首页> 外文期刊>Environmental Science & Technology >Oxygen Vacancy Promoted Heterogeneous Fenton-like Degradation of Ofloxacin at pH 3.2-9.0 by Cu Substituted Magnetic Fe_3O_4@FeOOH Nanocomposite
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Oxygen Vacancy Promoted Heterogeneous Fenton-like Degradation of Ofloxacin at pH 3.2-9.0 by Cu Substituted Magnetic Fe_3O_4@FeOOH Nanocomposite

机译:Cu取代磁性Fe_3O_4 @ FeOOH纳米复合材料在氧空位下促进氧氟沙星在pH 3.2-9.0下的异质Fenton样降解

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摘要

To develop an ultraefficient and reusable heterogeneous Fenton-like catalyst at a wide working pH range is a great challenge for its application in practical water treatment. We report an oxygen vacancy promoted heterogeneous Fenton-like reaction mechanism and an unprecedented ofloxacin (OFX) degradation efficiency of Cu doped Fe_3O_4@FeOOH magnetic nanocomposite. Without the aid of external energy, OFX was always completely removed within 30 min at pH 3.2—9.0. Compared with Fe_3O_4@FeOOH, the pseudo-first-order reaction constant was enhanced by 10 times due to Cu substitution (9.04/h vs 0.94/h). Based on the X-ray photoelectron spectroscopy (XPS), Raman analysis, and the investigation of H_2O_2 decomposition, *OH generation, pH effect on OFX removal and H_2O_2 utilization efficiency, the new formed oxygen vacancy from in situ Fe substitution by Cu rather than promoted Fe~(3+)/Fe~(2+) cycle was responsible for the ultraefficiency of Cu doped Fe_3O_4@FeOOH at neutral and even alkaline pHs. Moreover, the catalyst had an excellent long-term stability and could be easily recovered by magnetic separation, which would not cause secondary pollution to treated water.
机译:在宽的工作pH范围内开发出一种超高效且可重复使用的非均相类Fenton催化剂,对于其在实际水处理中的应用是一个巨大的挑战。我们报告氧空位促进异质类Fenton反应机制和铜掺杂Fe_3O_4 @ FeOOH磁性纳米复合材料前所未有的氧氟沙星(OFX)降解效率。在没有外部能量帮助的情况下,总是在30分钟内在pH 3.2-9.0下完全去除了OFX。与Fe_3O_4 @ FeOOH相比,由于铜取代,伪一级反应常数提高了10倍(9.04 / h对0.94 / h)。基于X射线光电子能谱(XPS),拉曼分析以及对H_2O_2分解,* OH生成,pH对OFX去除的影响以及H_2O_2利用率的研究,新形成的氧空位是由原位Fe取代Cu而不是Cu促进的Fe〜(3 +)/ Fe〜(2+)循环是Cu掺杂的Fe_3O_4 @ FeOOH在中性甚至碱性pH值下的超高效率的原因。此外,该催化剂具有优异的长期稳定性,并且可以通过磁分离容易地回收,这不会对处理后的水造成二次污染。

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  • 来源
    《Environmental Science & Technology》 |2017年第21期|12699-12706|共8页
  • 作者单位

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

    Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China;

  • 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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  • 正文语种 eng
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  • 入库时间 2022-08-17 13:57:55

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