光沉积法合成纳米金属Pd负载的MCM-TiO_2及其光催化性质研究  

Synthesis, Structure Characterization and Photoactivities of Nanosized Pd Clusters on Titania-modified MCM-41 by Photodeposition Method

作　　者：郑珊[1] 高濂[1] 郭景坤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能结构陶瓷与超微结构国家重点实验室,上海200050

出　　处：《高等学校化学学报》2002年第6期1126-1130,共5页Chemical Journal of Chinese Universities

基　　金：国家重点基础研究发展规划项目 (G19990 64 5 0 6)资助

摘　　要：用光沉积方法由 Pd Cl2 - 4和 Ti修饰的 MCM-41合成了纳米钯团簇 Pd/MCM-Ti O2 ,用 XPS,N2 吸脱附等温线 ,UV-Vis和 Raman光谱对其结构进行了表征 .将该团簇用于苯酚的光降解和 Cr( )还原为Cr( )的反应中 。Nanosized Pd clusters deposited on titania modified MCM 41 was synthesized by photodeposition method through PdCl 2- 4 and titania modified MCM 41. The structure and optical properties of the as synthesized samples were investigated by XPS, N 2 adsorption/desorption isotherms, diffuse reflectance UV Vis absorbance spectroscopy and Raman spectroscopy. Metallic palladium was efficiently photoreduced on the surface of titania in the mesopore from PdCl 2- 4 according to the results of XPS. The adsorption revealed that titania and noble Pd clusters were uniformly distributed on the silica wall surfaces of MCM 41 support. The configuration of partial titania in Pd deposited titania modified MCM 41 changed from tetrahedral to octahedral from the results of adsorption in UV Vis spectra and Raman spectra because of the interactions between the loaded Pd clusters and titania. The Pd deposited titania modified MCM 41 exhibited a high photocatalytic activity for the photodegradation of phenol and the photoreduction of Cr(Ⅵ) to Cr(Ⅲ).

关 键 词：光催化性质 光沉积法 光催化剂 钠米金属钯 分子筛 二氧化钛 负载型催化剂 苯酚 光降解 

分 类 号：O643.361[理学—物理化学] O625.312[理学—化学]