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A comparative study of different porous amorphous silica minerals supported TiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40446 45854 2013 8 PDF Available
Title
A comparative study of different porous amorphous silica minerals supported TiO2 catalysts
Abstract

•We have prepared three amorphous silica minerals as supports for TiO2 catalysis.•We characterized by XRD, SEM, FT-IR, TEM and XPS.•We investigated the UV-assisted degradation of Rhodamine B (RhB).•TiO2/DE photocatalyst exhibits better catalytic performance at different calcined temperatures.

Three porous amorphous silica minerals, including diatomite, opal and porous precipitated SiO2 were adopted to prepare supported TiO2 catalysts by hydrolysis–deposition method. The prepared compound materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Through morphology and physical chemistry properties of the resulting TiO2/amorphous SiO2 catalysts, it was proposed that the nature of silica supports could affect the particle size and the crystal form of TiO2 and then further influence the photocatalytic property of TiO2/amorphous SiO2 catalysts. The catalytic properties of these porous amorphous silica supported photocatalysts (TiO2/SiO2) were investigated by UV-assisted degradation of Rhodamine B (RhB). Compared with pure TiO2 (P25) and the other two TiO2/amorphous SiO2 catalysts, TiO2/diatomite photocatalyst exhibits better catalytic performance at different calcined temperatures, the decoloration rate of which can be up to over 85% even at a relatively low calcined temperature. The TiO2/diatomite photocatalyst possesses mixed-phase TiO2 with relatively smaller particles size, which might be responsible for higher photocatalytic activity. Moreover, the stable and much inerter porous microstructure of diatomite could be another key factor in improving its activity.

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Keywords
TiO2; Diatomite; Opal; Porous precipitated SiO2; Photocatalytic activity
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A comparative study of different porous amorphous silica minerals supported TiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 458, 10 May 2013, Pages 103–110
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us