Preparation and Properties of Sulfur-Doped Visible-Light Response S-TiO2/SiO2 Photocatalyst

doi:10.3724/SP.J.1088.2012.11127

Abstract

Abstract: S-doped visible-light response S-TiO₂/SiO₂ photocatalyst samples were prepared by a hydrolysis-precipitation method. The photocatalytic activity was investigated by the degradation of phenol. The separability of S-TiO₂/SiO₂ was determined by sedimentation. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, X-ray diffraction, transmission electron microscopy, and N₂ adsorption-desorption were used for catalyst characterization. The results showed that cationic S⁶⁺ was incorporated into TiO₂ lattice and substituted part of Ti⁴⁺. S-TiO₂/SiO₂ with suitable S-doping exhibited higher activity under ultraviolet light, visible light, and solar irradiation. S-TiO₂/SiO₂ exhibited better decanting ability and less deactivation. Doped-S can form a new bond of Ti–O–S above the valence band of TiO₂ to extend the adsorption edge to 450–550 nm, and can increase amount of surface OH^– of TiO₂. The addition of SiO₂ can form a new bond of Ti–O–Si, beneficial to the high dispersion, and larger surface area of S-TiO₂/SiO₂.

Key words: titania, silica, sulfur-doping, visible light, photocatalysis

CHEN Xiao-Yun, LU Dong-Fang, LIN Shu-Fang. Preparation and Properties of Sulfur-Doped Visible-Light Response S-TiO₂/SiO₂ Photocatalyst[J]. Chinese Journal of Catalysis, 2012, 33(6): 993-999.

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Preparation and Properties of Sulfur-Doped Visible-Light Response S-TiO₂/SiO₂ Photocatalyst

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