxicity toward Escherichia coli.

Journal Article Environmental science & technology · September 2008 Iron-based nanoparticles have been proposed for an increasing number of biomedical or environmental applications although in vitro toxicity has been observed. The aim of this study was to understand the relationship between the redox state of iron-based na ... Full text Cite

Fast proton-conducting ceramic membranes derived from ferroxane nanoparticle-precursors as fuel cell electrolytes

Journal Article Fuel Cells Bulletin · August 1, 2008 Ceramic membranes derived from carboxylate-ferroxane nanoparticles are shown to yield high power (5.21 mW/cm2) and current (16.5 mA/cm2) densities in a working membrane-electrode assembly, comparable to those obtained using untreated Nafion® membranes. The ... Full text Cite

Fast proton-conducting ceramic membranes derived from ferroxane nanoparticle-precursors as fuel cell electrolytes

Journal Article Journal of Membrane Science · June 20, 2008 Ceramic membranes derived from carboxylate-ferroxane nanoparticles are shown to yield high power (5.21 mW cm-2) and current (16.5 mA cm-2) densities in a working membrane electrode assembly, comparable to those obtained using untreated Nafion® membranes. T ... Full text Cite

Mechanisms of photochemistry and reactive oxygen production by fullerene suspensions in water.

Journal Article Environmental science & technology · June 2008 Buckminsterfullerene (C60) is a known photosensitizer that produces reactive oxygen species (ROS) in the presence of light; however, its properties in aqueous environments are still not well understood or modeled. In this study, production of both singlet ... Full text Cite

Properties of membranes containing semi-dispersed carbon nanotubes

Journal Article Environmental Engineering Science · May 1, 2008 Carbon nanotubes exhibit superior mechanical and electrical properties that make them attractive for developing new composite materials. In this research, we examined the properties of ultrafiltration membranes made from carbon nanotube/polymer composites. ... Full text Cite

Antibacterial activity of fullerene water suspensions (nC60) is not due to ROS-mediated damage.

Journal Article Nano letters · May 2008 The cytotoxic and antibacterial properties of nC 60, a buckminsterfullerene water suspension, have been attributed to photocatalytically generated reactive oxygen species (ROS). However, in this work, neither ROS production nor ROS-mediated damage is found ... Full text Cite

Interferometric observations and kinetic modeling of the chemical cleaning of humic materials deposited on membranes

Journal Article Journal of Membrane Science · April 10, 2008 In this paper, vertical scanning interferometer (VSI) is used to analyze the decrease in cake layer height of membranes. Nanofiltration membrane was fouled with CaCl2 and humic acid solution for 24 h and then, put into cleaning solution to dissolve the dep ... Full text Cite

Enhanced adsorption of arsenic onto maghemites nanoparticles: As(III) as a probe of the surface structure and heterogeneity.

Journal Article Langmuir : the ACS journal of surfaces and colloids · April 2008 When normalized per unit of surface area, the quantity of arsenic adsorbed at the maghemite surface remains constant for particles between 300 and 20 nm. However, nanoparticles smaller than 20 nm exhibit enhanced adsorption capacity. The origin of this obs ... Full text Cite

Removal of hormones and antibiotics by nanofiltration membranes

Journal Article Journal of Membrane Science · February 15, 2008 The removal of several hormones and antibiotics by nanofiltration membranes was studied in mixed solutions. The effects of solution chemistry, organic matter and salinity were investigated on the rejection of tetracycline's and sulfanamides and selected ho ... Full text Cite

Assessing environmental exposure potential of nano-TiO2

Conference ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts · January 1, 2008 Cite

Nanomaterials as possible contaminants: the fullerene example.

Journal Article Water science and technology : a journal of the International Association on Water Pollution Research · January 2008 An assessment of the potential risks posed by nanomaterials will require case-by-case evaluations of the processes controlling exposure and hazards such as toxicity. Factors that control fullerene transport and transformation in aqueous environments and th ... Full text Cite

Determinants of PF4/heparin immunogenicity.

Journal Article Blood · December 15, 2007 Heparin-induced thrombocytopenia (HIT) is an antibody-mediated disorder that occurs with variable frequency in patients exposed to heparin. HIT antibodies preferentially recognize large macromolecular complexes formed between PF4 and heparin over a narrow ... Full text Link to item Cite

Proton conductivity and methanol rejection by ceramic membranes derived from ferroxane and alumoxane precursors

Journal Article Journal of Membrane Science · December 1, 2007 An iron-based ceramic material is shown to have favorable properties as an electrolyte material for proton exchange membranes in fuel cells. Iron (ferroxane) and aluminum (alumoxane) metal-oxane nanoparticles were prepared as precursor materials for membra ... Full text Cite

Transport and retention of colloidal aggregates of C60 in porous media: effects of organic macromolecules, ionic composition, and preparation method.

Journal Article Environmental science & technology · November 2007 The physical-chemical behavior of the fullerene C60 in environmental and physiological media is of interest for understanding the potential transport, exposure, and impacts of these materials on organisms and ecosystems. We considerthe role of electrolyte ... Full text Cite

Fullerol cluster formation in aqueous solutions: implications for environmental release.

Journal Article Journal of colloid and interface science · October 2007 Here we report on the characteristics of fullerol in aqueous systems and examine those conditions that affect the physical state of fullerol in water. When dispersed in water fullerol forms polydisperse suspensions characterized by both small ( approximate ... Full text Cite

Inactivation of bacteriophages via photosensitization of fullerol nanoparticles.

