Highly efficient degradation of organic pollutants using a microbially-synthesized nanocatalyst
Highly efficient degradation of organic pollutants using a microbially-synthesized nanocatalyst
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DOI：
10.1016/j.ibiod.2016.12.008
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发表时间：
2017-04
影响因子：
4.8
通讯作者：
M. Watts;R. S. Cutting;N. Joshi;V. Coker;Apalona Mosberger;Bo Zhou;Catherine R. Davies;B. Dongen;Thomas Hoffstetter;J. Lloyd
中科院分区：
文献类型：
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作者：
M. Watts;R. S. Cutting;N. Joshi;V. Coker;Apalona Mosberger;Bo Zhou;Catherine R. Davies;B. Dongen;Thomas Hoffstetter;J. Lloyd
磁铁矿是一种常见的地下矿物，在厌氧环境中生物形成。它含有 Fe(II)，对各种常见的氧化还原敏感的地下污染物具有反应性。为了扩展生物磁铁矿的反应活性，可以添加 Pd(0) 纳米结构涂层，该涂层能够持续催化反应活性。在这里，我们评估了生物纳米磁铁矿（BnM）（由硫还原地杆菌还原羟基氧化铁形成）与模型有机化合物硝基苯（ArNO2）和四氯乙烯（PCE）的反应性，并将其性能与Pd（0）功能化的生物磁铁矿（Pd-BnM）进行了比较。 BnM 和 Pd-BnM 均被发现对 ArNO2 具有高度反应性，将其定量转化为还原产物苯胺 (ArNH2)。当应用于四氯乙烯 (PCE) 时，发现 BnM 的反应性很差，而 Pd-BnM 可以将 PCE 快速脱氯为良性产物乙烷，其速率与合成纳米级催化剂相当。所提出的生物合成路线具有高度可扩展性，并为生产用于环境净化的高反应性纳米粒子提供了一条绿色、环境友好的路线。
Magnetite is a common subsurface mineral, formed biogenically in anaerobic environments. Containing Fe(II), it is reactive towards a variety of common redox sensitive subsurface contaminants. To extend the reactivity of biomagnetite it is possible to add a coating of Pd(0) nanostructures, which is capable of sustained catalytic reactivity. Here we assess the reactivity of biogenic nano-magnetite (BnM), formed by the reduction of Fe(III) oxyhydroxide byGeobacter sulfurreducens, to the model organic compounds nitrobenzene (ArNO2) and tetrachloroethylene (PCE), and compare its performance to biomagnetite functionalized with Pd(0) (Pd-BnM). The BnM and the Pd-BnM were both found to be highly reactive towards ArNO2, quantitatively transforming it to the reduced product aniline (ArNH2). When applied to tetrachloroethylene (PCE), the BnM was found to be poorly reactive, while the Pd-BnM rapidly dechlorinated the PCE to the benign product, ethane, at rates comparable to synthetic nano-scale catalysts. The biological synthesis route proposed is highly scalable and offers a green, environmentally benign route for the production of highly reactive nanoparticles for environmental clean-up.