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首页> 外文期刊>RSC Advances >Silver nanoparticles modified reduced graphene oxide wrapped Ag3PO4/TiO2 visible-light-active photocatalysts with superior performance
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Silver nanoparticles modified reduced graphene oxide wrapped Ag3PO4/TiO2 visible-light-active photocatalysts with superior performance

机译：银纳米粒子改性的石墨烯氧化物包裹的Ag3PO4 / TiO2可见光活性光催化剂具有卓越的性能

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摘要

Silver nanoparticles (Ag NPs) modified reduced graphene oxide wrapped Ag3PO4/TiO2 (Ag3PO4/TiO2/Ag-rGO, Ag-ATG) photocatalysts have been developed through a rational design that combines the optimization of charge generation, separation and transfer in the composites, which helps to increase the photocatalytic performance. The Ag-ATG composites possess novel microstructure, in which TiO2 mesoporous spheres of hundreds of nanometers in size are decorated with dense nano-sized Ag3PO4 to form pinecone-liked Ag3PO4/TiO2 particles, which were further wrapped by rGO sheets that are selectively decorated with Ag NPs. The Ag-ATG composites exhibit improved photocatalytic performance toward degradation of methylene blue (MB) and methyl orange (MO) under visible light compared to bare Ag3PO4 and Ag3PO4/TiO2/rGO (ATG). The underlying mechanism has been studied based on the results of reactive oxygen species capture experiment, photoluminescence (PL) spectra, and photocurrent measurements under visible light and monochromatic lights. The improved photocatalytic performance is mainly ascribed to the efficient spatial separation of photo-induced electrons and holes in Ag-ATG, i.e., the electrons in Ag3PO4 transfer to Ag-rGO, meanwhile the holes in Ag3PO4 transfer to TiO2. Ag NPs play an important role in the hybrid structure owing to the synergistic effect of Ag NPs and rGO, which not only enhance the light harvest but also increase the capacity of electron accepting from Ag3PO4. Meanwhile, active photo-induced electrons at the plasmonic Ag NPs can facilitate the formation of O-2(center dot-) radicals for photocatalysis. As a result, both the stability and photocatalytic active of Ag-ATG are significantly improved.
机译：通过合理的设计开发了通过合理设计开发了银纳米颗粒（Ag NPS）改性的石墨烯氧化物包裹的Ag3PO4 / TiO2（Ag3PO4 / TiO2 / Ag-Rgo，AG-ATG）光催化剂，这些设计结合了复合材料中的电荷产生，分离和转移，这有助于增加光催化性能。 Ag-ATG复合材料具有新的微观结构，其中大小尺寸的TiO2介孔球的致密纳米型Ag3PO4装饰，以形成Pinecone喜欢的Ag3PO4 / TiO2颗粒，其被选择性地装饰的RGO片材覆包。 AG NPS。与裸Ag3PO4和Ag3PO4 / TiO2 / RGO（ATG）相比，Ag-ATG复合材料表现出可见的光催化性能朝向可见光下的亚甲基蓝（MB）和甲基橙（Mo）的降解。基于可见光下的反应性氧物质捕获实验，光致发光（PL）光谱和光电流测量的结果研究了潜在的机制。改善的光催化性能主要归因于Ag-ATG中的光诱导的电子和孔的有效空间分离，即Ag3PO4转移到Ag-Rgo中的电子，同时，Ag3PO4转移到TiO 2中的孔。由于AG NPS和RGO的协同效应，AG NPS在混合结构中发挥着重要作用，这不仅增强了光收获，而且增加了从Ag3PO4的电子接受的容量。同时，等离子体Ag NPS处的活性照片诱导的电子可以促进形成用于光催化的O-2（中心点）基团。结果，显着改善了Ag-ATG的稳定性和光催化活性。

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  • 来源
    《RSC Advances》 |2016年第49期|共10页
  • 作者

    Cui Can; Qiu Yiwei; Hu Haihua; Ma Ni; Li Shuang; Xu Lingbo; Li Chaorong; Xu Jin; Tang Weihua;

  • 作者单位

    Zhejiang Sci Tech Univ Zhejiang Prov Key Lab Fiber Mat &

    Mfg Technol Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Sci Tech Univ Dept Phys Ctr Optoelect Mat &

    Devices Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Univ City Coll Hangzhou 310015 Zhejiang Peoples R China;

    Zhejiang Sci Tech Univ Dept Phys Ctr Optoelect Mat &

    Devices Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Sci Tech Univ Dept Phys Ctr Optoelect Mat &

    Devices Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Sci Tech Univ Dept Phys Ctr Optoelect Mat &

    Devices Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Sci Tech Univ Zhejiang Prov Key Lab Fiber Mat &

    Mfg Technol Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Sci Tech Univ Zhejiang Prov Key Lab Fiber Mat &

    Mfg Technol Hangzhou 310018 Zhejiang Peoples R China;

    Beijing Univ Posts &

    Telecommun State Key Lab Informat Photon &

    Opt Commun Beijing 100876 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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