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首页> 外文期刊>Chemical engineering journal >Oxygen vacancy-rich ultrathin sulfur-doped bismuth oxybromide nanosheet as a highly efficient visible-light responsive photocatalyst for environmental remediation
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Oxygen vacancy-rich ultrathin sulfur-doped bismuth oxybromide nanosheet as a highly efficient visible-light responsive photocatalyst for environmental remediation

机译：富氧空位的超薄硫掺杂铋氧杂物纳米片作为一种高效的可见光响应光催化剂进行环境修复

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摘要

Designing ultrathin two-dimensional (2D) defective materials and metal-free doped materials as photocatalysts both have received enormous attentions in the field of environmental remediation due to their great potential for removing colorless contaminants. However, whether the synergism of defects and metal-free doping exists and the corresponding oxidative mechanism is unclear, which retard further developments of high performance catalysts. Here, a novel oxygen vacancy (OV)-rich ultrathin sulfur-doped BiOBr nanosheet (BB-xS) was synthesized through a facile one-step solvothermal method. Under visible light irradiation, the optimal BB-5S sample exhibited 98% degradation efficiency of 4-chlorophenol (4-CP) within 120 min, which was 4.9 and 18.0 times greater than that of pristine ultrathin BiOBr and oxygen vacancy-poor sulfur-doped BiOBr, respectively. Also, this excellent photoactivity could extend to other colorless organic contaminants, such as bisphenol analogues and sulfonamides, verifying the universal applicability of BB-xS. Based on experimental results and density functional theory (DFT) calculations, it was manifested that a sub-band was generated via the synergistic effect of oxygen vacancies and sulfur doping, and it greatly enhanced the visible-light absorption capability and suppressed the photoinduced charge recombination, which would be beneficial to improve the photocatalytic activity. Additionally, the corresponding photocatalytic degradation pathway of 4-CP was also proposed. This work can provide a new protocol for the design and construction of highly active photocatalysts toward environmental remediation.
机译：设计超薄二维（2D）有缺陷的材料和无金属掺杂材料，因为它们由于其巨大的潜力而导致环境修复领域的巨大关注。然而，是否存在缺陷和无金属掺杂的协同作用，并且相应的氧化机制尚不清楚，这延迟了高性能催化剂的进一步发展。这里，通过容易的一步溶液方法合成了一种新的氧空位（OV）-RICH硫掺杂BioBR纳米晶片（BB-XS）。在可见光照射下，最佳BB-5S样品在120分钟内表现出4-氯苯酚（4-CP）的98％降解效率，比原始超薄BioBR和氧空位贫硫掺杂的4.9％和18.0倍Biobr分别。此外，这种优异的光度可延伸到其他无色有机污染物，例如双酚类似物和磺酰胺，验证BB-XS的普遍适用性。基于实验结果和密度泛函理论（DFT）计算，表现出通过氧空位和硫掺杂的协同效应产生的子带，并且它大大提高了可见光吸收能力并抑制了光诱导的电荷重组，改善光催化活性是有益的。另外，还提出了4-CP的相应光催化降解途径。这项工作可以为设计和构建高活跃的光催化剂朝向环境修复提供新的协议。

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  • 来源
    《Chemical engineering journal》 |2019年第2019期|共10页
  • 作者

    Wang Qiao; Liu Zhiquan; Liu Dongmei; Wang Wei; Zhao Zhiwei; Cui Fuyi; Li Guibai;

  • 作者单位

    Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Chongqing Univ Coll Urban Construct &

    Environm Engn Chongqing 400044 Peoples R China;

    Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    Ultrathin two-dimensional nanosheets; Oxygen vacancy; Sulfur-doped; Photocatalytic degradation; Colorless organic contaminants;

    机译：超薄二维纳米片;氧气空位;硫掺杂;光催化降解;无色有机污染物;

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