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3D hierarchical structures MnO_2/C: A highly efficient catalyst for purification of volatile organic compounds with visible light irradiation

机译：3D分层结构MnO_2 / C：一种高效催化剂，可通过可见光辐射纯化挥发性有机化合物

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摘要

This work mainly focuses on exploring carbon coated epsilon-MnO2 (epsilon-MnO2/C) with 3D hierarchical structures for degradation of gaseous toluene under visible light. Influence of C-coating on surface adsorption, visible-light activity and photocatalytic activities of C-coated MnO2 have been investigated. The results indicate that the C-coating behave as the adsorption and electron-transfer system, and the resulting C-coated epsilon-MnO2 could extend the optical response from UV to visible light region, which can generate more electron - hole pairs. The photocatalyst epsilon-MnO2/0.45C exhibited excellent visible-light photocatalytic activities, with degradation rate of toluene up to 87.34% in 70 min, but no photocatalytic activity could be observed for the pure epsilon-MnO2. The PL spectra and photocurrent response results indicate that the composite structure can not only enhance the utilization of visible light but also consequently reduce electron (e(-))-hole (h(+)) pair recombination, which improve the photocatalytic efficiency of the composite photocatalyst. This work provides a facile and economic approach for fabricating photocatalysts with high efficiency for degradation of VOCs under visible light at room temperature. (C) 2018 Elsevier B.V. All rights reserved.
机译：这项工作主要致力于探索具有3D分层结构的碳包覆的ε-MnO2（ε-MnO2/ C）涂层，用于在可见光下降解气态甲苯。研究了C涂层对C涂层MnO2的表面吸附，可见光活性和光催化活性的影响。结果表明，C涂层具有吸附和电子转移的作用，所得的C涂层的ε-MnO2可将光学响应从UV扩展到可见光区域，从而产生更多的电子-空穴对。光催化剂ε-MnO2/ 0.45C表现出优异的可见光光催化活性，甲苯在70分钟内的降解率高达87.34％，但是对于纯ε-MnO2则没有观察到光催化活性。 PL光谱和光电流响应结果表明，该复合结构不仅可以提高可见光的利用率，而且可以减少电子（e（-））-空穴（h（+））对的复合，从而提高了光催化效率。复合光催化剂。这项工作为在室温下可见光下高效降解VOC的光催化剂提供了一种简便而经济的方法。 （C）2018 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2018年第31期|191-199|共9页
  • 作者

    Zhou Junli; Wu Ming; Zhang Yajun; Zhu Chenguang; Fang Yiwen; Li Yongfeng; Yu Lin;

  • 作者单位

    Guangdong Univ Technol, Fac Chem Engn & Light Ind, Higher Educ Inst, Key Lab Clean Chem Technol Guangdong, Guangzhou 510006, Guangdong, Peoples R China;

    Guangdong Univ Technol, Sch Environm Sci & Engn, Inst Environm Hlth & Pollut Control, Guangzhou Key Lab Environm Catalysis & Pollut Con, Guangzhou 51006, Guangdong, Peoples R China;

    Guangdong Univ Technol, Fac Chem Engn & Light Ind, Higher Educ Inst, Key Lab Clean Chem Technol Guangdong, Guangzhou 510006, Guangdong, Peoples R China;

    Guangdong Univ Technol, Fac Chem Engn & Light Ind, Higher Educ Inst, Key Lab Clean Chem Technol Guangdong, Guangzhou 510006, Guangdong, Peoples R China;

    Shantou Univ, Dept Chem, Shantou 515063, Guangdong, Peoples R China;

    Guangdong Univ Technol, Fac Chem Engn & Light Ind, Higher Educ Inst, Key Lab Clean Chem Technol Guangdong, Guangzhou 510006, Guangdong, Peoples R China;

    Guangdong Univ Technol, Fac Chem Engn & Light Ind, Higher Educ Inst, Key Lab Clean Chem Technol Guangdong, Guangzhou 510006, Guangdong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    C-coated MnO2; Visible light; Room-temperature; Toluene degradation;

    机译：碳包覆MnO2;可见光;室温;甲苯降解;

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