水量对锐钛矿溶胶制备、结构及光催化性能的影响  

Effect of Water Amount on the Preparation,Structure and Property of Anatase Sol

作　　者：高基伟[1] 杨辉[2] 

机构地区：[1]浙江大学材料系,浙江杭州310027 [2]浙江大学绿色建材及应用技术中心,浙江杭州310027

出　　处：《稀有金属材料与工程》2007年第A02期303-305,共3页Rare Metal Materials and Engineering

基　　金：浙江省科技计划项目资助(2005C24005)

摘　　要：选择"钛酸丁酯-水-乙醇-盐酸"的溶胶-凝胶反应体系,考察反应物水的用量变化对反应过程、溶胶结构和光催化性能的影响,并获得了含有锐钛矿晶体、具有光催化性能的氧化钛溶胶。钛酸丁酯与水的摩尔比为1:2、1:4、1:8时,会逐渐形成凝胶,溶胶常温干燥后的粉体呈无定型结构,透射电镜中只能观察到细小的成膜粒子,溶胶不能使罗丹明B溶液分解褪色。钛酸丁酯与水的摩尔比为1:40、1:100、1:200时,钛酸丁酯发生充分水解,有可能形成稳定的溶胶:溶胶常温干燥后的粉体呈锐钛矿晶型,且结晶强度随水的用量的增加而增强;透射电镜中可观察到松散的团聚体、初显正方形较为紧密的结晶体和致密规则的正方形锐钛矿晶体;各溶胶均可催化降解罗丹明B使其褪色。The effect of water amount on preparation, structure and property of the sol was examined by ＂Ti（OC4H9）4-H2O-C2HsOH-HCl＂ reaction system and sol-gel method, and anatase sol with photocatalytic property was obtained. When mol ratio of Ti（OC4Hg）4 to H2O are 1：2, 1：4 and 1：8, the sols finally become gels, and X-ray diffraction spectra show that powders obtained by drying the sol at 40℃ are amorphous pattern, and only fine particles in the sol can be observed by TEM. Therefore the sols cannot decompose Rhodamine B under UV light. When mol ratio of Ti（OC4Hg）4 to H2O are 1：40, 1：100 and 1：200, the samples possibly become stable sols, and X-ray diffraction spectra show that powders obtained by drying the sol at 40 ℃ are anatase pattern, also there are congeries, embryonic anatase crystals and fine anatase crystals in the sol separately by TEM, thus the sols can decompose Rhodamine B under UV light to make it fade into colorless.

关 键 词：氧化钛溶胶 锐钛矿晶体 光催化性能 

分 类 号：O643.3[理学—物理化学]