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首页> 外文期刊>Environmental Science & Technology >Abiotic Transformation of Nitrobenzene by Zero Valent Iron under Aerobic Conditions: Relative Contributions of Reduction and Oxidation in the Presence of Ethylene Diamine Tetraacetic Acid
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Abiotic Transformation of Nitrobenzene by Zero Valent Iron under Aerobic Conditions: Relative Contributions of Reduction and Oxidation in the Presence of Ethylene Diamine Tetraacetic Acid

机译：零价铁在有氧条件下零价铁的非生物转化：乙烯二胺四乙酸存在下还原和氧化的相对贡献

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摘要

Zero valent iron (ZVI) applications to remediation of shallow groundwaters can be affected by dissolved oxygen (DO) and organic ligands. To explore the intersection between these complicating factors, this study thoroughly characterized the reactions of nitrobenzene (NB) with ZVI in the presence DO and the model ligand ethylene diamine tetraacetic acid (EDTA). The results showed that NB is degraded by both ZVI reduction and ZVI-induced advanced oxidation under oxygen-limited conditions. The contribution of ·OH to the degradation of NB increased with time so that nearly 39% of NB was oxidized by ·OH at 15 min (pH = 3), but reduction was still the main pathway of NB transformation throughout. NB reduction products, such as aniline (AN), were also oxidized by ·OH. The lower the pH, the greater the contribution of advanced oxidation, but DO was the limiting factor for ·OH generation. Only 4.7% NB was fully degraded by ring opening and/or mineralization because the production of ·OH was limited by low DO. After the transformation of NB and AN, other benzene ring and nitrogen-containing intermediates were identified (e.g., p-nitrophenol, p-aminophenol, hydroquinone, and p-benzoquinone). The removal of total organic carbon and total organic nitrogen was minimal. The results suggested that the relative doses of ZVI, DO, and iron-complexing ligands can be balanced for the optimal (rapid and deep) removal of organic contaminants.
机译：零价铁（ZVI）应用来修复浅层地下水可以受溶解的氧气（DO）和有机配体的影响。为了探讨这些复杂因素之间的交叉路口，本研究彻底地表征存在于存在的情况下与ZVI的硝基苯（NB）和模型配体乙烯二胺四乙酸（EDTA）的反应。结果表明，在氧气有限条件下，ZVI还原和ZVI诱导的晚期氧化均降低Nb。 ·OH对Nb的降解的贡献随时间的增加，使得近39％的Nb在15分钟（pH = 3）时被·OH氧化，但仍然是Nb转化的主要途径。 Nb还原产物，如苯胺（AN），也含··哦氧化。 pH值越低，晚期氧化的贡献越大，但做的是·哦生成的限制因素。只有4.7％的Nb通过环开口和/或矿化完全降解，因为·oh的产生受低的影响。在Nb和An的转化后，鉴定了其他苯环和含氮中间体（例如，对硝基苯酚，对氨基苯酚，氢醌和对苯醌）。除去总有机碳和总有机氮是最小的。结果表明，可以平衡ZVI和铁络合配体的相对剂量，以实现有机污染物的最佳（快速和深）。

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  • 来源
    《Environmental Science & Technology》 |2021年第10期|6828-6837|共10页
  • 作者

    Chuanyu Qin; Jingyi Zhang; Chengwu Zhang; Yu He; Paul G. Tratnyek;

  • 作者单位

    Key Laboratory of Groundwater Resources and Environment Ministry of Education and jilin Provincial Key Laboratory of Water Resources and Environment Jilin University Changchun 130021 China National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology Jilin University Changchun 130021 China;

    Key Laboratory of Groundwater Resources and Environment Ministry of Education and Jilin Provincial Key Laboratory of Water Resources and Environment Jilin University Changchun 130021 China National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology Jilin University Changchun 130021 China;

    Key Laboratory of Groundwater Resources and Environment Ministry of Education and Jilin Provincial Key Laboratory of Water Resources and Environment Jilin University Changchun 130021 China National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology Jilin University Changchun 130021 China;

    Key Laboratory of Groundwater Resources and Environment Ministry of Education and Jilin Provincial Key Laboratory of Water Resources and Environment Jilin University Changchun 130021 China National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology Jilin University Changchun 130021 China;

    OHSU-PSU School of Public Health Oregon Health & Science University Portland Oregon 97239 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);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    zero valent iron; nitrobenzene; EDTA; oxidation; reduction; aerobic; anaerobic; optimization;

    机译：零价铁;硝基苯;EDTA;氧化;减少;有氧;厌氧;优化;

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