Microbial Reduction of Antimony(V)-Bearing Ferrihydrite by Geobacter sulfurreducens.
Microbial Reduction of Antimony(V)-Bearing Ferrihydrite by Geobacter sulfurreducens.
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硫还原地杆菌对含锑 (V) 的水铁矿的微生物还原。
DOI：
10.1128/aem.02175-22
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发表时间：
2023
影响因子：
4.4
通讯作者：
Xie J
中科院分区：
文献类型：
--
作者：
Xie J
本文研究了含Sb（V）的水铁矿被Geodynessulfreducens还原的过程，以确定在富铁体系中发生氧化还原转变时准金属的命运。Sb（V）在一定浓度范围内容易吸附到水铁矿上，并且负载量对Fe（III）还原的速率和程度以及形成的产物有显著影响。磁铁矿占主导地位，在低（0.5和1摩尔%）锑（V）浓度，与晶粒尺寸降低，在较高的锑负载：37-，25-和17-nm的颗粒无锑，0.5%锑，和1%锑样品，分别。与此相反，针铁矿是主要的最终产品的样品具有较高的锑负载量（2和5摩尔%），与增加针铁矿粒度在5%的Sb样品。电感耦合质谱（ICP-MS）分析证实，在生物还原过程中，Sb没有释放到溶液中，X射线光电子能谱（XPS）分析表明，在整个实验过程中没有形成Sb（III），证实了Fe（III）还原细菌Geophylsulfurreducens不能通过酶促或生物Fe（II）还原Sb（V）。这些研究结果表明，铁（生物）矿物在限制锑污染的环境中有潜在的作用，即使在进行氧化还原transformation.IMPORTANCEAntimony是一种新兴的污染物，与砷的化学特性。金属还原细菌（例如硫还原地杆菌）可以在厌氧条件下导致Fe（III）矿物中的砷迁移，从而导致全球含水层的广泛污染。这项研究探讨了金属还原菌是否可以在类似条件下驱动锑的移动。在这项研究中，我们表明，G。硫还原剂不能直接还原Sb（V）或在Fe（III）矿物水铁矿的生物还原过程中引起Sb释放[尽管吸附的Sb（V）确实改变了形成的Fe（II）矿物最终产物]。总的来说，这项研究突出了铁和锑在环境系统之间的紧密联系，这表明微生物还原的Fe（III）/Sb矿物组合可能不会导致锑释放（形成鲜明对比的动员作为在富铁系统），并提供了潜在的铁为基础的修复选项Sb污染的环境。
The reduction of Sb(V)-bearing ferrihydrite by Geobacter sulfurreducens was studied to determine the fate of the metalloid in Fe-rich systems undergoing redox transformations. Sb(V) added at a range of concentrations adsorbed readily to ferrihydrite, and the loadings had a pronounced impact on the rate and extent of Fe(III) reduction and the products formed. Magnetite dominated at low (0.5 and 1 mol%) Sb(V) concentrations, with crystallite sizes decreasing at higher Sb loadings: 37-, 25-, and 17-nm particles for no-Sb, 0.5% Sb, and 1% Sb samples, respectively. In contrast, goethite was the dominant end product for samples with higher antimony loadings (2 and 5 mol%), with increased goethite grain size in the 5% Sb sample. Inductively coupled mass spectrometry (ICP-MS) analysis confirmed that Sb was not released to solution during the bioreduction process, and X-ray photoelectron spectroscopy (XPS) analyses showed that no Sb(III) was formed throughout the experiments, confirming that the Fe(III)-reducing bacterium Geobacter sulfurreducens cannot reduce Sb(V) enzymatically or via biogenic Fe(II). These findings suggest that Fe (bio)minerals have a potential role in limiting antimony pollution in the environment, even when undergoing redox transformations.IMPORTANCEAntimony is an emerging contaminant that shares chemical characteristics with arsenic. Metal-reducing bacteria (such as Geobacter sulfurreducens) can cause the mobilization of arsenic from Fe(III) minerals under anaerobic conditions, causing widespread contamination of aquifers worldwide. This research explores whether metal-reducing bacteria can drive the mobilization of antimony under similar conditions. In this study, we show that G. sulfurreducens cannot reduce Sb(V) directly or cause Sb release during the bioreduction of the Fe(III) mineral ferrihydrite [although the sorbed Sb(V) did alter the Fe(II) mineral end products formed]. Overall, this study highlights the tight associations between Fe and Sb in environmental systems, suggesting that the microbial reduction of Fe(III)/Sb mineral assemblages may not lead to Sb release (in stark contrast to the mobilization of As in iron-rich systems) and offers potential Fe-based remediation options for Sb-contaminated environments.