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Study of adsorption-assisted photocatalytic oxidation of benzene with TiO2/SiO2 nanocomposites

Paper ID Volume ID Publish Year Pages File Format Full-Text
40559 45858 2013 7 PDF Available
Title
Study of adsorption-assisted photocatalytic oxidation of benzene with TiO2/SiO2 nanocomposites
Abstract

TiO2/SiO2 composite photocatalysts were prepared via a simple reflux-stir process. These composites exhibit a highly distributed state between TiO2 (P25) and fumed silica (SiO2) nanoparticles, and the SiO2 nanoparticles surround the TiO2 crystalline grains closely. The photoactivity of the composites was investigated by photocatalytic oxidation of gaseous benzene. By adjusting the Ti/Si mole ratio from 50:1 to 1:1, the photocatalytic efficiency of the TiO2/SiO2 composites ascends firstly and then decreases. The optimum Ti/Si mole ratio is 30:1, and the photocatalytic efficiency reaches 92.3% within 120 min, which is 6.8 times higher than that of P25. Additionally, recycled tests which performed ten times demonstrate the nanocomposites possess a pretty good recyclability. The excellent photocatalytic performances can be chiefly attributed to the good dispersion state between TiO2 and SiO2. The special structure helps the formation of a high population of hydroxyl groups on the catalysts surface, and these hydroxyl groups greatly improve the charge separation efficiency and the reaction rate. In addition, the enhanced adsorption powers to water vapor and benzene also contribute to the high photoactivity.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (327 K)Download as PowerPoint slideHighlights► Highly distributed TiO2/SiO2 composites were prepared via a simple reflux-stir process. ► The composites show superior photocatalytic oxidation efficiency and recyclability. ► Different Ti/Si molar ratios of TiO2/SiO2 influence the photocatalytic activity greatly. ► Enhanced adsorptive power to water vapor and benzene accelerate the reaction rate. ► A high population of surface hydroxyl groups leads to the notable photoactivity.

Keywords
TiO2; SiO2; Adsorption; Benzene; Hydroxyl radicals
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 451, 31 January 2013, Pages 120–126
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us