Journal Article Environmental science & technology · September 2007 The production of two reactive oxygen species through UV photosensitization of polyhydroxylated fullerene (fullerol) is shown to enhance viral inactivation rates. The production of both singlet oxygen and superoxide by fullerol in the presence of UV light ... Full text Cite

Morphological variations of precipitated salts on NF and RO membranes

Journal Article Environmental Engineering Science · May 21, 2007 Morphological variations of precipitated salts on nanofiltration (NF) and reverse osmosis (RO) membranes were compared for conditions where naturally occurring differences in feedwater composition, sometimes coupled with differences in hydrodynamics, produ ... Full text Cite

Effect of a fullerene water suspension on bacterial phospholipids and membrane phase behavior.

Journal Article Environmental science & technology · April 2007 Several fullerene-based nanomaterials generate reactive oxygen species that can damage cells. In this study, we investigated the effect of buckminsterfullerene (C60) introduced as colloidal aggregates in water (nC60) on bacterial membrane lipid composition ... Full text Cite

Environmental nanotechnology

Journal Article Environmental Engineering Science · January 8, 2007 Full text Cite

Affinity of C60 fullerenes with water

Journal Article Fullerenes Nanotubes and Carbon Nanostructures · December 1, 2006 In this work, we have studied the affinity of pure C 60 fullerenes with water. Although C 60 have always been known as hydrophobic particles, we show that this characteristic does not remain when contact between C 60 and H 2 O is forced by mechanical stirr ... Full text Cite

Bench-scale assessment of pretreatment to reduce fouling of salt-rejecting membranes

Journal Article Desalination · October 2, 2006 A batch, dead-end filtration method is used to compare the effect of various pretreatment operations on membrane performance. The dead-end method is compared with results obtained in cross-flow filtration as well as withconventional SDI measurements. Dead- ... Full text Cite

Nanotechnologies: tools for sustainability in a new wave of water treatment processes.

Journal Article Integrated environmental assessment and management · October 2006 In the environmental technology industry alone, nanomaterials will enable new means of reducing the production of industrial wastes, using resources more sparingly, remediating industrial contamination, providing potable water, and improving the efficiency ... Full text Cite

Comparison of the abilities of ambient and manufactured nanoparticles to induce cellular toxicity according to an oxidative stress paradigm.

Journal Article Nano letters · August 2006 Nanomaterial properties differ from those bulk materials of the same composition, allowing them to execute novel activities. A possible downside of these capabilities is harmful interactions with biological systems, with the potential to generate toxicity. ... Full text Cite

A comparison of vertical scanning interferometry (VSI) and atomic force microscopy (AFM) for characterizing membrane surface topography

Journal Article Journal of Membrane Science · July 5, 2006 In this paper, vertical scanning interferometry (VSI) and atomic force microscopy (AFM) were used to characterize the topography of several nanofiltration and reverse osmosis membrane surfaces. Comparing roughness results from the two different characteriz ... Full text Cite

Assessing the risks of manufactured nanomaterials.

Journal Article Environmental science & technology · July 2006 Full text Cite

In vitro interactions between DMSA-coated maghemite nanoparticles and human fibroblasts: A physicochemical and cyto-genotoxical study.

Journal Article Environmental science & technology · July 2006 Although the current production of oxide nanoparticles may be modest, the wide range of proposed applications and forecasted growth in production has raised questions about the potential impact of these nanoparticles on the environment and human health. Ir ... Full text Cite

Characterizing the impact of preparation method on fullerene cluster structure and chemistry

Journal Article Langmuir · April 11, 2006 We examined the physical and chemical characteristics of colloidal dispersions of fullerene materials (nC 60) produced through several solvent exchange processes and through extended mixing in water only. The nC 60 produced via the different methods were u ... Full text Cite

Responsible development of nanotechnologies for water and wastewater treatment.

Journal Article Water science and technology : a journal of the International Association on Water Pollution Research · January 2006 Emerging technologies, including nanotechnologies, affect the social, economic, and environmental dimensions of our world, often in ways that are entirely unanticipated. There is considerable effort underway to explore uses of nanomaterials in applications ... Full text Cite

Chemical interactions between dissolved organic matter and low-molecular weight organic compounds: Impacts on membrane separation

Journal Article Journal of Membrane Science · December 1, 2005 This work considers the hypothesis that the association of trace-level hydrophobic organic compounds with dissolved organic matter (DOM), similar to macromolecular materials found in natural water systems, may influence the contaminant's ability to permeat ... Full text Cite

Investigation of novel membrane synthesized with nanostructured metal oxanes for direct methanol fuel cell

Journal Article ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts · December 1, 2005 Iron oxide nanoparticles (ferroxane) and aluminum oxide nanoparticles (alumoxane) were synthesized via an environmentally benign process, alternative to sol-gel process, for direct methanol fuel cell. For both oxane materials, the conductivity improved as ... Cite

Investigation of novel membrane synthesized with nanostructured metal oxanes for direct methanol fuel cell

Journal Article ACS National Meeting Book of Abstracts · December 1, 2005 An iron-based ceramic material is a good candidate as membrane material for PEMFC with conductivities ranging from 1.5 to 2.5 × 10-2 S/cm at 58-100% RH. These membranes have comparable conductivity to the Nafion membrane with the advantages of lower materi ... Cite

Differential characteristics of fullerene nanoclusters produced through different techniques

Journal Article ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts · December 1, 2005 Several types of nC60 manufactured through four different, but established preparation techniques, i.e., solvent exchange using tetrahydrofuran (THF) and water (THF/nC60; solvent exchange using toluene, acetone, THF and water (TTA/nC60), solvent exchange u ... Cite

Relative risk analysis of several manufactured nanomaterials: an insurance industry context.

