高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (6): 1126.

• 研究论文 • 上一篇    下一篇

光沉积法合成纳米金属Pd负载的MCM-TiO2及其光催化性质研究

郑珊, 高濂, 郭景坤   

  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
  • 收稿日期:2001-04-23 出版日期:2002-06-24 发布日期:2002-06-24
  • 通讯作者: 高　濂(1945年出生),男,博士,研究员,从事纳米材料和高温结构陶瓷研究.E-mail:liangaoc@online.sh.cn E-mail:liangaoc@online.sh.cn
  • 基金资助:

    国家重点基础研究发展规划项目(G1999064506)资助

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

ZHENG Shan, GAO Lian, GUO Jing-Kun   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2001-04-23 Online:2002-06-24 Published:2002-06-24

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摘要： 用光沉积方法由PdCl42-和Ti修饰的MCM-41合成了纳米钯团簇Pd/MCM-TiO2,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(Ⅵ)还原为Cr(Ⅲ)的反应中,表现出较高的光催化活性.

关键词: Pd团簇, MCM-TiO2, Pd/MCM-41-TiO2, 光沉积法, 光催化剂

Abstract: Nanosized Pd clusters deposited on titania modified MCM-41 was synthesized by photodeposition method through PdCl42- and titania modified MCM-41. The structure and optical properties of the as synthesized samples were investigated by XPS, N2 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 PdCl42- 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).

Key words: Pd clusters, Titania-modified MCM-41, Pd deposited titania modified MCM-41, Photodeposition, Photocatalyst

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