微生物溶解载铀赤铁矿及再固定铀的试验研究

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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 CO₃^2- had a significant facilitation effect on the reductive dissolution of U(VI)-laden hematite by S. sanxanigenens mediated by riboflavin; 2mmol/L PO₄^3- 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.

Key words： riboflavin S. sanxanigenens U(VI)-laden hematite uranium

Received: 22 May 2020

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X52

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	Articles by authors
	YOU Qing
	YU Zhao-hui
	DAI Zhong-ran
	ZHANG Hui
	WANG Yong-dong
	DING De-xin

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YOU Qing,YU Zhao-hui,DAI Zhong-ran等. Dissolution of the U(VI)-laden hematite and reimmobilization of uranium by microorganism mediated by riboflavin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 214-222.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/214

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