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Dong X, Yan Q, Wang Z, Feng X, Chen J, Xu C. Group Separation of Hexavalent Actinides from Lanthanides through Selective Extraction by Sterically Hindered 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xue Dong
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Qiang Yan
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Zhipeng Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Xiaogui Feng
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
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Ding L, Tan WF, Xie SB, Mumford K, Lv JW, Wang HQ, Fang Q, Zhang XW, Wu XY, Li M. Uranium adsorption and subsequent re-oxidation under aerobic conditions by Leifsonia sp. - Coated biochar as green trapping agent. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 242:778-787. [PMID: 30031311 DOI: 10.1016/j.envpol.2018.07.050] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 07/11/2018] [Accepted: 07/11/2018] [Indexed: 06/08/2023]
Abstract
It has generally been assumed that the immobilization of U(VI) via polyphosphate accumulating microorganisms may present a sink for uranium, but the potential mechanisms of the process and the stability of precipitated uranium under aerobic conditions remain elusive. This study seeks to explore the mechanism, capacity, and stability of uranium precipitation under aerobic conditions by a purified indigenous bacteria isolated from acidic tailings (pH 6.5) in China. The results show that over the treatment ranges investigated, maximum removal of U(VI) from aqueous solution was 99.82% when the initial concentration of U(VI) was 42 μM, pH was 3.5, and the temperature was with 30 °C much higher than that of other reported microorganisms. The adsorption mechanism was elucidated via the use of SEM-EDS, XPS and FTIR. SEM-EDS showed two peaks of uranium on the surface. A plausible explanation for this, supported by FTIR, is that uranium precipitated on the biosorbent surfaces. XPS measurements indicated that the uranium product is most likely a mixture of 13% U(VI) and 87% U(IV). Notably, the reoxidation experiment found that the uranium precipitates were stable in the presence of Ca2+ and Mg2+, however, U(IV) is oxidized to U(VI) in the presence of NO3- and Na+ ions, resulting in rapid dissolution. It implies that the synthesized Leifsonia sp. coated biochar could be utilized as a green and effective biosorbent. However, it may not a good choice for in-situ remediation due to the subsequent re-oxidation under aerobic conditions. These observations can be of some guiding significance to the application of the bioremediation technology in surface environments.
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Affiliation(s)
- Lei Ding
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Wen-Fa Tan
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China; Key Laboratory of Pollution Control and Resource Technology of Hunan Province, Hunan University, Hengyang 421001, China.
| | - Shui-Bo Xie
- Key Laboratory of Pollution Control and Resource Technology of Hunan Province, Hunan University, Hengyang 421001, China; Key Laboratory of Uranium Metallurgy and Biotechnology, University of South China, Hengyang 421001, China
| | - Kathryn Mumford
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Australia
| | - Jun-Wen Lv
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Hong-Qiang Wang
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Qi Fang
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiao-Wen Zhang
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiao-Yan Wu
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Mi Li
- Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
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Mori T, Ikeda Y, Takao K. Extraction Behavior of U(VI) Using Novel Betainium-Type Ionic Liquids: More Hydrophobic Cations Enhance Extractability, Selectivity, and Recyclability. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20160210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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