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Carbon wrapped and doped TiO2 mesoporous nanostructure with efficient visible-light photocatalysis for NO removal

机译：碳包裹和掺杂的TiO2介孔纳米结构，具有有效的可见光光催化作用，可去除NO

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摘要

Carbon wrapped and doped mesoporous anatase TiO2 nanocrystals were prepared by a hydrothermal approach in acetic acid aqueous containing chitosan. A designed post-thermal treatment was employed to enhance the incorporation between carbon and TiO2. After hydrothermal process, mesoporous anatase TiO2 formed with wrapped by a few layers of carbon shell. Here chitosan was used as not only the template for the formation of mesopores, but also the carbon source toward the carbon layers coating. Furthermore, chitosan provided doping element into TiO2 lattice and induced to form Ti-C bond which caused Ti(III) with oxygen vacancies. The Ti(III)-oxygen vacancy are partly responsible for visible-light response and high photocatalytic activity, which can accelerate electron transfer thus inhibit photogenerated charge recombination. The photocatalytic activity was evaluated using photo-oxidation of gaseous NO under visible light irradiation as the probe reaction. In the optimum result, 71% of NO with starting concentration at ppb level was photo-degraded. Our results also showed that the photogenerated electrons played a key role in photodegradation of NO, as a result, the environmental humidity level had a negligible effect on the photocatalysis. (C) 2016 Elsevier B.V. All rights reserved.
机译：碳包裹和掺杂的介孔锐钛矿型TiO2纳米晶体是通过在含有壳聚糖的乙酸水溶液中进行水热法制备的。设计的后热处理用于增强碳和TiO2之间的结合。经过水热处理后，形成的介孔锐钛矿型TiO2被几层碳壳包裹。在此，壳聚糖不仅用作中孔形成的模板，而且还用作朝向碳层涂层的碳源。此外，壳聚糖向TiO2晶格中提供了掺杂元素，并诱导形成Ti-C键，从而导致Ti（III）的氧空位。 Ti（III）-氧空位部分负责可见光响应和高光催化活性，这可以加速电子转移，从而抑制光生电荷的重组。使用可见光照射下的气态NO的光氧化作为探针反应来评价光催化活性。在最佳结果中，起始浓度为ppb的NO中有71％被光降解。我们的结果还表明，光生电子在NO的光降解中起关键作用，因此，环境湿度水平对光催化的影响可忽略不计。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第ptab期|318-325|共8页
  • 作者

    He Di; Li Yongli; Wang Inshu; Wu Junshu; Yang Yilong; An Qier;

  • 作者单位

    Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;

    Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbon wrapped and doped TiO2 (CWDTO); Mesoporous nanostructure; Photocatalysis; NO removal;

    机译：碳包裹和掺杂的TiO2（CWDTO）;中孔纳米结构;光催化;去除NO;

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