(1. 中国科学院 广州能源研究所，广州 510070；
2. 华南理工大学 应用化学系， 广州 510640；
3. 广东省农业环境与综合治理重点实验室，
广东省生态环境与土壤研究所， 广州 510650)
摘 要: 通玻璃表面制备出表面采用溶胶凝胶工艺在普掺铁与体相掺铁的SEM， XRD和AES等技术TiO2薄膜。运用研究了复合薄膜的表面特征。催化降解甲基橙溶液为 以光模型反应，性。 结果表明： 体相掺 表征薄膜的光催化活铁时，为0.12%；表面掺铁时， 薄膜的最佳n(Fe)/n(Ti)薄膜的最佳1.5%。表面掺铁薄膜的最佳光n(Fe)/n(Ti)为催化表观速率常数比体相掺铁的最佳值要高1.5倍。 并从载流子分离效率等方面进行了机理探讨。
关键字: 表面掺铁； 体相掺铁； 二氧化钛薄膜；光催化活性
（1. Guangzhou Institute of Energy Conversion，
Chinese Academy of Sciences，Guangzhou 510070， China；
2.Department of Applied Chemistry，South China University of Technology，
Guangzhou 510640， China；
3.Guangdong Institute of Eco-Environment andSoil Science，
Guangzhou 510650， China）
Abstract:Surface iron-doped and bulk iron-doped TiO2 composite thin films deposited on glass substrates were prepared by sol-gel technology. The properties of the films were investigated by means of SEM, XRD and AES. The photo-catalytic activity of films was investigated by using the model reaction of the photo-catalytic degradation of methyl orange. The results show that the optimal n(Fe)/n(Ti) of bulk iron-doped TiO2 thin films is 0.12%, while that of surface iron-doped TiO2 thin films is 1.5%. Moreover, the maximum first-order kinetic rate constant, k, of surface iron-doped TiO2 thin films is more 1.5 times than that of bulk iron-doped TiO2 thin films. The doping mechanisms were discussed based on the charge carriers separated efficiency theory.
Key words: surface iron-doped; bulk iron-doped; TiO2 composite film; photo-catalytic activity
