磷钨酸修饰的纳米TiO_2薄膜的制备及光催化性能  

Preparation of nano TiO_2 film modified with phosphatotungstic acid and photocatalytic performance

作　　者：刘士荣 毛明富 倪忠斌 陈明清 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214000

出　　处：《功能材料》2010年第2期346-349,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20671043)

摘　　要：以钛酸四丁酯为前驱物,乙酸为溶剂,用溶胶-凝胶法制备了磷钨酸修饰的纳米TiO2薄膜(PW12/TiO2)。通过FT-IR、UV-Vis、XRD、BET、SEM进行了表征。结果表明,磷钨酸修饰的纳米TiO2具有锐钛矿晶型和较大的比表面积,磷钨酸在TiO2中仍保持Keggin结构,并抑制了粒子烧结过程中的长大。研究了PW12/TiO2薄膜在对氯苯酚光降解中的催化活性。当磷钨酸与TiO2的摩尔比为0.02∶1,240℃焙烧,PW12/TiO2薄膜的光催化降解反应遵循L-H机理,一级反应速率常数为0.016min-1。磷钨酸与TiO2在光催化反应中有明显的协同作用。The nano TiO_2 film modified with phosphatotungstic acid（PW12/TiO_2）was prepared by sol-gel method using tetrabutyl titanate（TBOT） as a precursor and acetic acid as solvent,and was characterized by FTIR,UV-Vis,XRD,BET and SEM.The result indicates that the TiO_2 nanoparticles has the anatase structure and high specific surface.Phosphatotungstic acid still keeps Keggin structure in TiO_2 and inhibites the growth of crystal grain.The photocatalysis degradation of p-chlorophnol with PW12/TiO_2 film was investigated to study the catalytic activities of the film.The result indicated that photocatalysis reaction accorded to L-H mechanism with PW12/TiO_2 film（the ratio of phosphatotungstic acid and titania was 0.02∶1,calcinated at 240℃）,First-order reaction rate constant was 0.016min-1.There produced obvious synergy between PW12 and TiO_2 in photocatalysis reaction.

关 键 词：溶胶-凝胶法 光催化 TIO2薄膜 磷钨酸 

分 类 号：O614.41[理学—无机化学] O614.61[理学—化学]