Journal
CHEMOSPHERE
Volume 117, Issue -, Pages 625-630Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2014.09.087
Keywords
Uranium(VI); NanoFe(0); Fe(II); Fe(III); Electron shuttle
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Funding
- National Natural Science Foundation of China [41303084, 40930743]
- opening research fund of Guangdong Province & MOE Key Laboratory of Water Safety and Protection of Pearl River Delta [GZ201101]
- U.S. Department of Energy's Joint EPA
- NSF
- DOE program on Nanotechnology in the Office of Biological and Environmental Research (BER)
- U.S. National Science Foundation [CBET-0828411]
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The role of Fe(II) and Fe(III) in U(VI) reduction by nanoscale zerovalent iron (nanoFe(0)) was investigated using two iron chelators 1,10-phenanthroline and triethanolamine (TEA) under a CO2-free anoxic condition. The results showed that U(VI) reduction was strongly inhibited by 1,10-phenanthroline and TEA in a pH range from 6.9 to 9.0. For instance, at pH 6.9 the observed U(VI) reduction rates decreased by 81% and 82% in the presence of 1,10-phenanthroline and TEA, respectively. The inhibition was attributed to the formation of stable complexes between 1,10-phenanthroline and Fe(II) or TEA and Fe(III). In the absence of iron chelators, U(VI) reduction can be enhanced by surface-bound Fe(II) on nanoFe(0). Our results suggested that Fe(III) and Fe(II) possibly acted as an electron shuttle to ferry the electrons from nanoFe to U(VI), therefore a combined system with Fe(II), Fe(III) and nanoFe could facilitate U(VI) reductive immobilization in the contaminated groundwater. (C) 2014 Elsevier Ltd. All rights reserved.
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