溶胶浓度对锐钛矿TiO_2溶胶光催化反应的影响  

Effect of Sol Concentration on Photocatalytic Reaction of Anatase TiO_2 Sol

作　　者：杨辉[1,2] 宁海水[1] 高基伟[1,2] 方晨鹏[2] 

机构地区：[1]浙江大学材料科学与工程学系,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31-33,共3页Rare Metal Materials and Engineering

基　　金：国家科技支撑计划(2006BAJ05B05);浙江省科技计划(2005C24005)资助

摘　　要：以溶胶-凝胶工艺，钛酸丁酯、水、无水乙醇、盐酸摩尔比1：200：16：0．3的体系，制备出含有锐钛矿晶体、可光催化降解罗丹明B的氧化钛溶胶，并研究了溶胶浓度对降解罗丹明B的光催化反应的动力学影响。随锐钛矿溶胶浓度的降低，光催化反应速度变慢，反应的半衰期增大。降解罗丹明B的光催化反应可分为两个阶段；第二阶段历时约50～60min，为破坏罗丹明B分子结构的阶段，90％以上的罗丹明B分子在此阶段被降解；最终罗丹明B的降解率可达97％以上。An anatase sol, which contains anatase crystals, was prepared using Ti（OC4H9）4, H2O, C2H5OH and HCI reaction system with mol ratio of 1：200：16：0.3 by sol-gel method. The sol can decompose Rhodamine B solution, and the kinetics analysis of the reaction courses under different sol concentrations were carried out. It is showed that the reaction speed slows down while the half time increases with the decreasing of sol concentration in the photocatalytic reaction system. The photocatalysis course can be divided into two steps. The molecular of Rhodamine B is destroyed in the second step during which 90% Rhodamine B molecular is decomposed in this 50-60 minutes course. The decomposition ratio reaches beyond 97% finally.

关 键 词：锐钛矿溶胶 光催化反应 动力学 溶胶浓度 

分 类 号：O643.36[理学—物理化学]