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

Publication ,  Journal Article
Erdim, E; Badireddy, AR; Wiesner, MR
Published in: 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/or electron transfer to targeted contaminants, including waterborne pathogens under neutral pH conditions. Certain variations of the nano-composite were fabricated differing in the amounts of (1) ZVI (0.1mM and 2mM) but not nC60 (2.5mg-C/L), and (2) nC60 (0-25mg-C/L) but not ZVI (0.1mM). The generation of ROS by the ZVI/nC60 nano-composites and ZVI nanoparticles was quantified using organic probe compounds. 0.1mM ZVI/2.5mg-C/L C60 generated 3.74-fold higher O2(-) concentration and also resulted in an additional 2-log inactivation of Pseudomonas aeruginosa when compared to 0.1mM ZVI (3-log inactivation). 2mM ZVI/2.5mg-C/L nC60 showed negligible improvement over 2mM ZVI in terms of O2(-) generation or inactivation. Further, incremental amounts of nC60 in the range of 0-25mg-C/L in 0.1mM ZVI/nC60 led to increased O2(-) concentration, independent of UV-A. This study demonstrates that ZVI/nC60 device delivers (1) enhanced O2(-) with nC60 as a mediator for electron transfer, and (2) (1)O2 (only under UV-A illumination) at neutral pH conditions.

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Published In

Journal of hazardous materials

DOI

EISSN

1873-3336

ISSN

0304-3894

Publication Date

January 2015

Volume

283

Start / End Page

80 / 88

Related Subject Headings

  • Ultraviolet Rays
  • Superoxides
  • Strategic, Defence & Security Studies
  • Reactive Oxygen Species
  • Pseudomonas aeruginosa
  • Photosensitizing Agents
  • Nanoparticles
  • Iron
  • Hydrogen-Ion Concentration
  • Fullerenes
 

Citation

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Erdim, E., Badireddy, A. R., & Wiesner, M. R. (2015). Characterizing reactive oxygen generation and bacterial inactivation by a zerovalent iron-fullerene nano-composite device at neutral pH under UV-A illumination. Journal of Hazardous Materials, 283, 80–88. https://doi.org/10.1016/j.jhazmat.2014.08.049
Erdim, Esra, Appala Raju Badireddy, and Mark R. Wiesner. “Characterizing reactive oxygen generation and bacterial inactivation by a zerovalent iron-fullerene nano-composite device at neutral pH under UV-A illumination.Journal of Hazardous Materials 283 (January 2015): 80–88. https://doi.org/10.1016/j.jhazmat.2014.08.049.
Erdim, Esra, et al. “Characterizing reactive oxygen generation and bacterial inactivation by a zerovalent iron-fullerene nano-composite device at neutral pH under UV-A illumination.Journal of Hazardous Materials, vol. 283, Jan. 2015, pp. 80–88. Epmc, doi:10.1016/j.jhazmat.2014.08.049.
Journal cover image

Published In

Journal of hazardous materials

DOI

EISSN

1873-3336

ISSN

0304-3894

Publication Date

January 2015

Volume

283

Start / End Page

80 / 88

Related Subject Headings

  • Ultraviolet Rays
  • Superoxides
  • Strategic, Defence & Security Studies
  • Reactive Oxygen Species
  • Pseudomonas aeruginosa
  • Photosensitizing Agents
  • Nanoparticles
  • Iron
  • Hydrogen-Ion Concentration
  • Fullerenes