Inhibition of biological TCE and sulphate reduction in the presence of iron nanoparticles
Inhibition of biological TCE and sulphate reduction in the presence of iron nanoparticles
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DOI：
10.1016/j.chemosphere.2010.04.033
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发表时间：
2010-07-01
期刊：
影响因子：
8.8
通讯作者：
Thompson, Ian P.
中科院分区：
文献类型：
--
作者：
Barnes, Robert J.;Riba, Olga;Thompson, Ian P.
铁（Fe）纳米颗粒越来越多地被用于氯代脂肪族烃（CAH）污染场地的修复。然而，最近有报道称这些颗粒对细菌细胞具有细胞毒性，因此可能对暴露的微生物群落产生负面影响。本研究的总体目标是调查铁纳米颗粒对CAHs的生物降解的土著脱氯细菌群落的影响。此外，以确定最合适的组合和/或应用的镍/铁纳米粒子和脱氯细菌的修复CAH污染的网站。从英国德比的CAH污染场地收集的地下水中添加Fe纳米颗粒，导致氧化还原电位（ORP）降低和pH升高。观察到TCE的生物降解速率随着Fe纳米颗粒浓度的增加而逐渐降低;其范围为0.01 - 0.1 g L-1，并在0.3 g L-1或更高浓度时完全停止。浓度大于0.3克L-1导致活菌计数下降和生物硫酸盐还原的抑制。最合适的手段相结合的Ni-Ni/Fe纳米粒子和土著脱氯细菌是采用一个两步的过程：首先刺激的生物降解TCE使用乙酸，然后添加Ni-Ni纳米粒子降解剩余的顺式-1，2-DCE和VC。皇冠版权所有（C）2010由爱思唯尔有限公司出版。保留所有权利。
Iron (Fe) nanoparticles are increasingly being employed for the remediation of Chlorinated Aliphatic Hydrocarbon (CAH) contaminated sites. However, these particles have recently been reported to be cytotoxic to bacterial cells, and may therefore have a negative impact on exposed microbial communities. The overall objective of this study was to investigate the impact of Fe nanoparticles on the biodegradation of CAHs by an indigenous dechlorinating bacterial community. Also, to determine the most appropriate combination and/or application of bimetallic (Ni/Fe) nanoparticles and dechlorinating bacteria for the remediation of CAH contaminated sites. Addition of Fe nanoparticles to groundwater collected from a CAH contaminated site in Derby, UK, led to a decrease in the oxidation-reduction potential (ORP) and an increase in pH. The biological degradation rate of TCE was observed to progressively decrease in the presence of increasing Fe nanoparticle concentrations; which ranged from 0.01 to 0.1 g L-1, and cease completely at concentrations of 0.3 g L-1 or above. Concentrations greater than 0.3 g L-1 led to a decline in viable bacterial counts and the inhibition of biological sulphate reduction. The most appropriate means of combining bimetallic (Ni/Fe) nanoparticles and indigenous dechlorinating bacteria was to employ a two step process: initially stimulating the biodegradation of TCE using acetate, followed by the addition of bimetallic nanoparticles to degrade the remaining cis-1,2-DCE and VC. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.