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首页> 外文期刊>Applied Surface Science >Fabrication and photocatalytic activity enhanced mechanism of direct Z-scheme g-C3N4/Ag2WO4 photocatalyst
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Fabrication and photocatalytic activity enhanced mechanism of direct Z-scheme g-C3N4/Ag2WO4 photocatalyst

机译：Z型直接g-C3N4 / Ag2WO4光催化剂的制备及其光催化活性增强机理

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摘要

Herein, a direct Z-scheme graphitic carbon nitride (g-C3N4)/silver tungstate (Ag2WO4) photocatalyst was prepared by a facile in situ precipitation method using g-C3N4 as a support and silver nitrate as a precursor. X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, and elemental mapping demonstrated that beta-Ag2WO4 nanoparticles were evenly distributed on the surface of g-C3N4 nanosheets, which acted as a support for the nucleation and growth of beta-Ag2WO4 and inhibited the phase transformation of metastable beta-Ag2WO4 to stable alpha-Ag2WO4. Photocatalytic experiments indicated that the g-C3N4/Ag2WO4 nanocomposite photocatalyst displayed a better photocatalytic activity than pure g-C3N4 and Ag2WO4 toward the degradation of methyl orange. The enhanced photocatalytic performance of g-C3N4/Ag2WO4 could be well explained by a direct Z-scheme photocatalytic mechanism. This mechanism was related to the efficient space separation of photogenerated electron-hole pairs and the great oxidation and reduction capabilities of the g-C3N4/Ag2WO4 system. This work provided new insights into the design and fabrication of g-C3N4-based direct Z-scheme photocatalysts. (C) 2016 Elsevier B.V. All rights reserved.
机译：在此，以g-C3N4为载体，以硝酸银为前体，通过简便的原位沉淀法制备了直接Z型石墨氮化碳（g-C3N4）/钨酸银（Ag2WO4）光催化剂。 X射线衍射，傅立叶变换红外光谱，X射线光电子能谱，透射电子显微镜和元素图谱表明，β-Ag2WO4纳米颗粒均匀地分布在g-C3N4纳米片的表面上，为成核和形成核提供了支持。 β-Ag2WO4的生长并抑制了亚稳态β-Ag2WO4向稳定α-Ag2WO4的相变。光催化实验表明，g-C3N4 / Ag2WO4纳米复合光催化剂对甲基橙的降解表现出比纯g-C3N4和Ag2WO4更好的光催化活性。 g-C3N4 / Ag2WO4增强的光催化性能可以通过直接的Z方案光催化机理很好地解释。该机理与光生电子-空穴对的有效空间分离以及g-C3N4 / Ag2WO4体系的强氧化还原能力有关。这项工作为基于g-C3N4的直接Z方案光催化剂的设计和制造提供了新的见识。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第ptab期|175-183|共9页
  • 作者

    Zhu Bicheng; Xia Pengfei; Li Yao; Ho Wingkei; Yu Jiaguo;

  • 作者单位

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China|Hong Kong Inst Educ, Dept Sci & Environm Studies, Tai Po, Hong Kong, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China;

    Hong Kong Inst Educ, Dept Sci & Environm Studies, Tai Po, Hong Kong, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China|King Abdulaziz Univ, Dept Phys, Fac Sci, Jeddah 21589, Saudi Arabia;

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  • 正文语种 eng
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  • 关键词

    Direct Z-scheme; g-C-3 N-4; beta-Ag2WO4; Methyl orange; Degradation;

    机译：直接Z方案;g-C-3 N-4;β-Ag2WO4;甲基橙;降解;

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