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Facile preparation of Z-scheme WO3/g-C3N4 composite photocatalyst with enhanced photocatalytic performance under visible light

被引：344
作者：
Cui, Lifeng [1 ]
Ding, Xiang [2 ]
Wang, Yangang [2 ]
Shi, Huancong [2 ]
Huang, Lihua [2 ]
Zuo, Yuanhui [2 ]
Kang, Shifei [2 ]
机构：
[1] Dongguan Univ Technol, Sch Chem & Environm Engn, Dongguan 523808, Guangdong, Peoples R China
[2] Univ Shanghai Sci & Technol, Dept Environm Sci & Engn, Shanghai 200093, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2017年 / 391卷
基金：
中国国家自然科学基金;
关键词：
WO3/g-C3N4; Mixing and annealing; Heterojunctions; Z-scheme charge carrier transfer; Visible light photocatalysis; GRAPHITIC CARBON NITRIDE; HYDROGEN EVOLUTION; WO3; G-C3N4; OXIDATION; PHOTODEGRADATION; DECOMPOSITION; ACETALDEHYDE; DEGRADATION; MECHANISMS;
D O I：
10.1016/j.apsusc.2016.07.055
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070305 [高分子化学与物理];
摘要：
Visible-light-driven WO3/g-C3N4 composites photocatalysts were synthesized via a facile one-step simultaneously heating procedure with urea as the main precursor. These prepared catalyst samples were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), transmission electron microscopy (TEM), N-2 adsorption, ultraviolet-visible diffuse reflection spectroscopy (UV-vis), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and electrochemical impedance spectroscopy (EIS). The photocatalytic activity of the WO3/g-C3N4 composites was evaluated by the photo-degradation of Rhodamine B (RhB) under visible light irradiation. The results indicated that the composites with 25"wt.% WO3 content exhibited highest photocatalytic activity compared to pure WO3, bare g-C3N4 and other WO3/g-C3N4 composites. The favorable photocatalytic activity of WO3/g-C3N4 composites was mainly attributed to the excellent surface properties, enhanced visible-light absorption and the desirable band positions. A possible Z-scheme photocatalytic mechanism was proposed based on structure and electrochemical characterizations results, which can well explain the enhanced migration rate of photogenerated electrons and holes in WO3/g-C3N4 heterojunctions. (C) 2016 Elsevier B.V. All rights reserved.
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页码：202 / 210
页数：9
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