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Title: Enhanced Colloidal Stability of CeO2 Nanoparticles by Ferrous Ions: Adsorption, Redox Reaction, and Surface Precipitation

Journal Article · · Environmental Science and Technology
DOI:https://doi.org/10.1021/es506363x· OSTI ID:1186925

Due to the toxicity of cerium oxide (CeO2) nanoparticles (NPs), a better understanding of the redox reaction-induced surface property changes of CeO2 NPs and their transport in natural and engineered aqueous systems is needed. As such, this study investigates the impact of redox reactions with ferrous ions (Fe2+) on the colloidal stability of CeO2 NPs. We demonstrated that under anaerobic conditions, suspended CeO2 NPs in a 3 mM FeCl2 solution at pH 4.8 were much more stable against sedimentation than those in the absence of Fe2+. Redox reactions between CeO2 NPs and Fe2+ lead to the formation of 6-line ferrihydrite on the CeO2 surfaces, which enhanced the colloidal stability by increasing the zeta potential and hydrophilicity of CeO2 NPs. These redox reactions can affect the toxicity of CeO2 NPs by increasing cerium dissolution, and by creating new Fe(III) (hydr)oxide reactive surface layers. Thus, these findings have significant implications for elucidating the phase transformation and transport of redox reactive NPs in the environment.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); USEPA; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-06CH11357; FG02-94ER14466
OSTI ID:
1186925
Journal Information:
Environmental Science and Technology, Vol. 49, Issue 9; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (5)

Synthesis, characterization, and ecotoxicity of CeO2 nanoparticles with differing properties journal October 2016
Tuning porous nanostructures of MnCo 2 O 4 for application in supercapacitors and catalysis journal January 2016
Co-effects of UV/H 2 O 2 and natural organic matter on the surface chemistry of cerium oxide nanoparticles journal January 2018
Redox chemistry of CeO 2 nanoparticles in aquatic systems containing Cr( vi )(aq) and Fe 2+ ions journal January 2019
Antioxidant activity of cerium dioxide nanoparticles and nanorods in scavenging hydroxyl radicals journal January 2019