Structure and Photocatalytic Activity of Silicon Doped TiO2 Photocatalysts Under Visible Light

doi:10.7517/j.issn.1674-0475.2013.04.006

Abstract

Abstract:

TiO₂ photocatalysts (TiO₂-xSi) doped by different contents of silicon were prepared by a sol-gel method. The catalysts exhibited a higher photocatalytic ability than the pure TiO₂ and N-doped TiO₂(TiO₂-N). The samples were characterized by XRD, XPS, FT-IR and UV-Vis diffuse reflectance absorption spectra. It was revealed that the doped silicon ions formed Si—O—Ti structures on the surface of TiO₂ particles. And thus, surface state energy attributed to the silicon dopant was located at 0.2—0.6 eV below the conduction band of TiO₂, which enhanced the response to the visible light and photocatalytic ability. It was discussed the suppression to the formation of rutile phase and the growth of titanium dioxide crystals because of the doped silica in TiO₂ particles and the effect of catalysts' surface area and surface species such as hydroxyl to the photocatalytic activity.

Key words: TiO₂, Si doping, visible light response, visible light photocatalytic

CLC Number:

ZHANG Peng, YU Yan-long, KUANG Yuan-jiang, YAO Jiang-hong, CAO Ya-an. Structure and Photocatalytic Activity of Silicon Doped TiO₂ Photocatalysts Under Visible Light[J]. Imaging Science and Photochemistry, 2013, 31(4): 295-304.

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Structure and Photocatalytic Activity of Silicon Doped TiO₂ Photocatalysts Under Visible Light

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