Facile preparation of Z-scheme WO3/g-C3N4 composite photocatalyst with enhanced photocatalytic performance under visible light
Facile preparation of Z-scheme WO3/g-C3N4 composite photocatalyst with enhanced photocatalytic performance under visible light
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DOI：
10.1016/j.apsusc.2016.07.055
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发表时间：
2017-01-01
影响因子：
6.7
通讯作者：
Kang, Shifei
中科院分区：
文献类型：
--
作者：
Cui, Lifeng;Ding, Xiang;Kang, Shifei
以尿素为主要前驱体，采用一步同时升温法制备了可见光驱动的WO 3/g-C3 N4复合光催化剂。采用X射线衍射（XRD）、热重分析（TG）、透射电子显微镜（TEM）、氮吸附、紫外-可见漫反射光谱（UV-vis）、X射线光电子能谱（XPS）、光致发光（PL）和电化学阻抗谱（EIS）对催化剂进行了表征。以罗丹明B（RhB）为目标化合物，在可见光照射下考察了复合材料的光催化活性。结果表明，具有25“wt.%与纯WO 3、裸g-C3 N4和其他WO 3/g-C3 N4复合材料相比，WO 3的含量表现出最高的光催化活性。WO 3/g-C3 N4复合材料良好的光催化活性主要归因于优良的表面性质、增强的可见光吸收和理想的能带位置。基于结构和电化学表征结果，提出了一种可能的Z型光催化机理，该机理可以很好地解释WO 3/g-C3 N4异质结中光生电子和空穴迁移速率的增强。(C)© 2016 Elsevier B. V.版权所有。
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.