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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 O3后光物理性质的变化与其光催化活性的关系
Preparation of Composite Semiconductor Y2 O3 / TiO2 by Sol - Gel Method. The incorporation of Y2 O3 hinders the appearance of anatase crystal phase. The larger the doping concentration is, the larger the peak intensity of TiO2 anatase (101) decreases, the average crystal grain diameter and particle diameter decrease and the specific surface area increases. Y2 O3 / TiO2 has high thermal stability and high specific surface area. Due to the quantum size effect, Y2 O3 incorporates a small shift in the Raman peak of the photocatalyst and increases the reflectivity in the range of 80-804 nm. The first-order kinetic constants of photocatalytic decolorization degradation of methylene blue solution with Y 2 O 3 and composite photocatalysts were significantly lower than that of pure TiO 2 with 5% and 10% Y 2 O3, photocatalytic degradation of methyl orange composite photocatalytic degradation of the first-order kinetics are higher than pure TiO2, the incorporation of too high but harmful. The relationship between the change of the photophysical properties and the photocatalytic activity after the incorporation of Y2 O3 was discussed