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Title: Uranium(VI) Reduction by Nanoscale Zerovalent Iron in Anoxic Batch Systems

This study investigated the influences of pH, bicarbonate, and calcium on U(VI) adsorption and reduction by synthetic nanosize zero valent iron (nano Fe0) particles under an anoxic condition. The results showed that about 87.1%, 82.7% and 78.3% of U(VI) could be reduced within 96 hours in the presence of 10 mM bicarbonate at pHs 6.92, 8.03 and 9.03, respectively. The rates of U(VI) reduction and adsorption by nano Fe0, however, varied significantly with increasing pH and concentrations of bicarbonate and/or calcium. Solid phase analysis by X-ray photoelectron spectroscopy confirmed the formation of UO2 and iron (hydr)oxides as a result of the redox interactions between adsorbed U(VI) and nano Fe0. This study highlights the potential important role of groundwater chemical composition in controlling the rates of U(VI) reductive immobilization using nano Fe0 in subsurface environments.
Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
993664
Report Number(s):
PNNL-SA-68628
Journal ID: ISSN 0013-936X; ESTHAG; 31295; KP1501040; TRN: US1008104
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science & Technology, 44(20):7783-7789; Journal Volume: 44; Journal Issue: 20
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACID CARBONATES; ADSORPTION; CALCIUM; CHEMICAL COMPOSITION; IRON; X-RAY PHOTOELECTRON SPECTROSCOPY zero valent iron, Uranium, adsorption, reduction, immobilization, nanoparticles; Environmental Molecular Sciences Laboratory