Thermodecomposition synthesis of WO3/H2WO4 heterostructures with enhanced visible light photocatalytic properties
Thermodecomposition synthesis of WO3/H2WO4 heterostructures with enhanced visible light photocatalytic properties
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热分解合成具有增强可见光催化性能的WO3/H2WO4异质结构
DOI：
10.1016/j.apcatb.2011.10.010
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发表时间：
2012-01-12
影响因子：
22.1
通讯作者：
Chen, Shifu
中科院分区：
文献类型：
--
作者：
Cao, Jing;Luo, Bangde;Chen, Shifu
通过简单的热分解方法合成了不同WO 3含量的新型WO 3/H2 WO 4异质结构。采用热重-差热分析（TG-DTA）、X射线粉末衍射（XRD）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（DRS）和N2吸附-脱附等温线等方法对样品的结构、形貌、光学性能和比表面积进行了研究。以罗丹明B（RhB）为降解对象，考察了样品在可见光（λ> 420 nm）照射下的光催化活性。当WO 3质量分数为51.04%时，WO 3/H2 WO 4异质结构的光催化活性最高，表观k（app）为0.0330min（-1）。WO 3/H2 WO 4光催化活性的提高可能是由于WO 3和H2 WO 4之间形成异质结，抑制了光生电子-空穴对的复合。此外，自由基清除剂实验证实O-中心点（2）-和h（+）是RhB降解的主要活性物种。(C)2011 Elsevier B. V.保留所有权利。
Novel WO3/H2WO4 heterostructures with different contents of WO3 were synthesized through a simple thermodecomposition method. Thermogravimetry and differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), UV-vis diffuse reflectance spectroscopy (DRS) and N-2 adsorption and desorption isotherms were employed to study the structures, morphologies, optical properties and specific surface area of the as-prepared samples. Degradation of rhodamine B (RhB) was carried out to evaluate the photocatalytic activity of samples under visible light irradiation (lambda > 420 nm). WO3/H2WO4 heterostructure with 51.04 wt% WO3 presented the highest photocatalytic activity with apparent k(app) of 0.0330 min(-1). The increased photocatalytic activity of WO3/H2WO4 could be attributed to the formation of the heterojunction between WO3 and H2WO4, which suppresses the recombination of photoinduced electron-hole pairs. Moreover, the tests of radical scavengers confirmed that O-center dot(2)- and h(+) were the main reactive species for the degradation of RhB. (C) 2011 Elsevier B.V. All rights reserved.