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

Abstract

Abstract: Nanosized Pd clusters deposited on titania modified MCM-41 was synthesized by photodeposition method through PdCl₄^2- 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 PdCl₄^2- 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

CLC Number:

O611.4

TrendMD:

ZHENG Shan, GAO Lian, GUO Jing-Kun . Synthesis, Structure Characterization and Photoactivities of Nanosized Pd Clusters on Titania-modified MCM-41 by Photodeposition Method[J]. Chem. J. Chinese Universities, 2002, 23(6): 1126.

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

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