Preparation and Photocatalytic Activities with Different Modes of Three-dimensionally Ordered Macroporous Composite Ag/TiO2

doi:10.7503/cjcu20121175

Abstract

Abstract:

Using polystyrene(PS) latex sphere and triblock copolymer surfactant EO₂₀PO₇₀EO₂₀(P123) as templates, three-dimensionally ordered macroporous(3DOM) composite Ag/TiO₂ was prepared by the sol-gel method and calcination. The phase compositions, structures and morphologies of 3DOM Ag/TiO₂ were well-characterized by Fourier transform infrared(FTIR) spectra, X-ray diffraction(XRD), UV-Vis diffuse reflectance spectra(UV-Vis/DRS), X-ray photoelectron spectra(XPS), N₂ adsorption-desorption tests and scanning electron microscopy assisted X-ray energy dispersive spectroscopy(SEM-EDS). The results show that the pore structure of Ag/TiO₂ composite is distributed neat and orderly, whose wall is mesoporous, moreover, the composite belongs to three-dimensional ordered macroporous material. The 3DOM Ag/TiO₂ has anatase crystalline structure, in which Ag is metallic Ag⁰. Compared with Degussa P25, the absorption band of 3DOM Ag/TiO₂ is red-shifted ca. 30 nm to the visible region. For photocatalytic degradation of organic pollutants with different modes, including UV, visible light and mircomave-assisted irradiation, 3DOM Ag/TiO₂ shows better activities than Degussa P25 and Ag/TiO₂. In addition, 3DOM Ag/TiO₂ exhibits superior photocatalytic activity in the degradation process of different type organic pollutans.

Key words: Three-dimensionally ordered macroporous(3DOM), Ag/TiO₂, Photocatalysis, Organic pollutant

CLC Number:

O643.36

TrendMD:

LU Lu, LI Li, HUANG Xian-Dan, LI Zhao, ZHANG Xiu-Li, WANG Li-Li. Preparation and Photocatalytic Activities with Different Modes of Three-dimensionally Ordered Macroporous Composite Ag/TiO₂[J]. Chem. J. Chinese Universities, 2013, 34(9): 2202.

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Preparation and Photocatalytic Activities with Different Modes of Three-dimensionally Ordered Macroporous Composite Ag/TiO₂

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