文献类型：期刊文献

英文题名：Effect of Shewanella oneidensis MR-1 on U(VI) sequestration by montmorillonite

作者：Wang, Shuqin[1];Shi, Lei[2];Yu, Shujun[1,2];Pang, Hongwei[2];Qiu, Muqing[1];Song, Gang[4];Fu, Dong[3];Hu, Baowei[1];Wang, Xiangxue[3]

机构：[1]Shaoxing Univ, Sch Life Sci, Shaoxing 312000, Peoples R China;[2]North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China;[3]North China Elect Power Univ, Dept Environm Sci & Engn, Hebei Key Lab Power Plant Flue Gas Multipollutant, Baoding 071003, Peoples R China;[4]Guangzhou Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Peoples R China

年份：2022

卷号：242

外文期刊名：JOURNAL OF ENVIRONMENTAL RADIOACTIVITY

收录：SCI-EXPANDED(收录号：WOS:000737782900002)、、WOS

基金：This work was supported by National Key Research and Development Program of China (2017YFA0207002), the National Natural Science Foundation of China (21906052, U2067215), the Research Fund Program of Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources (2017B030314182).

语种：英文

外文关键词：Uranium; Montmorillonite; Shewanella oneidensis MR-1; Deep geological repositories; Radioactive waste

外文摘要：Bacteria may change the physicochemical properties of montmorillonite and further effect the disposal of highlevel radioactive waste. Therefore, we explored the influence of Shewanella oneidensis MR-1 on the elimination of representative radionuclide U(VI) by montmorillonite (MMT). The batch experiments showed that MR-1 significantly enhanced the removal efficiency of U(VI), the adsorption capacity of MMT improved from 8.4 to 16.1 mg/g after addition of MR-1, and the adsorption type changed from Langmuir to Freundlich. FTIR and XPS analysis revealed that hydroxyl, phosphate, carbonyl and amine in MMT + MR-1 were primary actors in the elimination of U(VI). The U 4f high-resolution XPS spectrum of MMT + MR-1 showed U(VI) and U(IV) peaks at the same time, indicating that the adsorption process was accompanied by the reduction reaction, which may be due to the extracellular respiration of MR-1. These investigations are significant to insight the potential significance of microbial processes for the transport and elimination of U(VI) in repositories, which in return will contribute to their safe disposal.