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首页> 外文期刊>RSC Advances >ZIF-8 derived bimodal carbon modified ZnO photocatalysts with enhanced photocatalytic CO2 reduction performance
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ZIF-8 derived bimodal carbon modified ZnO photocatalysts with enhanced photocatalytic CO2 reduction performance

机译：ZIF-8衍生的双峰碳改性ZnO光催化剂，具有增强的光催化二氧化碳还原性能

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摘要

The use of ZnO photocatalysts is usually limited by their low specific surface area, low visible light absorption capacity and inferior photochemical stability. In this report, visible-light responsive porous ZnO photocatalysts were fabricated by calcining pre-synthesized ZIF-8 (a kind of zeolitic imidazolate framework) polyhedra as solid precursor in air at suitable calcination temperature. It was showed that the crystallographic structure of ZIF-8 precursor was basically remained up to 300 degrees C upon calcination, while phase transformation from ZIF-8 to wurtzite ZnO nanocrystals progressively proceeded above 400 degrees C. Interestingly, special bimodal carbon modifications, that is, simultaneous carbon doping and surface carbon coating, were achieved simultaneously during pyrolysis, which were confirmed by X-ray photoelectron spectroscopy, Fourier transform Raman spectroscopy and electron microscopy. The nitrogen sorption analysis indicated that the high specific surface area and mesoporous texture was partially inherited from highly porous ZIF-8. As a consequence of cooperative textural and carbon modifications, the as-prepared mesoporous ZnO photocatalyst was efficient in both CO2 capture and photocatalytic CO2 reduction towards CH3OH as a typical solar fuel under full-spectrum Xe lamp irradiation. Especially, the 500 degrees C-calcined sample manifested the highest photocatalytic CO2 reduction activity (0.83 mu mol h(-1) g(-1)), which was about six folds higher than that of hydrothermally synthesized ZnO nanorods as reference. Specifically, the superior photocatalytic CO2 reduction performance was associated with the bimodal carbon modification, high specific surface area and porous framework, which contributed to enhanced visible light harvesting, charge transport and CO2 capture.
机译：使用ZnO光催化剂通常受它们的低比表面积，低可见光吸收能力和劣质光化学稳定性的限制。在本报告中，通过在合适的煅烧温度下煅烧预合成的ZIF-8（一种沸石Imidazolate框架）Polyhedra作为固体前体来制造可见光响应多孔ZnO光催化剂。结果表明，煅烧后，ZIF-8前体的晶体结构基本上保持高达300℃，而ZIF-8的相变为次纯度ZnO纳米晶体逐渐上升至400摄氏度以上。有趣的是，特殊的双峰碳修饰，即同时碳掺杂和表面碳涂层在热解期间同时实现，其通过X射线光电子能谱，傅里叶变换拉曼光谱和电子显微镜确认。氮吸附分析表明，高比表面积和中孔纹理部分地从高度多孔ZIF-8遗传。由于合作纹理和碳修饰，所制备的介孔ZnO光催化剂在CO 2捕获和光催化二氧化碳中有效，在全光谱XE灯照射下朝向CH3OH的CH 3 OH作为典型的太阳能燃料。特别是，500摄氏度煅烧样品表现出最高光催化二氧化碳还原活性（0.83μmolH（-1）g（-1）），其比水热合成的ZnO纳米棒作为参考为高约6倍。具体地，优异的光催化二氧化碳还原性能与双峰碳改性，高比表面积和多孔框架有关，这有助于增强可见光收集，电荷传输和CO2捕获。

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  • 来源
    《RSC Advances》 |2016年第65期|共9页
  • 作者

    Liu Shengwei; Wang Jiahui; Yu Jiaguo;

  • 作者单位

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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