Cu/V_2O_5-TiO_2的结构、光吸收性能与催化反应性能研究  

Structure,photo absorption performance and catalytic properties on Cu/V_2O_5-TiO_2

作　　者：梅长松[1] 钟顺和[1] 肖秀芬[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《功能材料》2005年第2期256-259,共4页Journal of Functional Materials

基　　金：国家重大基础前期研究专项资助项目(2001CCA03600)

摘　　要：用溶胶 凝胶法制得复合半导体 V2O5 TiO2,用等体积浸渍法制得Cu/V2O5 TiO2 光催化剂。利用X射线衍射(XRD)、拉曼光谱(Raman)、程序升温还原(TPR)、红外光谱(IR)、X 射线光电子能谱(XPS)、紫外可见漫反射光谱(UV VisDRS)和光反应器等技术研究了 Cu/V2O5 TiO2 的物相结构、光吸收性能和光催化反应性能。结果表明:含量为 10%(质量分数)的V2O5 单分子层分散在 TiO2 表面;V2O5 负载量超过单分子层分散(> 10% (质量分数))有晶相V2O5 生成,光吸收性能下降;负载金属 Cu 促进四面体配位V向八面体配位 V转化,使 TiO2 光吸收限发生蓝移,对可见光部分的吸收明显增加,拓宽了催化剂的光响应范围,提高了材料的光催化性能, CO2 和C3H6 合成MAA反应的光量子效率显著增加;催化剂的光吸收性能与反应性能呈顺变关系,Cu/10%V2O5 TiO2 的催化活性优于其它含量的催化剂,光量子效率达到15.5%。The solid material of coupled semiconductors V2O5-TiO2, was prepared by sol-gel method. The photocatalyst V2O5-TiO2 supported metal Cu was prepared by an isovolumic impregnation method. The surface structure, particle size and photo absorption performance of the materials were characterized by XRD, Raman, TPR, IR, XPS, UV-Vis DRS and photoreactor techniques. The experiment results showed that 10 wt% V2O5 has dispersed on the surface of TiO2 support with one monolayer of non-crystalline phase; The crystal V2O5 forms and photo absorption performance decreased when supporting amount of V2O5 was more than the monolayer phase (>10 wt%); The formation of bond V-O-Ti in the solid system promotes transference of generating charge carriers between V2O5 and TiO2; Loaded metallic Cu accelerats transformation from the tetrahedrally coordinated V species to the octahedrally coordinated V species; Both blue shifting of photo absorption edge and increasing of the photo absorption capacity to visible light were observed clearly after the addition of metal on the surface of V2O5-TiO2 result in increasing of photo quantum efficiency of reaction for the synthesis of MAA from CO2 and C3H6; The change of the photo quantum efficiency corresponds with the change of the photo absorption performance on Cu/V2O5-TiO2; Photo-quantum efficiency of the reaction was most among the others on Cu/10%V2O5-TiO2, which reaches 15.5%.

关 键 词：复合半导体 光催化剂 材料结构 光吸收性能 

分 类 号：O643[理学—物理化学]