非水解溶胶-凝胶法制备TiO_2光催化薄膜  

PREPARATION AND PHOTOCATALYTIC PROPERTIES OF TiO_2 THIN FILMS BY THE NON-HYDROLYTIC SOL-GEL METHOD

作　　者：江伟辉[1] 包镇红[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院,江西景德镇333001

出　　处：《硅酸盐学报》2007年第11期1508-1513,共6页Journal of The Chinese Ceramic Society

基　　金：教育部"新世纪优秀人才支持计划"(NCET-05-0578);江西省自然科学基金(0150042)资助项目。

摘　　要：以TiCl_4为前驱体,无水乙醇为氯供体,聚乙二醇(polyethyleneglycol,PEG)为成膜控制剂,通过非水解溶胶-凝胶法制备了TiO_2光催化薄膜。应用X射线衍射和热重-差式扫描量热研究了TiO_2凝胶在热处理过程中的物相变化。采用场发射扫描电镜和光照甲基橙的降解实验研究了TiCl_4浓度和镀膜次数对TiO_2薄膜显微结构和光催化活性的影响。结果表明:非水解溶胶-凝胶法制备的TiO_2薄膜开始出现金红石相的温度为750℃,高于传统水解溶胶-凝胶法制备的薄膜。TiCl_4浓度和PEG用量是影响薄膜结构和光催化性能的关键因素。当TiCl_4浓度为0.83mol/L,PEG与TiCl_4摩尔比为0.1时,所制备的薄膜是一种晶粒细小且孔隙及孔径分布均匀的多孔膜,这有利于提高薄膜的比表面积,薄膜具有最佳的光催化性能。TiO2 photocatalytic thin films were prepared by the non-hydrolytic sol-gel method using TiCl4 as precursor, absolute ethanol as oxygen donor and polyethylene glycol （PEG） as film-forming agent. The phase change of TiO2 xerogel during annealing was studied by X-ray diffraction and thermogravimetry-differential scanning calorimetry. The effects of TiCl4 concentration and coating times on the microstructures and photocatalytic activity of TiO2 film were investigated by field emission scanning electron microscopy and photocatalytic degradation of methyl orange under ultraviolet irradiation. The results indicate that the rutile begins to appear at 750 ℃ in the films prepared by the non-hydrolytic sol-gel. The temperature is higher than that of the rutile in the film made by the traditional hydrolytic sol-gel method. The TiCl4 concentration and PEG content are the key factors influencing the microstructure and the photocatalytic property of the TiO2 films. When the TiCl4 concentration is 0.83 mol/L and the molar ratio of PEG to TiCl4 is 0.1, the porous film prepared has fine-grain and well-distributed micropores and even pore sizes, larger specific areas and the best photocatalytic property.

关 键 词：四氯化钛 非水解溶胶-凝胶法 二氧化钛薄膜 光催化 

分 类 号：TQ174[化学工程—陶瓷工业]