期刊
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
卷 242, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2021.106798
关键词
Uranium; Montmorillonite; Shewanella oneidensis MR-1; Deep geological repositories; Radioactive waste
资金
- National Key Research and Development Program of China [2017YFA0207002]
- National Natural Science Foundation of China [21906052, U2067215]
- Research Fund Program of Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources [2017B030314182]
The study found that Shewanella oneidensis MR-1 bacteria significantly enhanced the removal efficiency of U(VI) by montmorillonite, leading to improvements in adsorption type and capacity, likely through reduction reactions.
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.
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