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首页> 外文期刊>Environmental Science & Technology >Enhancement of H_2O_2 Decomposition by the Co-catalytic Effect of WS_2 on the Fenton Reaction for the Synchronous Reduction of Cr(Ⅵ) and Remediation of Phenol
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Enhancement of H_2O_2 Decomposition by the Co-catalytic Effect of WS_2 on the Fenton Reaction for the Synchronous Reduction of Cr(Ⅵ) and Remediation of Phenol

机译：WS_2协同催化Fenton反应同时还原Cr（Ⅵ）和修复苯酚的反应增强H_2O_2分解

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摘要

The greatest problem in the Fe(II)/H2O2 Fenton reaction is the low production of center dot OH owing to the inefficient Fe(III)/Fe(II) cycle and the low decomposition efficiency of H2O2 (30%). Herein, we report a new discovery regarding the significant co-catalytic effect of WS2 on the decomposition of H2O2 in a photoassisted Fe(II)/H2O2 Fenton system. With the help of WS2 co-catalytic effect, the H2O2 decomposition efficiency can be increased from 22.9% to 60.1%, such that minimal concentrations of H2O2 (0.4 mmol/L) and Fe2+ (0.14 mmol/L) are necessary for the standard Fenton reaction. Interestingly, the co-catalytic Fenton strategy can be applied to the simultaneous oxidation of phenol (10 mg/L) and reduction of Cr(VI) (40 mg/L), and the corresponding degradation and reduction rates can reach up to 80.9% and 90.9%, respectively, which are much higher than the conventional Fenton reaction (52.0% and 31.0%). We found that the expose reductive W4+ active sites on the surface of WS2 can greatly accelerate the rate-limiting step of Fe3+/Fe2+ conversion, which plays the key role in the decomposition of H2O2 and the reduction of Cr(VI). Our discovery represents a breakthrough in the field of inorganic catalyzing AOPs and greatly advances the practical utility of this method for environmental applications.
机译：Fe（II）/ H2O2 Fenton反应中的最大问题是由于Fe（III）/ Fe（II）循环效率低和H2O2分解效率低（<30％）导致中心点OH的产量低。在本文中，我们报告了有关光辅助Fe（II）/ H2O2 Fenton系统中WS2对H2O2分解的显着共催化作用的新发现。借助WS2的协同催化作用，H2O2的分解效率可以从22.9％提高到60.1％，因此标准Fenton所需的H2O2（0.4 mmol / L）和Fe2 +（0.14 mmol / L）最低浓度反应。有趣的是，共催化Fenton策略可以应用于苯酚（10 mg / L）的同时氧化和Cr（VI）（40 mg / L）的还原，相应的降解和还原率可以达到80.9％分别为90.9％和90.9％，远高于常规的Fenton反应（52.0％和31.0％）。我们发现，WS2表面暴露的还原性W4 +活性位点可以极大地加速Fe3 + / Fe2 +转化的限速步骤，这在H2O2的分解和Cr（VI）的还原中起关键作用。我们的发现代表了无机催化AOPs领域的突破，并大大提高了该方法在环境应用中的实用性。

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  • 来源
    《Environmental Science & Technology》 |2018年第19期|11297-11308|共12页
  • 作者

    Dong Chencheng; Ji Jiahui; Shen Bin; Xing Mingyang; Zhang Jinlong;

  • 作者单位

    East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;

    East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples 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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