Dissolution of the U(VI)-laden hematite and reimmobilization of uranium by microorganism mediated by riboflavin
YOU Qing1,2, YU Zhao-hui1,2, DAI Zhong-ran1,2, ZHANG Hui1,2, WANG Yong-dong1,2, DING De-xin1,2
1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China; 2. Hunan Province Key Laboratory of Green Development Technology for Exetremely Low Grade Uranium Resources, Hengyang 421001, China
Abstract：U(VI)-laden hematite, riboflavin (RF) and Sphingomonas sanxanigenens (S. sanxanigenens) were simultaneously added to the medium, variations of total Fe, Fe(II) and U(VI) concentrations were monitored during the process of culture, the chemical forms of iron and uranium in solid phase products were analyzed before and after reductive dissolution, and the effect of temperature and coexisted ion on the reductive dissolution of the U(VI)-laden hematite by S. sanxanigenens mediated by riboflavin was analyzed. The results showed that S. sanxanigenens could reductively dissolve U(VI)-laden hematite, leading to release of uranium; the riboflavin could promote the reductive dissolution of U(VI)-loaden hematite by S. sanxanigenens, and the higher concentration of riboflavin is more favorable for this reductive dissolution; the riboflavin could significantly promote the reductive dissolution of U(VI)-loaden hematite and increase the proportion of the stable species of uranium at 30℃; 2mmol/L Ca2+ or CO32- had a significant facilitation effect on the reductive dissolution of U(VI)-laden hematite by S. sanxanigenens mediated by riboflavin; 2mmol/L PO43- increased the proportion of uranium species in residual fractions, promting the fixation of uranium; and riboflavin could promote the reduction of Fe(III) and U(VI) by S. sanxanigenens, and the reaction process was accompanied by the formation of the secondary iron minerals. These results laid the foundation for a new method of riboflavin-mediated S. sanxanigenens release and re-fixation of uranium.
尤青, 於照惠, 戴仲然, 张辉, 王永东, 丁德馨. 微生物溶解载铀赤铁矿及再固定铀的试验研究[J]. 中国环境科学, 2021, 41(1): 214-222.
YOU Qing, YU Zhao-hui, DAI Zhong-ran, ZHANG Hui, WANG Yong-dong, DING De-xin. Dissolution of the U(VI)-laden hematite and reimmobilization of uranium by microorganism mediated by riboflavin. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 214-222.
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