Journal Article Environmental science & technology · November 2005 A relative risk assessment is presented for the industrial fabrication of several nanomaterials. The production processes for five nanomaterials were selected for this analysis, based on their current or near-term potential for large-scale production and c ... Full text Cite

Future Directions for the Chemical Industry

Journal Article · October 12, 2005 Full text Cite

Aggregation and deposition characteristics of fullerene nanoparticles in aqueous systems

Journal Article Journal of Nanoparticle Research · October 1, 2005 The propensity of n-C60 to aggregate and deposit will play a key role in determining its longevity in aquatic systems, and therefore the potential exposure and risk presented by these colloids. We consider the origin of n-C60 stability and compare the aggr ... Full text Cite

Comparison of electrokinetic properties of colloidal fullerenes (n-C60) formed using two procedures.

Journal Article Environmental science & technology · September 2005 In this study we report on the electrokinetic behavior of colloidal aggregates of C60fullerenes (n-C60) produced through two different techniques: solvent exchange and extended mixing with water. In the first technique, used to produce colloidal materials ... Full text Cite

Physical and transport properties of bentonite-cement composites: A new material for in situ capping of contaminated underwater sediments

Journal Article Environmental Engineering Science · September 1, 2005 Formulations of bentonite-cement composites are explored as a basis for creating a range of structured, semipermeable layers adapted to in situ capping of contaminated underwater sediments. In addition to being mechanically stable, such composites allow fo ... Full text Cite

Controlling submicron-particle template morphology: Effect of solvent chemistry

Journal Article Journal of Colloid and Interface Science · March 15, 2005 Porous solids were obtained from self-assembled deposits of silica particles used as templates to form 3-D porous membranes. The effect of the solvent chemistry on the morphology of the deposits was investigated. The parameters of interest are surface tens ... Full text Cite

Fullerol-sensitized production of reactive oxygen species in aqueous solution.

Journal Article Environmental science & technology · March 2005 The relative production rate of reactive oxygen in aqueous solution sensitized by fullerol (a polyhydroxylated, water-soluble form of the fullerene C60) was measured and compared to known reactive oxygen sensitizers using an oxygen consumption method. The ... Full text Cite

Processes of particle deposition in membrane operation and fabrication.

Journal Article Water science and technology : a journal of the International Association on Water Pollution Research · January 2005 The processes that control particle deposition on surfaces that are of interest in understanding operational aspects of membrane filtration, also hold significance in controlling the morphology of particle deposits as intermediate steps in membrane fabrica ... Full text Cite

Design of in situ caps for the isolation of contaminated sediments

Journal Article AIChE Annual Meeting, Conference Proceedings · December 1, 2004 Formulations of bentonite-cement composites are explored as a basis for creating a range of structured, semipermeable layers adapted to in situ capping of contaminated underwater sediments. In addition to being mechanically stable, such composites provide ... Cite

Morphological design of nanoparticle assemblies: Application to environmental sensing

Journal Article AIChE Annual Meeting, Conference Proceedings · December 1, 2004 Silver nanoparticle deposition from suspension is proposed as a route for the morphological design of controllably disordered self-affine substrates for surface-enhanced Raman sensing of water pollutants. Ionic strength is used as a variable parameter to c ... Cite

Laboratory assessment of the mobility of nanomaterials in porous media.

Journal Article Environmental science & technology · October 2004 The production of significant quantities of engineered nanomaterials will inevitably result in the introduction of these materials to the environment. Mobility in a well-defined porous medium was evaluated for eight particulate products of nanochemistry to ... Full text Cite

Effect of hydrodynamics and solution ionic strength on permeate flux in cross-flow filtration: Direct experimental observation of filter cake cross-sections

Journal Article Journal of Membrane Science · September 15, 2004 The structure of membrane cakes formed in cross-flow filtration was investigated for conditions of variable particle size and solution ionic strength. In all cases, microscopic examination of membrane cake cross-sections revealed a stratified structure: a ... Full text Cite

Velocity effects on fullerene and oxide nanoparticle deposition in porous media.

Journal Article Environmental science & technology · August 2004 Products of nanochemistry have been proposed in a number of applications ranging from soil stabilization and cosmetics to groundwater remediation. A fundamental understanding of the transport properties of these materials is essential to assess their effic ... Full text Cite

Factors influencing flux decline during nanofiltration of solutions containing dyes and salts.

