锐钛矿TiO_2溶胶的光催化反应动力学  

Kinetics Analysis on Photocatalytic Reaction of Anatase TiO_2 Sol

作　　者：杨辉[1,2] 申乾宏[1] 高基伟[1,2] 蔡振钱[1] 宁海水[1] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027 [2]浙江大学绿色建材及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51-54,共4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：采用溶胶-凝胶法制备了具有光催化性能的锐钛矿型TiO2溶胶,并研究了溶胶光催化罗丹明B的反应动力学,发现溶胶的光催化反应过程可分为两个阶段:第一阶段为速度较慢的打散罗丹明B分子聚集体的一级反应,第二阶段为速度较快的破坏罗丹明B分子结构的复杂反应。溶胶中锐钛矿晶体的量子效应、比表面积和布朗运动,导致光催化反应体系中同时存在多个不同反应进程的分反应及其后续反应,因此溶胶光催化反应过程较为复杂,可用Boltzmann公式进行数学拟合;而常见的粉体和薄膜的光催化反应过程大多较简单,为零级或一级反应。An anatase TiO2 sol with photocatalytic activity, prepared by sol-gel method, was used to decompose Rhodamine B solution. The kinetics analysis of the reaction course was carried out. It is found that the reaction of sol photocatalysis can be divided into two steps： firstly slow first-order reaction of breaking up the congeries of Rhodamine B molecules, and the following fast complex reaction of breaking up the bonds inside Rhodamine B molecules. The quantum effect, huge surface and the Brown activities of the anatase crystals in the TiO2 sol make the photocatalytic reaction of anatase TiO2 sols much more complex than those of powder＇s and film＇s. There are lots of sub-reactions and their following ones occurring at the same time and all of them together make the whole reaction course be simulated by Boltzmann simulation. While most reaction course of powders and films can simply be simulated by zero-order or first-order simulation.

关 键 词：锐钛矿溶胶 光催化动力学 Boltzmann拟合 溶胶-凝胶 

分 类 号：O643.3[理学—物理化学]