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首页> 外文期刊>Applied Surface Science >Enhancement in visible light-responsive photocatalytic activity by embedding Cu-doped ZnO nanoparticles on multi-walled carbon nanotubes
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Enhancement in visible light-responsive photocatalytic activity by embedding Cu-doped ZnO nanoparticles on multi-walled carbon nanotubes

机译：通过将Cu掺杂的ZnO纳米粒子嵌入多壁碳纳米管上来增强可见光响应光催化活性

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摘要

Copper doped ZnO nanoparticles embedded on multi-walled carbon nanotubes (CNTs) were successfully synthesized using a facile, nontoxic sol method. The resulting visible light-responsive Cu-doped ZnO/CNTs composites were characterized using powder X-ray diffraction (XRD), high resolution transmission electron microscope (HR-TEM), transmission electron microscope (TEM), scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS) and Brunauer Emmett Teller (BET) surface area analyzer. Optical properties of Cu-doped ZnO/CNTs nanocomposites, studied using UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy (PL), which exhibited extended light absorption in visible light region and possessed better charge separation capability, respectively as compared to Cu-doped ZnO, pure ZnO and ZnO/CNTs composite. The photocatalytic activity was tested by degradation of methyl orange (MO) dye under visible light irradiation. The results demonstrated that Cu-doped ZnO/CNTs nanocomposites effectively bleached out MO, showing an impressive photocatalytic enhancement over ZnO, commercial ZnO, Cu-doped ZnO nanoparticles and ZnO/CNTs nanocomposites. Chemical oxygen demand (COD) of textile wastewater was also measured before and after the photocatalysis experiment under sunlight to evaluate the mineralization of wastewater. The significant decrease in COD of the treated effluent revealed a complete destruction of the organic molecules along with color removal. This dramatically enhanced photoactivity of nanocomposite photocatalysts was attributed to greater adsorptivity of dyes, extended light absorption and increased charge separation efficiency due to excellent electrical properties of carbon nanotubes and the large surface area.
机译：使用简便，无毒的溶胶法成功合成了嵌入多壁碳纳米管（CNT）上的铜掺杂ZnO纳米颗粒。使用粉末X射线衍射（XRD），高分辨率透射电子显微镜（HR-TEM），透射电子显微镜（TEM），扫描电子显微镜（SEM）对所得可见光响应的掺杂Cu的ZnO / CNTs复合材料进行表征。能量色散X射线分析（EDX），X射线光电子能谱（XPS）和Brunauer Emmett Teller（BET）表面积分析仪。使用紫外可见漫反射光谱法和光致发光光谱法（PL）研究了掺Cu的ZnO / CNTs纳米复合材料的光学性能，与掺Cu的ZnO相比，它们在可见光区域具有扩展的光吸收能力并具有更好的电荷分离能力，纯ZnO和ZnO / CNTs复合材料。通过在可见光照射下降解甲基橙（MO）染料来测试光催化活性。结果表明，Cu掺杂的ZnO / CNTs纳米复合材料有效地漂白了MO，与ZnO，商用ZnO，Cu掺杂的ZnO纳米颗粒和ZnO / CNTs纳米复合材料相比，光催化性能得到了显着提高。在阳光下进行光催化实验之前和之后，还测量了纺织废水中的化学需氧量（COD），以评估废水的矿化度。处理后的废水中COD的显着降低表明有机分子被完全破坏，同时脱色。纳米复合光催化剂的这种显着增强的光活性归因于染料的更高的吸附性，扩展的光吸收和归因于碳纳米管出色的电性能和较大的表面积。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|702-712|共11页
  • 作者

    M. Ahmad; E. Ahmed; Z.L. Hong; X.L. Jiao; T. Abbas; N.R.Khalid;

  • 作者单位

    Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan,State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan;

    State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China;

    State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China;

    Institute of Industrial Control System, Rawalpindi, Pakistan;

    Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan,State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China;

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  • 正文语种 eng
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  • 关键词

    Cu-doped ZnO; Photocatalysis; Methyl orange; Carbon nanotubes; COD;

    机译：铜掺杂的ZnO;光催化;甲基橙;碳纳米管;化学需氧量;

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