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

Published

Journal Article

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 with bacteria followed by the subsequent reduction of Ce(IV) to Ce(III). Measurements of NP association with solids in sludge were combined with experimental estimates of reduction rate constants for CeO2 NPs in Monte Carlo simulations to predict the concentrations and speciation of Ce in WWTP effluents and biosolids. Experiments indicated preferential accumulation of CeO2 NPs in biosolids where reductive transformation would occur. Surface functionalization was observed to impact both the distribution coefficient and the rates of transformation. The relative affinity of CeO2 NPs for bacterial suspensions in sludge appears to explain differences in the observed rates of Ce reduction for the two types of CeO2 NPs studied.

Full Text

Duke Authors

Cited Authors

  • Barton, LE; Auffan, M; Olivi, L; Bottero, J-Y; Wiesner, MR

Published Date

  • August 2015

Published In

Volume / Issue

  • 203 /

Start / End Page

  • 122 - 129

PubMed ID

  • 25875163

Pubmed Central ID

  • 25875163

Electronic International Standard Serial Number (EISSN)

  • 1873-6424

International Standard Serial Number (ISSN)

  • 0269-7491

Digital Object Identifier (DOI)

  • 10.1016/j.envpol.2015.03.035

Language

  • eng