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首页> 外文期刊>Materials Science and Engineering >The enhanced photocatalytic activity of ZnO nanorods/CuO nanourchins composite prepared by chemical bath precipitation
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The enhanced photocatalytic activity of ZnO nanorods/CuO nanourchins composite prepared by chemical bath precipitation

机译：用化学浴沉淀制备的ZnO纳米棒/ CuO纳米镍复合材料的增强的光催化活性

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摘要

In this work, ZnO nanorods (NRs)/CuO nanourchins (NUs) were composed together to achieve the highest efficiency in methylene blue (MB) degradation. The nanocomposites were fabricated via a one-step, facile, and solution-based method named chemical bath precipitation. Crystal structures of hexagonal ZnO NRs and monoclinic CuO NUs phases were detected by X-ray diffraction (XRD) analysis, while field emission scanning electron microscopy (FESEM) confirmed the formation of ZnO NRs and CuO NUs with favorable inter-connectivity. The chemical bonding stage of the Cu~(2+), Zn~(2+), and O~(2-) were investigated with high-resolution X-ray photoelectron spectroscopy (HRXPS). Brunauer-Emmett-Teller (BET) method depicted a relatively wide pore size distribution for all the samples. Diffuse reflectance spectroscopy (DRS) demonstrated that band gap energy of ZnO NRs further narrowed by raising CuO concentration owing to the formation of the Cu(3d) energy state near the Zn(3d) valance band. Photoluminescence (PL) spectra revealed that the combination of ZnO NRs with CuO NUs significantly increased the lifetime of the photo-excited charge carriers. The ZnO/(10 mol％)CuO nanocomposite with the band gap energy of 2.9 eV and pore volume of 0.0180 cm~3/g exhibited the highest efficiency and complete degradation of MB in less than 240 min. The photo-degradation kinetics of the as-prepared nanocatalyst followed a pseudo-first-order reaction model and exhibited about 12 times faster than ZnO. Finally, the photo-degradation mechanisms are proposed based on the role of reactive oxygen species and photo-generated charge carriers.
机译：在这项工作中，ZnO纳米棒（NRS）/ CuO纳米锡（NUS）组成在一起以达到亚甲基蓝（MB）降解的最高效率。通过单步，容易的和基于溶液的方法制造纳米复合材料，该方法称为化学浴沉淀。通过X射线衍射（XRD）分析检测六方ZnO NRS和单斜晶CuO NUS阶段的晶体结构，而场发射扫描电子显微镜（FESEM）证实了ZnO NRS和CuO NU的形成，具有良好的连接性。用高分辨率X射线光电子能谱（HRXPS）研究了Cu〜（2+），Zn〜（2+）和O〜（2-）的化学键键。 Brunauer-Emmett-Teller（Bet）方法描绘了所有样品的相对宽的孔径分布。漫反射光谱（DRS）证明ZnO NRS的带隙能量进一步通过提高CUO浓度而进一步变窄，因为由于Zn（3D）遵循附近的Cu（3D）能量状态而升高。光致发光（PL）光谱显示，ZnO NRS与CuO NUS的组合显着增加了光兴奋剂载体的寿命。具有2.9eV的带隙能量的ZnO /（10mol％）CuO纳米复合材料为2.9eV和0.0180cm〜3 / g的孔隙体积的最高效率和少于240分钟的Mb的完全降解。由制备的纳米催化剂的光降解动力学遵循伪第一阶反应模型，并比ZnO速度快约12倍。最后，基于反应性氧物质和光产生的电荷载体的作用提出了光降解机制。

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  • 来源
    《Materials Science and Engineering》 |2021年第9期|115262.1-115262.9|共9页
  • 作者

    Mohammad Nami; Amirhossein Rakhsha; Saeed Sheibani; Hossein Abdizadeh;

  • 作者单位

    School of Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran Iran;

    School of Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran Iran Department of Chemical Engineering McMaster University Hamilton Ontario Canada;

    School of Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran Iran;

    School of Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran Iran;

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  • 正文语种 eng
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  • 关键词

    ZnO; CuO; Nanocomposite; Photocatalyst; Photodegradation;

    机译：Zno;cuo;纳米复合材料;光催化剂;光降解;

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