Abstract
The desorption of U(VI) from minerals by microorganisms and their extracellular polymeric substances (EPS) was characterized with Shewanella putrefaciens (S. putrefaciens) as a typical bacterial strain, while kaolinite and α-Fe2O3 as typical minerals. Based on the results, EPS contributed significantly to U(VI) desorption from minerals. Two kinds of mechanisms should be mainly involved in U(VI) desorption, including the competition for the adsorption sites of minerals between U(VI) and bacterial cells or EPS, and the formation of stable U(VI)–bacterial cells or U(VI)–EPS complexes. Desorption kinetics indicated that the desorption process of U(VI) on minerals was a complex heterogeneous diffusion and chemical desorption process.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (21571163, 21407133, 41402248 and 51608498), the sponsored research (TP03201601) from China Academy of Engineering Physics, National Key R&D Program of China (2019YFC1803500, 2019YFC1803504), the key research and development projects of Sichuan science and technology department (No: 2018SZ0298), the Scientific research project of Sichuan education department (No:16ZB0150), Nuclear Facility Decommissioning and radioactive waste treatment research project of the State Administration of science, technology and industry of national defense(NO.1521 [2018] of the second division of science and Technology), the Longshan academic research talent support program of Southwest University of Science and Technology (Nos. 18LZX309, 17LZX613, 18LZX638 and 18LZXT03), Southwest University of Science and Technology Natural Science Foundation (NO.18zx7125).
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ZW, Y-PW and H-XH designed experiments, and F-YH and H-LZ directly conducted experiments and wrote the manuscript. SF and H-HD performed experiments. M-XC, W-DL and F-CY helped with the experimentation. All authors read and approved the final manuscript.
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Huang, FY., Zhang, HL., Feng, S. et al. Desorption behavior of U(VI) from kaolinite and hematite by Shewanella putrefaciens cells and extracellular polymeric substances. J Radioanal Nucl Chem 329, 1555–1569 (2021). https://doi.org/10.1007/s10967-021-07919-1
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DOI: https://doi.org/10.1007/s10967-021-07919-1