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Titania-containing mesoporous silica powders: Structural properties and photocatalytic activity towards isopropanol degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
26835 43981 2010 12 PDF Available
Title
Titania-containing mesoporous silica powders: Structural properties and photocatalytic activity towards isopropanol degradation
Abstract

Ordered (SBA-15) and disordered (KIL-2) mesoporous silica supports have been synthesized and used for incorporation of titania with different Ti/Si molar ratios (1/2, 1/1, 2/1) via sol–gel impregnation method. Titanium isopropoxide and aqueous titania sol prepared by low-temperature sol–gel processing were used as a source of titania. Characterization by powder X-ray diffraction (XRD), nitrogen sorption measurements, scanning electron microscopy (SEM) and UV–vis–NIR diffuse reflectance spectroscopy (DRS) has been carried out to investigate the chemical framework and morphology of powders. The photocatalytic degradation of isopropanol in the gaseous medium was selected as a probe reaction to test the photoactivity of powders and to verify the potential application of these materials for air remediation. It was found that the titania source, Ti/Si molar ratio and the type of silica support influenced the functional properties of the material, which were evaluated by adsorption capacity and photocatalytic activity in the gas–solid reactor. The adsorption capacity of isopropanol was the highest in the presence of the SBA-15-supported materials. The photoactivity results indicated that the powders which were prepared using SBA-15 as a silica support and a Ti/Si molar ratio of 1/1 were the most active towards isopropanol oxidation monitored in situ by FT-IR spectroscopy.

Keywords
Mesoporous silica; Photocatalyst; Titanium dioxide; Isopropanol
First Page Preview
Titania-containing mesoporous silica powders: Structural properties and photocatalytic activity towards isopropanol degradation
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 216, Issues 2–3, 15 December 2010, Pages 167–178
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering