蒽醌-2-磺酸钠介导下奥奈达希瓦氏菌还原U（VI）

在厌氧环境下,以蒽醌-2-磺酸钠（AQS）作为腐殖质模式物,对奥奈达希瓦氏菌（Shewanella oneidensis,S.oneidensis）还原U（VI）的效果与主要影响因素进行研究。结果表明：在30°C,当p H值为7.0,AQS为1.0 mmol/L,反应96 h后,S.oneidensis对U（VI）的去除率达到99.0%。AQS浓度为0.5-1.0 mmol/L时,其能有效促进U（VI）的还原,当AQS浓度超过2.0 mmol/L时,其对U（VI）的还原促进作用明显减小。Cu2＋、Cr6＋和Mn2＋对U（VI）的还原均表现出明显的抑制作用,而Zn2＋对U（VI）的还原影响较小。...

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Published in中国有色金属学报：英文版 Vol. 25; no. 12; pp. 4144 - 4150
Main Author 刘金香 谢水波 王永华 刘迎九 蔡萍莉 熊芬 王文涛
Format Journal Article
LanguageEnglish
Published 2015
Subjects
U（VI）
XPS
奥奈达希瓦氏菌
蒽醌-2-磺酸钠（AQS）
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Summary:在厌氧环境下,以蒽醌-2-磺酸钠（AQS）作为腐殖质模式物,对奥奈达希瓦氏菌（Shewanella oneidensis,S.oneidensis）还原U（VI）的效果与主要影响因素进行研究。结果表明：在30°C,当p H值为7.0,AQS为1.0 mmol/L,反应96 h后,S.oneidensis对U（VI）的去除率达到99.0%。AQS浓度为0.5-1.0 mmol/L时,其能有效促进U（VI）的还原,当AQS浓度超过2.0 mmol/L时,其对U（VI）的还原促进作用明显减小。Cu2＋、Cr6＋和Mn2＋对U（VI）的还原均表现出明显的抑制作用,而Zn2＋对U（VI）的还原影响较小。NO3-离子浓度低于0.5 mmol/L时,其对U（VI）的还原基本没有影响,而当NO3-离子浓度高于1.0 mmol/L时,其对U（VI）的还原存在明显的抑制作用。当SO42-离子浓度低于5.0 mmol/L时,其对U（VI）的还原有微弱的促进作用。在AQS＋S.oneidensis＋U（VI）还原体系中投加零价铁（ZVI）,能快速促进U（VI）的还原,且U（VI）的还原率与ZVI的投加量（0-2.0 mg/L）呈正相关。XPS分析结果表明：菌体表面沉积U（VI）和U（IV）两种价态的U元素,反应后的铀主要形成稳定的UO2。
Bibliography:43-1239/TG
Anthraquinone-2-sulfonate（AQS） was employed in humus substitutes to evaluate the effects and influencing factors of U（VI） reduction by Shewanella oneidensis MR-1（S. oneidensis MR-1） under anaerobic condition. The removal rate of U（VI） at 30 °C reaches 99.0% afterd 96 h with the p H value of 7.0 and AQS concentration of 1.0 mmol/L. The effective concentrations of AQS as the accelerator for U（VI） bioreduction are approximately 0.5-1.0 mmol/L. The bioreduction of U（VI） is inhibited when the concentration of AQS exceeds 2.0 mmol/L. The coexistence of ions, such as Cu2＋, Cr6＋, Mn2＋, shows a remarkable negative effect on the U（VI） reduction, and Zn2＋ shows less influence on the process compared with other tested ions. The U（VI） reduction is remarkably inhibited when the concentration of nitrate ion exceeds 1.0 mmol/L. Otherwise, no difference is found when the nitrate ion concentration is less than 0.5 mmol/L. Sulfate ion（5.0 mmol/L） slightly promotes the U（VI） reduction. Zero-valent iron（ZVI） promotes the U（VI） reduction by S. oneidensis, and the reduction rate improves with increasing the amount of ZVI in the range of 0-2.0 g/L. The XPS result indicates that uranium deposits on the cell surface are in U（VI） and U（IV） forms, and the majority of uranium in the solution is stable UO2.
U（VI）; anthraquinone-2-sulfonate（AQS）; Shewanella oneidensis; XPS
Jin-xiang LIU,Shui-bo XIE,Yong-hua WANG,Ying-jiu LIU,Ping-li CAI,Fen XIONG,Wen-tao WANG （1. Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang 421001, China, 2. Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China）
ISSN:1003-6326