Journal Article Water research · January 2004 In this paper, factors influencing the flux decline of nanofiltration membranes for the treatment of dye bath wastewaters were investigated. Experiments were performed with synthetic wastewaters. Synthetic solutions were prepared in different dye and salt ... Full text Cite

Morphological design of nanoparticle assemblies: Application to environmental sensing

Journal Article AIChE Annual Meeting, Conference Proceedings · 2004 Silver nanoparticle deposition from suspension is proposed as a route for the morphological design of controllably disordered self-affine substrates for surface-enhanced Raman sensing of water pollutants. Ionic strength is used as a variable parameter to c ... Cite

Ceramic membranes derived from ferroxane nanoparticles: A new route for the fabrication of iron oxide ultrafiltration membranes

Journal Article Journal of Membrane Science · December 15, 2003 Ferroxane nanoparticles, obtained from reaction of lepidocrocite (FeOOH) and acetic acid at room temperature, were applied to the fabrication of ceramic membranes. The size of the nanoparticles and the kinetics of the reaction were investigated. Ferroxane ... Full text Cite

Alumina and aluminate ultrafiltration membranes derived from alumina nanoparticles

Journal Article Journal of Membrane Science · October 15, 2003 The fabrication of alumina ultrafiltration membranes using acetic acid surface stabilized alumina nanoparticles (A-alumoxanes) has been investigated. The pore size, pore size distribution, and molecular weight cut-off (MWCO) parameters of the resulting mem ... Full text Cite

Controlling nanoparticle template morphology: Effect of solvent chemistry

Journal Article Materials Research Society Symposium - Proceedings · July 25, 2003 Porous solids were obtained from self-assembled deposits of silica nanoparticles used as templates to form 3-D porous membranes. The effect of the solvent chemistry on the morphology of the deposits was investigated. The parameters of interest are surface ... Cite

Computational fluid dynamics modeling of the flow in a laboratory membrane filtration cell operated at low recoveries

Journal Article Chemical Engineering Science · January 1, 2003 Scaled-down models of industrial filtration units are often used in laboratory studies of membrane processes. Knowledge of the flow field and shear stresses at the membrane surface is vital for the accurate interpretation of bench scale experiments. In thi ... Full text Cite

Hydrodynamics of permeable aggregates in differential sedimentation

Journal Article Environmental Engineering Science · January 1, 2003 A Computational Fluid Dynamic (CFD) tool was used to evaluate the role of aggregate porosity on aggregate collisions due to differential sedimentation. This modeling study shows the influence of the hydrodynamics of porous aggregates on the rectilinear agg ... Full text Cite

Synthesis and characterization of Manganese doped ferroxane nanoparticles

Journal Article Materials Research Society Symposium - Proceedings · January 1, 2003 Ferroxane nanoparticles are precursors to iron oxide ceramic porous membranes. The ferroxane-derived ceramics have an average pore size of 24 nm and a surface area of 80 m2/g. Previous work has shown that these membranes have a molecular weight cut off of ... Full text Cite

Morphology of deposits formed from chemically heterogeneous suspensions: Application to membrane filtration

Journal Article Journal of Colloid and Interface Science · December 15, 2002 The morphology of fouling layers is an important factor in modeling permeate flux behavior in membrane filtration. In the present paper, the relationship between the chemical composition of suspension and the morphological properties of the deposit formed ... Full text Cite

X-ray absorption spectroscopy study of immobilization processes for heavy metals in calcium silicate hydrates. 2. Zinc

Journal Article Langmuir · June 12, 2002 Tricalcium silicate (C3S), the major phase of cement-based materials, contains naturally a few hundred parts per million of heavy metals. An X-ray absorption spectroscopy (XAS) study at the Zn K-edge has been carried out to elucidate the binding mechanisms ... Full text Cite

Synthesis and characterization of carboxylate - FeOOH nanoparticles (ferroxanes) and ferroxane-derived ceramics

Journal Article Chemistry of Materials · March 19, 2002 A new environmentally benign process for producing Fe-based ceramics of variable properties is presented. We have demonstrated that the reaction between lepidocrocite and acetic acid (=AA) in water results in the formation of carboxylate-FeOOH nanoparticle ... Full text Cite

Constant transmembrane pressure vs. constant permeate flux: Effect of particle size on crossflow membrane filtration

Journal Article Environmental Engineering Science · January 1, 2002 A series of membrane filtration experiments was carried out in a crossflow flat slit geometry to study permeate flux dependence on particle size and operational mode. Dilute monodisperse suspensions of polystyrene particles 20, 50, 100, and 680 nm in diame ... Full text Cite

Membrane separations in aquatic systems

Journal Article Environmental Engineering Science · January 1, 2002 Full text Cite

Characteristics of ultrafiltration ceramic membranes derived from alumoxane nanoparticles

Journal Article Journal of Membrane Science · January 1, 2002 Alumoxanes nanoparticles were cast onto α-alumina supports by slip-coating to develop asymmetric ultrafiltration ceramic membranes. Membrane layers as thin as 1 or 2μm were achieved. The effect of sintering conditions was investigated. Membrane surface mor ... Full text Cite

Application of strontium isotopes for tracing landfill leachate plumes in groundwater.

Journal Article Environmental science & technology · December 2001 We are evaluating strontium isotopes as alternative tracers of landfill leachate in groundwater. The municipal landfill studied here is located in southeastern France. This landfill has no bottom liner, and wastes are placed directly on the ground. Based o ... Full text Cite

Alumina ultrafiltration membranes derived from carboxylate-alumoxane nanoparticles

Journal Article Journal of Membrane Science · November 15, 2001 The fabrication of asymmetric alumina ultrafiltration membranes using acetic acid surface stabilized alumina nanoparticles (A-alumoxanes) has been investigated. Contacting α-alumina supports with an aqueous solution of A-alumoxane (after firing to 1000°C) ... Full text Cite

Flocs restructuring during Aggregation: Experimental evidence and numerical simulation

