文献类型：期刊文献

英文题名：Removal of hexavalent uranium [U(VI)] by magnetite in the presence of metal-reducing bacteria from rice soil

作者：Luo, Chunhui[1];Zhang, Tingting[1,2];Yuan, Zongdi[1];Fu, Zheng[1];Lv, Shuo[1];Huang, Chengcai[1];Hu, Baowei[1];Zhu, Yuling[1];Zheng, Bin[3]

机构：[1]Shaoxing Univ, Sch Life Sci, Sch Civil Engn, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[3]Nanjing Forestry Univ, Coll Econ & Management, 159 Longpan Rd, Nanjing 210037, Jiangsu, Peoples R China

年份：2022

卷号：28

外文期刊名：ENVIRONMENTAL TECHNOLOGY & INNOVATION

收录：SCI-EXPANDED(收录号：WOS:000837901400016)、、EI(收录号：20221912096507)、Scopus(收录号：2-s2.0-85129538500)、WOS

基金：This work was financially supported by the National Natural Science Foundation of China (Grant No. 71603118).

语种：英文

外文关键词：U(VI); Magnetite; Metal-reducing bacteria; Reduction; Passivation

外文摘要：Magnetite is often associated with U(VI) in uranium (U) contaminated soils. In-situ reduction of U(VI) with magnetite has been demonstrated as a cost-effective method to remedy U pollution in the subsurface. While, the results indicate that surface passivation of magnetite may significantly affect the removal efficiency of U(VI). Hence, a mixed culture of metal-reducing bacteria, which consisted of different species in the genera of Bacillus, Clostridium XIV, Ochrobactrum, and Clostridium XI enriched from the rice soil, was employed to remove the passive film on the surface of magnetite. The results from the column experiments showed that the U(VI) removal efficiency increased from 41.8% to 93.4% after 150 days running in the presence of metal-reducing bacteria. Meanwhile, XRD and XPS analysis demonstrated that Fe(III) oxides were formed on the magnetite surface during the experiments. Furthermore, the selective bacteria also exhibited beneficiary ability in promoting the formation of UO2 associated with Fe-U mineral, FeUO4 in the reduction process. Nevertheless, it is noteworthy that among the four genera related to the Fe(III) and U(VI) reduction, only the genus of Ochrobactrum survived under the unsterilized condition with U(VI) and magnetite after 150 days. The existence of Ochrobactrum shows a vital contribution to the removal of U(VI), yet the underlying mechanism needs to be explored by further experiments. Along with this study, we expected that the screened metal-reducing bacteria enriched from rice soil, especially the genus of Ochrobactrum, may have potential in-situ applications in U(VI) contaminated sites. (C) 2022 The Author(s). Published by Elsevier B.V.