Desorption behavior of U(VI) from kaolinite and hematite by Shewanella putrefaciens cells and extracellular polymeric substances

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-Fe 2 O 3 as typical minerals. Based on the results, EPS contributed signi...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2021-09, Vol.329 (3), p.1555-1569
Main Authors: Huang, Feng-Yu, Zhang, Hai-Ling, Feng, Su, Ding, Huan-Huan, Cheng, Meng-Xi, Liu, Wei-Dong, Yi, Fa-Cheng, Wang, Zhe, Wang, Yong-Peng, Huang, He-Xiang
Format: Article
Language:English
Subjects:
Adsorption
Bacteria
Chemistry
Chemistry and Materials Science
Desorption
Diagnostic Radiology
Ethylenediaminetetraacetic acid
Hadrons
Heavy Ions
Hematite
Inorganic Chemistry
Kaolinite
Microorganisms
Minerals
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
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Summary: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-Fe 2 O 3 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.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-021-07919-1