PEG1000用量对多孔TiO_2薄膜结构及光催化性能的影响  

Influence of PEG1000 amount on structure and photocatalytic activity of the porous TiO_2 film

作　　者：张文杰[1] 白佳威[1] 曲彦亮[1] 刘文彬[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《功能材料》2011年第B04期256-259,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50774074);国家重点基础研究发展计划(973计划)资助项目(2005CB121104)

摘　　要：以钛酸四丁酯为钛源,PEG1000为模板剂,乙酰丙酮为稳定剂,制备了TiO2溶胶,通过浸渍-提拉法在载玻片上制备了多孔TiO2薄膜。采用X射线衍射、扫描电镜、紫外-可见透射光谱、X射线光电子能谱、N2吸附-脱附等对TiO2薄膜的晶相结构、表面形貌、化学组成及TiO2粉体的BET比表面积和孔径分布进行了表征。考察了TiO2薄膜对甲基橙的光催化降解活性。实验结果表明,TiO2薄膜催化剂的晶型为锐钛矿型,Ti以Ti4+形式存在。随着PEG1000添加量的增加,薄膜表面形貌变得粗糙,孔数量先增加而后下降;多孔TiO2薄膜在紫外区域内的吸收边沿向短波方向移动,薄膜透射率也发生波动,但薄膜的厚度基本不变。当PEG1000添加量为2.0g时,薄膜中存在大量的介孔,薄膜的比表面积最大,光催化性能最佳。TiO2 sol was prepared by sol-gel technique using tetrabutyl utanate as precursor, PEG1000 as template, and acetyl acetone as stabilizer. The films were fabricated by dip-coating method on the glass slides. The crystalline structure, surface morphology, composition, transmittance, BET surface area and pore size distribu- tion of the samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS）, UV-Vis spectrophotometer, and Nz-adsorption and desorption. Photocata- lyric degradation of methyl orange on the films under UV-light irradiation was investigated. The TiO2 film was in the anatase phase while Ti was in the Ti4＋ state. With increasing amount of PEG1000, surface morphology of the films became rough, and pore size of the powders increased first and then decreased later. The absorption edge of the films in the UV region moved to short wavelength accompanied with fluctuation of transmittance, while film thickness maintained stable. PEG1000 had its optimum doping amount of 2 g when a lot of mesopores appeared in the film performing the largest surface area and optimum photoeatalytie activity.

关 键 词：多孔TiO2薄膜 溶胶-凝胶 PEG1000 甲基橙 光催化 

分 类 号：O643[理学—物理化学]