Journal Article Journal of Colloid and Interface Science · November 1, 2001 Aggregate structure, i.e., fractal dimension, has a coupled geometric and hydrodynamic impact on the aggregate collision frequencies. In this work, we evaluated different collision frequency kernel calculation schemes to simulate experimentally determined ... Full text Cite

Optimization of hollow-fiber design and low-pressure membrane system operation

Journal Article Journal of Environmental Engineering · June 1, 2001 An approach is presented for the numerical optimization of low-pressure membrane filtration processes. A multidimensional optimization of an ultrafiltration system is formulated for cost minimization and numerically solved for key optimal design and operat ... Full text Cite

Effect of collision efficiency on the evolution of the surface of diffusion-limited deposits

Journal Article Journal of Colloid and Interface Science · May 1, 2001 The effect of the collision efficiency of particles deposited onto a rough substrate and the evolution of the deposit profile were investigated using 2D on-lattice Monte Carlo simulations. The case of a diffusive long-range transport regime as representati ... Full text Cite

Transient permeate flux analysis: Model validation

Journal Article Water Science and Technology: Water Supply · January 1, 2001 An extended model integrating several particle back-transport theories has been proposed by Sethi and Wiesner to predict transient permeate flux as a function of operational parameters for constant permeate flux (CF) and constant transmembrane pressure (CP ... Full text Cite

Optimization of hollow-fiber design and low-pressure membrane system operation

Journal Article Journal of Environmental Engineering · 2001 An approach is presented for the numerical optimization of low-pressure membrane filtration processes. A multidimensional optimization of an ultrafiltration system is formulated for cost minimization and numerically solved for key optimal design and operat ... Full text Link to item Cite

Morphology of membrane deposits

Journal Article ACS Division of Environmental Chemistry, Preprints · August 20, 2000 Cite

Characterization of alumoxane-derived ceramic membranes

Journal Article Journal of Membrane Science · August 15, 2000 Atomic force microscopy, nitrogen adsorption-desorption, and measurements of intrinsic permeability are used to characterize ceramic membranes made using a newly developed alumoxane-based method conceived as an environmentally benign process. AFM, BET and ... Full text Cite

Simulated cost comparisons of hollow-fiber and integrated nanofiltration configurations

Journal Article Water Research · June 15, 2000 Treatment costs and cost effectiveness of a hollow-fiber nanofiltration (HFNF) system vs. an integrated system comprised of spiral-wound nanofiltration (SWNF) pre-treated with hollow-fiber ultrafiltration (HFUF) are estimated and compared using numerical s ... Full text Cite

A comparison of rotating and stationary membrane disk filters using computational fluid dynamics

Journal Article Journal of Membrane Science · January 17, 2000 For given values of the flow rate and RPM, stationary membrane disk filters require less power input. Rotating membrane disk filters produce a higher shear stress on the membrane surface which may reduce fouling but may also result in a reversed flow of pe ... Full text Cite

Particle fouling of a rotating membrane disk

Journal Article Water Research · January 1, 2000 Fouling of rotating disk membranes as function of operating conditions and feed suspension characteristics was investigated in a series of laboratory experiments. A single-disk laboratory unit was operated over a range of disk rotation speeds and permeatio ... Full text Cite

Cost modeling and estimation of crossflow membrane filtration processes

Journal Article Environmental Engineering Science · January 1, 2000 A model is presented for estimating costs of crossflow ultrafiltration and microfiltration processes. The model incorporates separate correlations for several major components of capital costs, thus accounting for different economies of scale associated wi ... Full text Cite

Morphology of particle deposits

Journal Article Journal of Environmental Engineering · December 1, 1999 The premise that the morphology of deposits formed from colloids, aerosols, and other particulate materials can be predicted from their transport properties and surface chemistries is explored. Universality classes that group the conditions of particles in ... Full text Cite

The promise of membrane technologies

Journal Article Environmental Science and Technology · September 1, 1999 Cite

Analysis of colloidal phases in urban stormwater runoff

Journal Article Environmental Science and Technology · March 15, 1999 The composition and morphology of colloidal materials entering an urban waterway (Brays Bayou, Houston, U.S.A.) during a storm event was investigated. Analyses of organic carbon, Si, Al, Fe, Cr, Cu, Mn, Zn, Ca, Mg, and Ba were performed on the fraction of ... Full text Cite

Rotating membrane disk filters: Design evaluation using computational fluid dynamics

Journal Article Chemical Engineering Journal · January 29, 1999 Computational fluid dynamics is used to investigate designs for rotating membrane disk filters. Simulations have been run for the case of water permeating through a membrane disk rotating in a pressurized housing. The water was assumed to be Newtonian, inc ... Full text Cite

Morphology of particle deposits

Journal Article Journal of Environmental Engineering · 1999 The premise that the morphology of deposits formed from colloids, aerosols, and other particulate materials can be predicted from their transport properties and surface chemistries is explored. Universality classes that group the conditions of particles in ... Full text Link to item Cite

Determination of structure of aggregates by confocal scanning laser microscopy

Journal Article Journal of Colloid and Interface Science · August 15, 1998 The fractal dimension of a particle aggregate can provide fundomental information on the structure and origin of the aggregate. The analysis of large chemically homogeneous fractal objects has been achieved, but reliable methods of estimating the fractal d ... Full text Cite

Committee report: Membrane processes

Journal Article Journal - American Water Works Association · June 1, 1998 Researchers are tackling issues related to larger modules and plants, pretreatment, permitting, and disposal of residuals. ... Full text Cite

