Citation: GAO Shan-Min, LIU Xin, XU Hui, LIU Xun-Yong, HUANG Bai-Biao, DAI Ying. SiO2/TiO2-xCx/C: Preparation, Characterization, Adsorption and Visible-Light Photocatalytic Properties[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(3): 557-564. doi: 10.3969/j.issn.1001-4861.2013.00.120
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We report an architecturally controlled synthesis of porous SiO2/TiO2-xCx/C composites with high adsorption capability and efficient visible-light photocatalytic activity. The porous composites are composed of silica particles as the cores and tetrabutyl titanate as the precursor for the TiO2 shell. Ethylene glycol, glycerol, glucose and polyvinyl alcohol were used as the binding agent between the core and the precursory shell, the carbon source and the porosity promoter, respectively. The structure, crystallinity, morphology, and other physical-chemical properties of the samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microcopy (HRTEM), X-ray photoelectron spectroscopy (XPS), fourier transform-infrared spectroscopy (FTIR), N2 adsorption-desorption isotherms measurements and UVVis diffuse reflectance spectroscopy (DRS). The formation mechanism of the porous composites was discussed. Methylene blue solution(MB) was used as model wastewater to evaluate the adsorption and photocatalytic activity of the samples under visible light. The as-synthesized porous composites exhibit both much higher adsorption capability and better photocatalytic activity for the photooxidation of MB than that of the pure silica-titania composite. The adsorption rate reaches 70% within 30 min when polyvinyl alcohol is used as the carbon source, and the sample using glycerol as the carbon source has the best visible- light photocatalytic activity and the degradation rate of MB can be 95% within 40 min.
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