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WO3/TiO2纳米材料的制备及光催化性能
引用本文:李芳柏,古国榜,李新军,万洪富.WO3/TiO2纳米材料的制备及光催化性能[J].物理化学学报,2000,16(11):997-1002.
作者姓名:李芳柏  古国榜  李新军  万洪富
作者单位:Guangdong Institute of Eco-Environment and Soil Science,Leyiju,Guangzhou 510650,College of Chemical engineering,South China University of Technology,Wushan,Guangzhou 510642
摘    要:采用溶胶-凝胶法制备WO3/TiO2复合纳米光催化剂,掺入WO3、TiO2锐钛矿101峰的相对强度、平均晶粒直径与颗粒直径均减小,比表面积增大;WO3掺入摩尔比分别为2%、5%、8%时,新的LRS峰位分别出现在797、967及969cm-1;在380-460nm范围内,WO3/TiO2的反射率减小,XPS分析表明,WO3/TiO2晶体中存在W6+、W5+、W4+、和Ti4+、Ti3+。以亚甲基兰的光催化降解为反应模型,掺入WO3后,光催化活性增强,掺入摩尔比为2%时,WO3/TiO2的光催化活性最高。还讨论了光催化活性与性质的关系。

关 键 词:光催化  二氧化钛  三氧化钨  复合半导体  亚甲基兰  
收稿时间:2000-02-29
修稿时间:2000-05-30

Preparation,Characterization and Photo catalytic Behavior of WO3/TiO2 Nanopowder
Li Fangbai,Gu Guobang,Li Xinjun,Wan Hongfu.Preparation,Characterization and Photo catalytic Behavior of WO3/TiO2 Nanopowder[J].Acta Physico-Chimica Sinica,2000,16(11):997-1002.
Authors:Li Fangbai  Gu Guobang  Li Xinjun  Wan Hongfu
Institution:Guangdong Institute of Eco-Environment and Soil Science,Leyiju,Guangzhou 510650|College of Chemical engineering,South China University of Technology,Wushan,Guangzhou 510642
Abstract:WO3/TiO2 samples were prepared by sol-gel process and characterized by means of XRD、LRS、TEM、DRS、BET、XPS.It has been shown that the mean crystal diameter and mean particle diameter of WO3/TiO2 samples decreased while the percent of anatase and specific surface area increased owing to the doping of WO3.New LRS peaks presented at 797,967 and 969cm-1,respectively,when the concentration of doped WO3 was 2%,5%and 8%.The reflectance percentate of WO3/TiO2 samples was less than that of pure TiO2 in the range of 380-460nm.The XPS fitting analyses showed that there were W6+、W5+、W4+ and Ti4+、Ti3+ in the lattice of WO3/TiO2.Being a model reaction,the photo-catalytic degradation of methylene blue was investigated in TiO2 and WO3/TiO2 nanopowder suspension irradiated by high-pressure mercury lamp.As a result,the addition of WO3 to TiO2 greatly enhanced its photo-catalytic behavior,and the optimum concentration of WO3 in TiO2 was 2%(molar percent).Moreover,the relationship between photo-activity and the physical and chemical properties of the samples have been discussed.
Keywords:Photo-catalysis  Titanium dioxide  Tungsten oxide  Coupled semiconductor  Methylene blue
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