Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp strain BoFeN1
Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp strain BoFeN1
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DOI：
10.1016/j.gca.2011.02.044
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发表时间：
2011-09-01
影响因子：
5
通讯作者：
Kappler, Andreas
中科院分区：
文献类型：
--
作者：
Hohmann, Claudia;Morin, Guillaume;Kappler, Andreas
砷(As)等污染物在天然Fe(III)(含氧)氧化物上的吸附是非常常见的，已被证明发生在非生物和生物Fe(II)氧化过程中。人工合成的Fe(III)(羟基)氧化物矿物对As的吸附和共沉淀的分子机理已被广泛研究，但对生物成因矿物的研究较少。在本研究中，我们利用Fe和As的K边X射线吸收近边结构(XANES)、扩展X射线吸收精细结构(EXAFS)光谱、穆斯堡尔谱、X射线衍射谱和透射电子显微镜研究了As(V)和As(III)与硝酸盐还原Fe(II)氧化细菌Acidovorax sp.形成的生物Fe(III)(O2)氧化物矿物的相互作用。BoFeN1菌株。结果表明，菌株BoFeN1具有固定As的能力，以及As(III)和As(V)对生物生成Fe(III)(Oxhyr)氧化物的影响。在无As和低As负荷(As：Fe)的情况下
Sorption of contaminants such as arsenic (As) to natural Fe(III) (oxyhydr)oxides is very common and has been demonstrated to occur during abiotic and biotic Fe(II) oxidation. The molecular mechanism of adsorption-and co-precipitation of As has been studied extensively for synthetic Fe(III) (oxyhydr) oxide minerals but is less documented for biogenic ones. In the present study, we used Fe and As K-edge X-ray Absorption Near Edge Structure (XANES), extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, Mossbauer spectroscopy, XRD, and TEM in order to investigate the interactions of As(V) and As(III) with biogenic Fe(III) (oxyhydr) oxide minerals formed by the nitrate-reducing Fe(II)-oxidizing bacterium Acidovorax sp. strain BoFeN1. The present results show the As immobilization potential of strain BoFeN1 as well as the influence of As(III) and As(V) on biogenic Fe(III) (oxyhydr) oxide formation. In the absence of As, and at low As loading (As:Fe