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Enhanced photocatalytic activity of ZnO sensitized by carbon quantum dots and application in phenol wastewater

机译：碳量子点敏化的ZnO的光催化活性增强及其在苯酚废水中的应用

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摘要

This work reports on preparation of ZnO composites sensitized by carbon quantum dots (CQDs) and its photocatalytic degradation on phenol under visible-light illumination. With the help of tools such as transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, X-ray photoelectron spectroscopy (XPS), UV vis diffusive reflectance spectra (UV Vis DRS) and gas chromatograph-mass spectrometer (GC-MS), successful synthesis of ZnO composites sensitized by CQDs has been confirmed, which extend the spectral response range of the procatalyst to the visible region enhancing the utilization of sunlight. Meanwhile, transient photocurrent response and Nyquist plot analysis were further proved the increase in carrier separation efficiency of the procatalyst. The photocatalytic ability of the composites was measured by XPA-7 photocatalytic instrument with using phenol as simulate pollutants. And the photocatalytic reaction mechanism was also revealed by the Mott-Schottky plot, band structure and trapping experiments of active species. The results exhibit that the photocatalytic performance of ZnO composites sensitized by CQDs is 60% higher than that of pure ZnO with good stability and reusability, whose utilization has almost no significant change after 10 cycles.
机译：这项工作报道了碳量子点（CQDs）敏化的ZnO复合材料的制备及其在可见光下对苯酚的光催化降解。借助诸如透射电子显微镜（TEM），X射线衍射（XRD），傅里叶变换红外（FT-IR）光谱，X射线光电子能谱（XPS），UV可见漫反射光谱（UV Vis DRS）之类的工具）和气相色谱质谱仪（GC-MS），已证实成功合成了由CQD敏化的ZnO复合材料，这将前催化剂的光谱响应范围扩展到可见光区域，从而增强了对阳光的利用。同时，瞬态光电流响应和奈奎斯特图分析进一步证明了前催化剂载流子分离效率的提高。以苯酚为模拟污染物，通过XPA-7光催化仪测定了复合材料的光催化能力。通过Mott-Schottky图，能带结构和活性物种的俘获实验也揭示了光催化反应机理。结果表明，CQDs敏化的ZnO复合材料的光催化性能比纯ZnO高60％，具有良好的稳定性和可重复使用性，其利用率在10个循环后几乎没有明显变化。

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  • 来源
    《Optical Materials》 |2020年第2期|109674.1-109674.9|共9页
  • 作者

    Liang Huiqin; Tai Xiumei; Du Zhiping; Yin Yanji;

  • 作者单位

    China Res Inst Daily Chem Co Ltd Shanxi Key Lab Surfactants Taiyuan 030001 Shanxi Peoples R China;

    China Res Inst Daily Chem Co Ltd Shanxi Key Lab Surfactants Taiyuan 030001 Shanxi Peoples R China|Shanxi Univ Inst Resources & Environm Engn Taiyuan 030006 Shanxi Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ZnO; L-CQDs; Composites; Photocatalysis; Phenol;

    机译：氧化锌;L-CQD;复合材料;光催化;苯酚;

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