微波加热法制备Ag/TiO2及光催化降解气相甲苯

doi:10.3724/SP.J.1077.2010.00365

摘要/Abstract

摘要： 以钛酸四丁酯为钛源, 分别使用微波加热法和水热法制备Ag改性的TiO₂, 采用X射线衍射(XRD)、X射线荧光探针(XRF)、紫外可见漫反射(UV-Vis)和扫描电镜(SEM)对其进行表征. 以气相甲苯为降解对象, 分别在紫外和可见光辐照下, 对样品进行光催化活性试验. 结果表明：与水热法比较, 微波加热法更有利于Ag对TiO₂微观结构的改性, 所制备的Ag改性TiO₂包含了锐钛矿、金红石和板钛矿三种晶相, 其粒径更小(16.4nm)、孔道结构更丰富、团聚体更小(80～200nm)、带隙能更低(2.87eV), 表现出对气相甲苯更有效的紫外光和可见光降解能力.

关键词: 二氧化钛, 微波, 银改性

Abstract: Using Ti(OBu)₄ as titanium source, Agmodified TiO₂ was prepared by the microwave heating method and the hydrothermal ethod, respectively, and was characterized by Xray diffraction (XRD), Xray fluorescence (XRF), ultravioletvisible diffuse reflectance spectroscope (UV-Vis) and scanning electron microscope (SEM). The photocatalytic activity of the samples was tested in the degradation of gaseous toluene under UV and visible light irradiation, respectively. The results showed that the presence of Ag promoted the phase transformation of TiO2 from anatase to other phases. Compared with the hydrothermal method, the microwave heating method had more positive effect on the formation of Agmodified TiO₂ with smaller crystallite size (16.4nm) and aggregate (80-200nm), more phases structure (anatase, rutile and brookite), richer channel structure, and lower band gap energy (2.87eV). Furthermore, Agmodified TiO₂ prepared by the microwave heating method exhibited a better photocatalytic activity in the degradation of toluene under UV or visible light irradiation.

Key words: titanium dioxide, microwave, Agmodified

中图分类号:

O643

李晓斌,陆晓华. 微波加热法制备Ag/TiO₂及光催化降解气相甲苯[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2010.00365.

LI Xiao-Bin,LU Xiao-Hua. Microwave Heating Preparation of Agmodified TiO₂ for Photocatalytic Degradation of Gaseous Toluene[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00365.

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微波加热法制备Ag/TiO₂及光催化降解气相甲苯

Microwave Heating Preparation of Agmodified TiO₂ for Photocatalytic Degradation of Gaseous Toluene

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