锐钛矿-金红石混晶TiO_2溶胶的制备及光催化性能  

Preparation of TiO_2 Sol Containing Anatase-Rutile Mischcrystal Grains and Its Photocatalytic Activity

作　　者：杨辉[1,2] 申乾宏[1] 高基伟[1,2] 

机构地区：[1]浙江大学材料与工程学系,浙江杭州310027 [2]浙江大学绿色建材与应用技术工程研究中心,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期201-204,共4页Rare Metal Materials and Engineering

基　　金：浙江省科技计划(2005C24005)

摘　　要：采用溶胶-凝胶法,通过对pH值的调节,获得了含有锐钛矿-金红石混晶晶粒的二氧化钛溶胶,并由浸渍提拉法常温制备出相应的结晶二氧化钛薄膜。利用X射线衍射(XRD)、透射电镜(TEM)、紫外可见光谱(UV-Vis)等研究手段对溶胶和薄膜进行了分析,并对薄膜的光催化活性进行了考察。结果表明:较低的pH值条件有利于混晶二氧化钛溶胶的制备;由于混晶薄膜中,两种晶型TiO2的能带发生交迭,致使其光吸收边波长相对单一锐钛矿型TiO2薄膜发生红移,同时"混晶效应"使得该混晶薄膜具有了较高的光催化活性。By means of sol-gel method, TiO2 sol containing anatase-rutile mischcrystal grains was prepared at lower pH value, and the mischcrystal films were obtained from the resultant sol by a dip-coating technique. XRD, TEM and UV-Vis absorption spectrum were used to analyze the samples, and the photocatalytic activities of TiO2 films were also investigated. It was found that the low pH value is bcneficial to the formation ofanatase-rutile mischcrystal grains. As the energy band structure of anatase TiO2 and rutile TiO2 are different from each other, there is an overlapping band in the mischcrystal grains, and thus it results in the red shift of absorption edge of mischcrystal film. Because of the ＂mischcrystal effect＂, the photocatalytic activity of mischcrystal TiO2 film is increased compared with anatase TiO2 film.

关 键 词：锐钛矿 金红石 二氧化钛溶胶 混晶 光催化 

分 类 号：O643.36[理学—物理化学]