期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 17, 页码 12702-12712出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c02047
关键词
Shewanella putrefaciens CN32; Fe(III) reduction; U(VI) reduction; nontronite; siderophore DFOB
资金
- National Natural Science Foundation of China [41630103, 41872039, 41831285]
- Argonne Wetlands Hydrobiogeochemistry Scientific Focus Area - Environmental System Science Program, Office of Biological and Environmental Research
- Argonne Wetlands Hydrobiogeochemistry Scientific Focus Area - Environmental System Science Program, Office of Biological and Environmental Research
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
Previous studies focused on bioreduction of uranium (VI) as a remediation method, but uranium (IV) can be reoxidized and remobilized. In this study, a combination of adsorption and bioreduction of U (VI) in the presence of an organic ligand and a Fe-rich clay mineral was found to partially solve this problem. The results provide novel insights into the mechanisms of U(VI) bioreduction and the stability of U.
Uranium mining and nuclear fuel production have led to significant U contamination. Past studies have focused on the bioreduction of soluble U(VI) to insoluble U(IV) as a remediation method. However, U(IV) is susceptible to reoxidation and remobilization when conditions change. Here, we demonstrate that a combination of adsorption and bioreduction of U(VI) in the presence of an organic ligand (siderophore desferrioxamine B, DFOB) and the Fe-rich clay mineral nontronite partially alleviated this problem. DFOB greatly facilitated U(VI) adsorption into the interlayer of nontronite as a stable U(VI)-DFOB complex. This complex was likely reduced by bioreduction intermediates such as the Fe(II)-DFOB complex and/or through electron transfer within a ternary Fe(II)-DFOB-U(VI) complex. Bioreduction with DFOB alone resulted in a mobile aqueous U(IV)-DFOB complex, but in the presence of both DFOB and nontronite U(IV) was sequestered into a solid. These results provide novel insights into the mechanisms of U(VI) bioreduction and the stability of U and have important implications for understanding U biogeochemistry in the environment and for developing a sustainable U remediation approach.
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