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首页> 外文期刊>Environmental Science & Technology >Oxidative Degradation of Nalidixic Acid by Nano-magnetite via Fe~(2+)/ O_2-Mediated Reactions
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Oxidative Degradation of Nalidixic Acid by Nano-magnetite via Fe~(2+)/ O_2-Mediated Reactions

机译：Fe〜（2 +）/ O_2介导的纳米磁铁矿氧化降解萘啶酸

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摘要

Organic pollution has become a critical issue worldwide due to the increasing input and persistence of organic compounds in the environment. Iron minerals are potentially able to degrade efficiently organic pollutants sorbed to their surfaces via oxidative or reductive transformation processes. Here, we explored the oxidative capacity of nano-magnetite (Fe_3O_4) having ～12 nm particle size, to promote heterogeneous Fenton-like reactions for the removal of nalidixic acid (NAL), a recalcitrant quinolone antibacterial agent. Results show that NAL was adsorbed at the surface of magnetite and was efficiently degraded under oxic conditions. Nearly 60% of this organic contaminant was eliminated after 30 min exposure to air bubbling in solution in the presence of an excess of nano-magnetite. X-ray diffraction (XRD) and Fe K-edge X-ray absorption spectroscopy (XANES and EXAFS) showed a partial oxidation of magnetite to maghemite during the reaction, and four byproducts of NAL were identified by liquid chromatography-mass spectroscopy (UHPLC-MS/MS). We also provide evidence that hydroxyl radicals (HO·) were involved in the oxidative degradation of NAL, as indicated by the quenching of the degradation reaction in the presence of ethanol. This study points out the promising potentialities of mixed valence iron oxides for the treatment of soils and wastewater contaminated by organic pollutants.
机译：由于有机化合物在环境中的投入不断增加和持续存在，有机污染已成为世界范围内的关键问题。铁矿物质有可能通过氧化或还原转化过程有效降解吸附到其表面的有机污染物。在这里，我们探索了具有〜12 nm粒径的纳米磁铁矿（Fe_3O_4）的氧化能力，以促进异质Fenton样反应来去除顽固性喹诺酮类抗菌药物萘啶酸（NAL）。结果表明，NAL被吸附在磁铁矿表面，并在有氧条件下被有效降解。在过量纳米磁铁矿存在下于溶液中暴露于空气中气泡30分钟后，将近60％的有机污染物被清除。 X射线衍射（XRD）和Fe K边缘X射线吸收光谱（XANES和EXAFS）在反应过程中显示出磁铁矿部分氧化为磁赤铁矿，并且通过液相色谱-质谱（UHPLC- MS / MS）。我们还提供了证据，表明羟基自由基（HO·）参与了NAL的氧化降解，如乙醇存在下降解反应的淬灭所表明。这项研究指出了混合价铁氧化物在处理土壤和有机污染物污染的废水方面的潜力。

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  • 来源
    《Environmental Science & Technology》 |2015年第7期|4506-4514|共9页
  • 作者

    Sandy G. Ardo; Sylvie Nelieu; Georges Ona-Nguema; Ghislaine Delarue; Jessica Brest; Elsa Pironin; Guillaume Morin;

  • 作者单位

    Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR 7590, CNRS - UPMC - IRD - MNHN, 4 Place Jussieu, F-75252 Paris Cedex 05, France;

    INRA, UR251 PESSAC, Route de Saint-Cyr, F-78026 Versailles Cedex, France;

    Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR 7590, CNRS - UPMC - IRD - MNHN, 4 Place Jussieu, F-75252 Paris Cedex 05, France;

    INRA, UR251 PESSAC, Route de Saint-Cyr, F-78026 Versailles Cedex, France;

    Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR 7590, CNRS - UPMC - IRD - MNHN, 4 Place Jussieu, F-75252 Paris Cedex 05, France;

    Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR 7590, CNRS - UPMC - IRD - MNHN, 4 Place Jussieu, F-75252 Paris Cedex 05, France;

    Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR 7590, CNRS - UPMC - IRD - MNHN, 4 Place Jussieu, F-75252 Paris Cedex 05, France;

  • 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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