李芳柏1, 3， 柳 松2，張 琦1
(1. 中國(guó)科學(xué)院 廣州能源研究所，廣州 510070；
2. 華南理工大學(xué) 應(yīng)用化學(xué)系， 廣州 510640；
3. 廣東省農(nóng)業(yè)環(huán)境與綜合治理重點(diǎn)實(shí)驗(yàn)室，
廣東省生態(tài)環(huán)境與土壤研究所， 廣州 510650)
摘 要: 通玻璃表面制備出表面采用溶膠凝膠工藝在普摻鐵與體相摻鐵的SEM， XRD和AES等技術(shù)TiO2薄膜。運(yùn)用研究了復(fù)合薄膜的表面特征。催化降解甲基橙溶液為 以光模型反應(yīng)，性。 結(jié)果表明： 體相摻 表征薄膜的光催化活鐵時(shí)，為0.12%；表面摻鐵時(shí)， 薄膜的最佳n(Fe)/n(Ti)薄膜的最佳1.5%。表面摻鐵薄膜的最佳光n(Fe)/n(Ti)為催化表觀速率常數(shù)比體相摻鐵的最佳值要高1.5倍。 并從載流子分離效率等方面進(jìn)行了機(jī)理探討。
關(guān)鍵字: 表面摻鐵； 體相摻鐵； 二氧化鈦薄膜；光催化活性
LI Fang-bai1, 3，LIU Song2， ZHANG Qi1
（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
