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首页> 外文期刊>Solar Energy >Facile anion exchange to construct uniform AgX (X = Cl, Br, I)/Ag_2CrO_4 NR hybrids for efficient visible light driven photocatalytic activity
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Facile anion exchange to construct uniform AgX (X = Cl, Br, I)/Ag_2CrO_4 NR hybrids for efficient visible light driven photocatalytic activity

机译：便捷的阴离子交换可构建均匀的AgX（X = Cl，Br，I）/ Ag_2CrO_4 NR杂化物，从而有效地驱动可见光驱动的光催化活性

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摘要

Herein, uniform AgX/Ag2Cr0.4 (X = Cl, Br, I) NR hybrids were successfully prepared by a facile in-situ anion exchange reaction at room temperature. When AgX was formed on the surface of Ag2CrO4 NRs, the light absorption range AgX/Ag2CrO4 hybrids show apparent red shifting by compared with the pure Ag2CrO4 NRs, which indicates the enhanced ability of utilizing solar energy. Moreover, the as-prepared AgBr/Ag2CrO4 NR hybrids exhibit the highest photocatalytic activity for degradation of phenol under visible light irradiation owing to more suitable band offset between AgBr and Ag(2)Cra(4) to form type-II heterojunction in comparison with the other two hybrids with type-I heterojunction. The kinetic constant over AgBr/Ag2CrO4 NR hybrids is 4 times as high as the pure Ag2CrO4 NRs, which demonstrates that the formation of heterojunction is beneficial for suppressing the recombination of photogenerated holes and electrons. Moreover, the O-rad(2)- and h(+) are proven to be main active species involving in the photocatalytic degradation of phenol. Apart from that, chlorine radicals are found to be produced simultaneously to enhance photocatalytic activity of AgCI/Ag2CrO4.
机译：本文中，通过在室温下进行简便的原位阴离子交换反应成功地制备了均匀的AgX / Ag2Cr0.4（X = Cl，Br，I）NR杂种。当在Ag2CrO4 NRs的表面上形成AgX时，与纯Ag2CrO4 NRs相比，光吸收范围AgX / Ag2CrO4杂化物显示出明显的红移，这表明提高了利用太阳能的能力。此外，由于AgBr和Ag（2）Cra（4）之间更合适的能带偏移形成II型异质结，因此制备的AgBr / Ag2CrO4 NR杂化物在可见光照射下对苯酚的降解具有最高的光催化活性。其他两个具有I型异质结的混合体。 AgBr / Ag2CrO4 NR杂化物的动力学常数是纯Ag2CrO4 NR的4倍，这表明异质结的形成有利于抑制光生空穴和电子的复合。此外，O-rad（2）-和h（+）被证明是涉及苯酚的光催化降解的主要活性物质。除此之外，发现同时产生氯自由基以增强AgCl / Ag2CrO4的光催化活性。

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  • 来源
    《Solar Energy》 |2018年第7期|392-400|共9页
  • 作者

    Zou Xuejun; Dong Yuying; Li Sijia; Ke Jun; Cui Yubo;

  • 作者单位

    Dalian Minzu Univ, Dept Environm Sci & Technol, Dalian 116600, Peoples R China;

    Dalian Minzu Univ, Dept Environm Sci & Technol, Dalian 116600, Peoples R China;

    Dalian Minzu Univ, Dept Environm Sci & Technol, Dalian 116600, Peoples R China;

    Wuhan Inst Technol, Sch Chem & Environm Engn, Wuhan 430073, Hubei, Peoples R China;

    Dalian Minzu Univ, Dept Environm Sci & Technol, Dalian 116600, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar energy utilization; Advanced oxidation process; Photocatalysis; AgX/Ag2CrO4 hybrids;

    机译：太阳能利用;高级氧化工艺;光催化;AgX / Ag2CrO4杂化;

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