Multifractal analysis of particle size distributions in soil

Journal Article Environmental Science and Technology · May 1, 1998 Power-law scaling of particle size distributions in air, water, and soil have been frequently reported and are sometimes interpreted in the context of a fractal dimension to yield estimates of the geometrical characteristics of particles and aggregates suc ... Full text Cite

Dialysis investigations of atrazine-organic matter interactions and the role of a divalent metal

Journal Article Environmental Science and Technology · January 15, 1998 Contamination of surface and groundwaters by atrazine is a problem for water utilities in the United States and Europe. Though not removed by traditional liquid-solid separation, it is removed by nanofiltration. Retention of atrazine by a series of dialysi ... Full text Cite

Evaluation of crossflow filtration models based on shear-induced diffusion and particle adhesion: Complications induced by feed suspension polydispersivity

Journal Article Journal of Membrane Science · January 7, 1998 Specific flux data were obtained during the transient period of flux decline in laminar crossflow filtration. Effects of hydrodynamics on cake parameters such as specific resistance, mass and particle size distribution were studied experimentally. An evalu ... Full text Cite

Effects of natural organic matter and the raw water matrix on the rejection of atrazine by pressure-driven membranes

Journal Article Water Research · January 1, 1998 This work explores the role of the raw water matrix, particularly natural organic matter (NOM), in determining the removal of atrazine by nanofiltration membranes. The nature and relative concentration of NOM, the presence of calcium and ionic strength aff ... Full text Cite

Estimating costs for integrated membrane systems

Journal Article Journal / American Water Works Association · 1998 Nanofiltration (NF) costs attributable to variations in chemical cleaning intervals (resulting from changes in permeate flux and feedwater recovery) were estimated based on membrane fouling rates, associated cleaning intervals, backwashing frequencies, per ... Cite

Estimating costs for integrated membrane systems: Despite greater NF fouling rates, life cycle costs for membrane facilities appear to be reduced when membranes are operated at higher permeate fluxes and feedwater recoveries

Journal Article Journal / American Water Works Association · January 1, 1998 Nanofiltration (NF) costs attributable to variations in chemical cleaning intervals (resulting from changes in permeate flux and feedwater recovery) were estimated based on membrane fouling rates, associated cleaning intervals, backwashing frequencies, per ... Full text Cite

Modeling of transient permeate flux in cross-flow membrane filtration incorporating multiple particle transport mechanisms

Journal Article Journal of Membrane Science · December 10, 1997 Dominant mechanisms of particle transport in cross-flow membrane filtration are unified to obtain a generalized model for time-dependent permeate flux. The unified model extends an earlier model based on shear-induced diffusion and a concentrated flowing l ... Full text Cite

Deposit morphology and head loss development in porous media

Journal Article Environmental Science and Technology · October 1, 1997 Experimental observations of monodispersed latex particles filtered through a bed of spherical glass beads indicated that flow ram plays an important role in head loss development by influencing the morphology of the deposits as well as the deposit distrib ... Full text Cite

Editorial

Journal Article Journal of Environmental Engineering (United States) · September 1, 1997 Full text Cite

Particle back-transport and permeate flux behavior in crossflow membrane filters

Journal Article Environmental Science and Technology · March 1, 1997 Particle residence time distributions in a membrane channel are interpreted to elucidate mechanisms of particle transport end colloidal fouling in membrane filtration. A comparison of particle size distributions in the membrane feed suspensions and deposit ... Full text Cite

Ultrafiltration of water generated in oil and gas production

Journal Article Water Environment Research · January 1, 1997 Produced water from gas and oil operations is purportedly the largest single source of waste generated in the U.S., with an annual production rate of more than 2.7 bil t (3 bil ton). Results are presented from bench-scale pilot tests of membrane ultrafiltr ... Full text Cite

Particles, metals, and water quality in runoff from large urban watershed

Journal Article Journal of Environmental Engineering · January 1, 1997 Water quality, metals concentration, and particle size distributions were characterized in urban runoff. The distribution of metals in the macrocolloidal (0.45-20 μm) and dissolved (<0.45 μm) size fractions was determined from samples taken under both stor ... Full text Cite

Aqueous Synthesis of Water-Soluble Alumoxanes: Environmentally Benign Precursors to Alumina and Aluminum-Based Ceramics

Journal Article Chemistry of Materials · January 1, 1997 The objective of our research is the development of an environmentally benign process for the fabrication of alumina-based ceramics. We have designed an alternative synthetic pathway to alumina ceramics that does not utilize toxic reagents or volatile orga ... Full text Cite

Editorial

Journal Article Journal of Environmental Engineering (United States) · February 1, 1996 Full text Cite

Hydrodynamics of fractal aggregates with radially varying permeability

Journal Article Journal of Colloid and Interface Science · January 15, 1996 Hydrodynamic properties of fractal aggregates with radially varying permeability are investigated in terms of two parameters: radius of equivalent solid sphere experiencing the same drag as the aggregate (Ω* radius of aggregate) and fluid collection effici ... Full text Cite

Microfiltration of oil-in-water emulsions

Journal Article Water Environment Research · January 1, 1996 Effects of transmembrane pressure and membrane pore size on the microfiltration of oil-in-water emulsions are reported. A model for calculating the critical pressure required to force the entry of an oil drop into a membrane pore is formulated based on the ... Full text Cite

