Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 329, Issue 3, Pages 1555-1569Publisher
SPRINGER
DOI: 10.1007/s10967-021-07919-1
Keywords
Uranium (U); Desorption; Minerals; Shewanella putrefaciens; Extracellular polymeric substances (EPS)
Funding
- National Natural Science Foundation of China [21571163, 21407133, 41402248, 51608498]
- China Academy of Engineering Physics [TP03201601]
- National Key R&D Program of China [2019YFC1803500, 2019YFC1803504]
- key research and development projects of Sichuan science and technology department [2018SZ0298]
- Scientific research project of Sichuan education department [16ZB0150]
- Nuclear Facility Decommissioning and radioactive waste treatment research project of the State Administration of science, technology and industry of national defense (second division of science and Technology) [1521 [2018]]
- Longshan academic research talent support program of Southwest University of Science and Technology [18LZX309, 17LZX613, 18LZX638, 18LZXT03]
- Southwest University of Science and Technology Natural Science Foundation [18zx7125]
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The desorption of U(VI) from minerals by microorganisms and their extracellular polymeric substances (EPS) was significantly influenced by the presence of EPS, which competed with bacterial cells for adsorption sites and facilitated the formation of stable complexes. The desorption process of U(VI) on minerals was found to be a complex heterogeneous diffusion and chemical desorption process.
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 alpha-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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