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首页> 外文期刊>Environmental Science & Technology >Copper Nanoparticle Induced Cytotoxicity to Nitrifying Bacteria in Wastewater Treatment: A Mechanistic Copper Speciation Study by X-ray Absorption Spectroscopy
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Copper Nanoparticle Induced Cytotoxicity to Nitrifying Bacteria in Wastewater Treatment: A Mechanistic Copper Speciation Study by X-ray Absorption Spectroscopy

机译：铜纳米粒子诱导废水中硝化细菌的细胞毒性：X射线吸收光谱的机械铜形态研究。

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摘要

With the inclusion of engineered nanomaterials in industrial processes and consumer products, wastewater treatment plants (WWTPs) could serve as a major sink for these emerging contaminants. Previous research has demonstrated that nanomaterials are potentially toxic to microbial communities utilized in biological wastewater treatment (BWT). Copper-based nanoparticles (CuNPs) are of particular interest based on their increasing use in wood treatment, paints, household products, coatings, and byproducts of semiconductor manufacturing. A critical step in BWT is nutrient removal through nitrification. This study examined the potential toxicity of uncoated and polyvinylpyrrolidone (PVP)-coated CuO, and Cu_2O nanoparticles, as well as Cu ions to microbial communities responsible for nitrification in BWT. Inhibition was inferred from changes to the specific oxygen uptake rate (sOUR) in the absence and presence of Cu ions and CuNPs. X-ray absorption fine structure spectroscopy, with linear combination fitting (LCF), was utilized to track changes to Cu speciation throughout exposure. Results indicate that the dissolution of Cu ions from CuNPs drive microbial inhibition. The presence of a PVP coating on CuNPs has little effect on inhibition. LCF analysis of the biomass combined with metal partitioning analysis supports the current hypothesis that Cu-induced cytotoxicity is primarily caused by reactive oxygen species formed from ionic Cu in solution via catalytic reaction intermediated by reduced Cu(I) species.
机译：通过在工业过程和消费产品中包含工程纳米材料，废水处理厂（WWTP）可以充当这些新兴污染物的主要吸收者。先前的研究表明，纳米材料对生物废水处理（BWT）中使用的微生物群落具有潜在的毒性。基于铜的纳米粒子（CuNPs）在木材处理，油漆，家用产品，涂料和半导体制造的副产品中的越来越多的使用引起了人们的特别关注。 BWT的关键步骤是通过硝化作用去除营养。这项研究检查了未涂覆和聚乙烯吡咯烷酮（PVP）涂覆的CuO和Cu_2O纳米颗粒以及Cu离子对负责BWT中硝化作用的微生物群落的潜在毒性。在不存在和存在Cu离子和CuNPs的情况下，通过比氧吸收率（sOUR）的变化推断抑制作用。具有线性组合拟合（LCF）的X射线吸收精细结构光谱用于跟踪整个曝光过程中Cu形态的变化。结果表明，CuNPs中Cu离子的溶解驱动了微生物抑制作用。 CuNPs上PVP涂层的存在对抑制作用很小。对生物量的LCF分析与金属分配分析相结合，支持了当前的假设，即铜诱导的细胞毒性主要是由溶液中离子铜通过催化反应（还原的Cu（I）物种）形成的活性氧物种引起的。

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  • 来源
    《Environmental Science & Technology》 |2016年第17期|9105-9113|共9页
  • 作者

    Justin G. Clar; Xuan Li; Christopher A. Impellitteri; Christina Bennett-Stamper; Todd P. Luxton;

  • 作者单位

    Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, Tennessee 37831, United States,National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, Ohio 45224, United States;

    Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, Tennessee 37831, United States,National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, Ohio 45224, United States;

    National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, Ohio 45224, United States;

    National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, Ohio 45224, United States;

    National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, Ohio 45224, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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