Reduced permeability in groundwater remediation systems: Role of mobilized colloids and injected chemicals

Journal Article Environmental Science and Technology · January 1, 1996 The success of pump-and-treat or in situ remediation of contaminated aquifers depends in part on the ability to maintain the permeability of the aquifer, withdrawal wells, and delivery systems at a reasonable cost while moving significant quantities of wat ... Full text Cite

Editor's Note

Journal Article Journal of Environmental Engineering (United States) · January 1, 1995 Full text Cite

Performance and cost modeling of ultrafiltration

Journal Article Journal of Environmental Engineering · 1995 Models describing permeate flux, rejection, and cost are coupled to evaluate the performance and cost of ultrafiltration as a function of raw-water quality. The model for permeate flux extends a previous model for colloidal fouling based on shear-induced d ... Full text Link to item Cite

Performance and cost modeling of ultrafiltration

Journal Article Journal of Environmental Engineering (United States) · January 1, 1995 Models describing permeate flux, rejection, and cost are coupled to evaluate the performance and cost of ultrafiltration as a function of raw-water quality. The model for permeate flux extends a previous model for colloidal fouling based on shear-induced d ... Full text Cite

Laminar flow in porous ducts

Journal Article Reviews in Chemical Engineering · January 1, 1995 A review of theoretical and experimental investigations of laminar fluid flow in porous ducts is presented. We extend the analysis of Terrill (1964) to derive similarity solutions for axial and lateral velocity profiles, pressure gradients and wall skin fr ... Full text Cite

pH and ionic strength effects on the performance of ceramic membranes in water filtration

Journal Article Journal of Membrane Science · August 8, 1994 The effects of pH and ionic strength on the performance of ceramic microfiltration membranes are evaluated. An α-alumina membrane, characterized by a 0.8 μm nominal pore diameter, was operated in a crossflow configuration with three types of feed waters: p ... Full text Cite

Editorial: Alternative disinfection: Retrospective and future challenges

Journal Article Journal of Environmental Engineering (United States) · January 1, 1994 Full text Cite

Particle deposition on an infinitely permeable surface dependence of deposit morphology on particle size

Journal Article Journal of Colloid And Interface Science · January 1, 1994 Monte Carlo simulations of colloid deposition on a one-dimensional permeable surface from a uniform flow field are reported. The effects of particle size, fluid velocity, and particle density on the transport of particles to the collector surface by fluid ... Full text Cite

Cost estimates for membrane filtration and conventional treatment

Journal Article Journal / American Water Works Association · January 1, 1994 Cost of several ultrafiltration and nanofiltration processes are compared with the cost of conventional liquid-solid separation with or without GAC adsorption for small facilities. Data on raw-water quality, permeate flux, recovery, frequency of backflushi ... Full text Cite

Laminar flow with slip in channels with uniformly porous walls

Journal Article Journal of Hydraulic Engineering · January 1, 1993 Full text Cite

Cost model for low-pressure membrane filtration

Journal Article Journal of Environmental Engineering (United States) · January 1, 1993 A model for capital and operating costs of low-pressure membrane filtration is presented. The model is used to explore the impact of variables describing system operation and membrane characteristics on treatment costs as well as to compare the cost of tre ... Full text Cite

Fluid mechanics and fractal aggregates

Journal Article Water Research · January 1, 1993 The disturbances in uniform creeping flow in the presence of an isolated porous floc are investigated theoretically. Using the Carman-Kozeny equation, the floc permeability is related to its fractal dimension, D. Fluid streamlines, drag coefficient and the ... Full text Cite

Role of suspension polydispersivity in granular media filtration

Journal Article Journal of Environmental Engineering (United States) · January 1, 1993 Experimental work on the role of feed suspension polydispersivity on the performance of granular media filters is presented. Suspensions of latex particles of sizes 0.09 μm, 0.944 μm, 7.04 μm, and 7.6 um, and their paired combinations were filtered through ... Full text Cite

Slip flow through porous media with permeable boundaries: Implications for the dimensional scaling of packed beds

Journal Article Water Environment Research · January 1, 1993 A theoretical description of single-phase flow through porous media having permeable boundaries is presented. The volume averaged momentum transfer equation is solved numerically by a finite difference technique after neglecting the nonlinear inertia term. ... Full text Cite

Slip at a uniformly porous boundary: effect on fluid flow and mass transfer

Journal Article Journal of Engineering Mathematics · November 1, 1992 An approximate solution to the 2-D Navier-Stokes equations for steady, isothermal, incompressible, laminar flow in a channel bounded by one porous wall subject to uniform suction is derived. The solution is valid for small values of the Reynolds number bas ... Full text Cite

Particle Transport in Clean Membrane Filters in Laminar Flow

Journal Article Environmental Science and Technology · August 1, 1992 Particle transport and deposition studies in laminar cross-flow membrane filtration are reported. Particle residence time distributions (RTDs) in experimental conditions typical of ultra- and microfiltration are compared with theoretical predictions incorp ... Full text Cite

Effect of delaying the addition of polymeric coagulant-aid on settled water turbidity

Journal Article Water Science and Technology · January 1, 1992 The effect of polymeric coagulant aids and the time of their addition relative to the addition of the primary metal coagulants was investigated in a series of jar tests. Solutions of humic acid were coagulated using iron and aluminum coagulants in conjunct ... Full text Cite

