A novel preparation of mesoporous CsxH3−xPW12O40/TiO2 nanocomposites with enhanced photocatalytic activity

光催化 甲基橙 纳米复合材料 材料科学 罗丹明B 拉曼光谱 漫反射红外傅里叶变换 锐钛矿 介孔材料 傅里叶变换红外光谱 光谱学 化学工程 核化学 分析化学(期刊) 纳米技术 化学 催化作用 有机化学 工程类 物理 光学 量子力学
作者
Xiaodan Yu,Yingna Guo,Leilei Xu,Yang Xia,Yihang Guo
出处
期刊:Colloids and Surfaces A: Physicochemical and Engineering Aspects [Elsevier BV]
卷期号:316 (1-3): 110-118 被引量:28
标识
DOI:10.1016/j.colsurfa.2007.08.046
摘要

Nanocomposite photocatalysts, cesium hydrogen salts of 12-tungstophosphoric acid coupled with anatase TiO2 (CsxH3−xPW12O40/TiO2, x = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0, respectively), were prepared via one-step sol–gel method followed by hydrothermal treatment at 200 °C with a heating ramp of 2 °C/min. Several characterization techniques, UV–vis diffuse reflectance spectroscopy (UV–vis/DRS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) patterns, Raman scattering spectroscopy, field emission scanning electron microscopy (FESEM), and N2 adsorption/desorption analysis, were combined to confirm the structure integrity of the Keggin units in the composites and investigate the phase structure and optical absorption properties, morphology, and surface textural properties of the composites. The photocatalytic activities of CsxH3−xPW12O40/TiO2 were evaluated by the degradation of three model organic molecules including 4-nitrophenol (4-NP), methyl orange (MO), and rhodamine B (RB) under UV-light irradiation. For comparison, the photocatalytic activities of the parent CsxH3−xPW12O40 and Degussa P25 were studied under the same conditions. The results showed that as-prepared nanocomposite photocatalysts were substantially more effective than the starting CsxH3−xPW12O40 and Degussa P25. The high photoactivities of as-prepared nanocomposites could be attributed to the higher surface acidity, mesoporosity, and the synergistic effect existed between the CsxH3−xPW12O40 and the TiO2 matrix.
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