Reduction of antimony mobility from Sb-rich smelting slag by Shewanella oneidensis: Integrated biosorption and precipitation
Reduction of antimony mobility from Sb-rich smelting slag by Shewanella oneidensis: Integrated biosorption and precipitation
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DOI：
10.1016/j.jhazmat.2021.127385
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发表时间：
2021-12-18
影响因子：
13.6
通讯作者：
Dong, Zichao
中科院分区：
文献类型：
--
作者：
Jia, Xiaocen;Ma, Liyuan;Dong, Zichao
异化铁还原菌在还原环境中对锑的迁移起着重要作用。富锑冶炼渣是含铁（Fe）的锑矿山废弃物，是锑污染的主要来源之一。在本研究中，可溶性锑与Fe（III）通过S。oneidensis（Shewanella oneidensis菌株MR-1）在还原条件下进行了S.研究了oneidensis。结果表明，释放的Sb被S. oneidensis，菌株对Sb（III）的吸附优先。Sb（V）可被S还原。无Fe水溶液的oneidensis。在Fe（III）存在下，S. oneidensis介导的Sb生物吸附和Sb-Fe的化学氧化还原同时发生。Sb与Fe共沉淀形成Sb（V）-O-Fe（III）次生矿物，扩展X射线吸收精细结构（EXAFS）分析确定其为双齿单核共边结构。这些结果提示S. oneidensis对缺氧土壤和地下水中锑的固定化和毒性降低具有积极作用，为锑污染的治理提供了理论依据。
The dissimilatory Fe(III)-reducing bacteria play a significant role in the mobility of antimony (Sb) under reducing environment. Sb-rich smelting slag is iron (Fe)-containing antimonic mine waste, which is one of the main sources of antimony pollution. In this study, the soluble antimony reacted with Fe(III) by S. oneidensis (Shewanella oneidensis strain MR-1) was performed in reduction condition, then the dissolution behavior of the Sb-rich smelting slag with S. oneidensis was investigated. The results showed that the released Sb was immobilized by S. oneidensis and the strain adsorbed Sb(III) preferentially. Sb(V) can be reduced by S. oneidensis without aqueous Fe. In the presence of Fe(III), S. oneidensis mediated Sb bio-adsorption and the chemical redox of Sb-Fe occurred simultaneously. Sb was co-precipitated with Fe to form the Sb(V)-O-Fe(III) secondary mineral, which was identified as the bidentate mononuclear edge-sharing structure by extended X-ray absorption fine structure (EXAFS) analysis. These results suggest that S. oneidensis has a positive effect on the immobilization and minimizing toxicity of antimony in anoxic soil and groundwater, which provides a theoretical basis for the treatment of antimony contamination.