Effects of Microbial Fe(III) Reduction on the Sorption of Cs and Sr on Biotite and Chlorite
Effects of Microbial Fe(III) Reduction on the Sorption of Cs and Sr on Biotite and Chlorite
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DOI：
10.1080/01490451.2015.1076543
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发表时间：
2016-02
影响因子：
2.3
通讯作者：
D. Brookshaw;J. Lloyd;D. Vaughan;R. Pattrick
中科院分区：
文献类型：
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作者：
D. Brookshaw;J. Lloyd;D. Vaughan;R. Pattrick
摘要 与非生物系统相比，Shewanella oneidensis MR-1 通过微生物介导还原亚氯酸盐和黑云母中的 Fe(III)，导致 Cs 和 Sr 的吸附显着减少。正如之前的研究所示，黑云母是比亚氯酸盐更有效的吸附剂。与矿物相关的 Fe(III) 的减少会导致两种矿物的溶解增加，并减少可用于 Cs 和 Sr 吸附的位点。随着这种溶解的进行，它会导致 Cs 和 Sr 从亚氯酸盐中解吸，但不会从黑云母中解吸。随后暴露在空气中会增加吸附，因为生物还原释放的 Fe(II) 会产生次生 Fe(III) 羟基氧化物矿物的沉淀。与氧化还原活性元素的成功生物修复相反，这项研究表明微生物 Fe(III) 还原可以增强 Cs 和 Sr 通过页硅酸盐为主的地层的迁移。
ABSTRACT Microbially mediated reduction of Fe(III) in chlorite and biotite by Shewanella oneidensis MR-1 leads to a significant reduction in sorption of both Cs and Sr compared to the abiotic systems. As seen in previous studies, biotite is a more efficient sorbent than chlorite. Reduction of the mineral-associated Fe(III) causes increased dissolution of both minerals and reduces the sites available for Cs and Sr sorption. As this dissolution progresses it causes desorption of Cs and Sr from chlorite, but not biotite. Subsequent exposure to air increases sorption due to precipitation of secondary Fe(III) oxyhydroxide minerals derived from the Fe(II) released by bio-reduction. In contrast to successful bioremediation of redox active elements, this study suggests that microbial Fe(III) reduction could enhance the migration of Cs and Sr through phyllosilicate-dominated strata.