Mass transport considerations for pressure-driven membrane processes

Journal Article Journal / American Water Works Association · January 1, 1992 Numerical simulations and experimental work for evaluating transport mechanisms for colloidal foulants in pressure-driven membrane systems are discussed. A model for concentration polarization is used to explore the role of ionic strength in determining th ... Full text Cite

Kinetics of aggregate formation in rapid mix

Journal Article Water Research · January 1, 1992 The growth of porous aggregates during initial mixing is investigated in a series of numerical simulations. Hydrodynamic radii of aggregates composed of i primary particles are used to calculate collision rate constants as a function of fractal dimension, ... Full text Cite

Pilot evaluation of ceramic membranes in surface water treatment with coagulant pretreatment

Journal Article Water Science and Technology · January 1, 1992 Results from a pilot scale study on the performance of ceramic membranes in treating high turbid waters are presented. Coagulation pretreatment using alum or ferric sulfate was found to improve permeate quality and increase permeate flux. In comparison wit ... Full text Cite

Committee report. Membrane processes in potable water treatment

Journal Article Journal / American Water Works Association · January 1, 1992 Membrane technology is a process that has not been widely used in potable water treatment, except for reverse osmosis applications. Because of increasingly stringent regulations, this technology is being examined for the potential application of ultrafiltr ... Full text Cite

Macrocolloidal transport in membrane filters in slow laminar flows: Polarization chromatography

Journal Article Water Science and Technology · January 1, 1992 Particle transport in crossflow membrane filters is the result of complex interactions originating from module hydrodynamics, suspension chemistry and external forces. Experimental and theoretical investigations of particle transport in dilute suspensions ... Full text Cite

Coagulation-flocculation with aluminium salts: Influence on the filtration efficacy with microporous membranes

Journal Article Water Research · January 1, 1992 Membrane fouling in crossflow microfiltration of coagulated synthetic raw water has been studied in order to evaluate the influence of aluminium coagulant in the filtration liquid-solid separation. The presence of small colloids leads to a fast fouling of ... Full text Cite

Filtration of polydisperse suspensions

Journal Article Proceedings - AWWA Annual Conference · December 1, 1991 The effect of particle polydispersivity in the influent suspension to granular media filters has been studied experimentally. Suspensions of spherical latex particles of sizes 0.09 μm, 0.944 μm and 7.04 μm were filtered through a porous bed of glass sphere ... Cite

Mass transport and colloidal fouling in pressure-driven membrane processes. Considerations in potable water treatment

Journal Article Proceedings - AWWA Annual Conference · December 1, 1991 Pressure-driven membrane processes include reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF) and microfiltration (MF). Inherent in all of these membrane separation processes is the accumulation of rejected materials near the membrane surface. ... Cite

Microbial transport through porous media: The effects of hydraulic conductivity and injection velocity

Journal Article Journal of Hazardous Materials · January 1, 1991 The effects of hydraulic conductivity and injection velocity on microbial transport through porous media were investigated. Glass chromatography columns were packed separately with clean quartz sand of two diameters (0.368mm or 0.24O mm) and two hydraulic ... Full text Cite

Fouling in tangential-flow ultrafiltration: The effect of colloid size and coagulation pretreatment

Journal Article Journal of Membrane Science · September 1, 1990 The fouling characteristics of dispersions of dissolved organic materials and colloids are investigated in a series of ultrafiltration experiments. Dispersions of tannic acid, humic acid and kaolin are filtered using a cross-flow hollow fiber module. In so ... Full text Cite

Raw water characteristics and the selection of treatment configurations for particle removal

Journal Article Journal / American Water Works Association · January 1, 1989 The particle-removal performance of several full-scale water treatment plants is evaluated using a systems analysis approach. Sources of particle-volume concentration in raw water are discussed, and it is suggested that 'dissolved' organic materials in raw ... Full text Cite

Membrane filtration of coagulated suspensions

Journal Article Journal of Environmental Engineering (United States) · January 1, 1989 The deposition of small colloids or macromolecules in membrane pores and the subsequent irreversible fouling of the membrane is considered using a simple model for membrane fouling. As a strategy for avoiding pore fouling, it is proposed that foulants capa ... Full text Cite

Optimal water treatment plant design

Journal Article Journal of Environmental Engineering (United States) · January 1, 1987 The identification of a least cost design and configuration of unit processes for particle removal in water treatment is formulated as a nonlinear optimization program. Simulation models describing changes in particle size and concentration enter into the ... Full text Cite

OPTIMIZING THE PLACEMENT OF GAC FILTRATION UNITS.

Journal Article Journal / American Water Works Association · January 1, 1987 The costs of granular activated carbon (GAC) filter-adsorbers (second-stage GAC filtration) were compared with those of the sand replacement option (first-stage GAC filtration). Simulation models of total organic carbon (TOC) adsorption and particle remova ... Full text Cite

COST OF CONTACT FILTRATION AS A FUNCTION OF THE RAW WATER PARTICLE SIZE DISTRIBUTION.

Journal Article · December 1, 1986 An optimization model was used to identify least cost contact filtration designs of filtration rate and runtime as a function of raw water particle concentration and average diameter. The optimization model incorporates a previously developed simulation mo ... Cite

COST OPTIMAL FILTRATION DESIGN.

Journal Article National Conference on Environmental Engineering · January 1, 1984 Cite

Pesticide transport and bioconcentration model

Journal Article Journal of Environmental Engineering (United States) · January 1, 1983 Full text Cite