摘要
采用溶胶 凝胶法制备复合半导体Y2 O3/TiO2 。掺入Y2 O3会阻碍锐钛矿晶相的出现 ,掺入浓度越大 ,TiO2 锐钛矿 (10 1)峰强度减小越大、平均晶粒直径与颗粒直径减小、比表面积增大 ;Y2 O3/TiO2 具有高热稳定性与高比表面积 ,由于量子尺寸效应 ,掺入Y2 O3使光催化剂的拉曼峰发生微小位移 ,在 3 80～ 460nm范围内 ,使反射率增强。以亚甲基蓝与甲基橙溶液光催化降解为模型反应 ,掺入Y2 O3,复合光催化剂对亚甲基蓝溶液的光催化脱色降解一级动力学常数明显低于纯TiO2 的 ;掺入 5 %和 10 %Y2 O3,复合光催化剂对甲基橙溶液的光催化脱色降解一级动力学均常数高于纯TiO2 的 ,掺入浓度太高反而有害。讨论了掺入Y2
Y 2O 3/TiO 2 samples were prepared by sol gel process and characterized by means of X ray diffraction (XRD), laser Raman spectra (LRS), UV visible diffuse reflectance spectra (DRS), specific surface area (BET), and transmission electron microscopy (TEM). The results show that the relative intensity of (101) peak of anatase and (002) peak of rutile, the mean crystal diameter and mean particle diameter of Y 2O 3/TiO 2 samples decrease while specific surface area increase owing to doping Y 2O 3. Y 2O 3/TiO 2 samples have a larger specific surface area and higher thermal stability. Owing to quantum size effect, the reflectance of Y 2O 3/TiO 2 samples is larger than that of pure TiO 2 in the range of 380～460 nm and the position of Raman peaks varies slightly. Being a model reaction, the photo catalytic degradation of methylene blue (MB) with positive charge and methyl orange (MO) with negative charge was investigated in TiO 2 and Y 2O 3/TiO 2 nanopowder suspension irradiated by high pressure mercury lamp. As a result, the addition of Y 2O 3 to TiO 2 is detrimental to photo activity of TiO 2 for MB photo degradation and photo catalytic behavior is enhanced due to 5% and 10% Y 2O 3 deposited on TiO 2 for the photo degradation of MO. The relationship between photo physical properties and photo activity was discussed.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第3期225-228,共4页
Journal of the Chinese Society of Rare Earths
基金
广东省农业环境综合治理基金项目
广东省环保局科技开发项目 !(2 0 0 0 0 6)
