Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 9, Pages 5476-5483Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es506363x
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Funding
- National Science Foundation's Environmental Chemical Science Program [CHE-1214090]
- Washington University's Faculty Startup
- Environmental Protection Agency STAR Fellowship
- Mr. and Mrs. Spencer T. Olin Fellowship
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- National Science Foundation-Earth Sciences [EAR-1128799]
- Department of Energy-GeoSciences [DE-FG02-94ER14466]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1214090] Funding Source: National Science Foundation
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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. 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.
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