Effect of Siderophore DFOB on U(VI) Adsorption to Clay Mineral and Its Subsequent Reduction by an Iron-Reducing Bacterium
| Autor: | Limin Zhang, Hailiang Dong, Runjie Li, Dong Liu, Liang Bian, Yu Chen, Zezhen Pan, Maxim I. Boyanov, Kenneth M. Kemner, Jianguo Wen, Qingyin Xia, Hongyu Chen, Edward J. O’Loughlin, Guanyu Wang, Ying Huang |
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| Přispěvatelé: | Qingyin Xia, Jianguo Wen, Zezhen Pan |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Environmental Science & Technology. 56:12702-12712 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.2c02047 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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