Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4
Duangdao Channei1,2, Auppatham Nakaruk3,4, Wilawan Khanitchaidecha4,5
1Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok, Thailand.
Abstract:
The silicon dioxide (SiO2)-coated bismuth vanadate (BiVO4) composites as visible-driven-photocatalysts were successfully synthesized by the co-precipitation method. The effects of SiO2 coating on the structure, optical property, morphology and surface properties of the composites were investigated by X-ray diffraction (XRD), UV-visible diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM) and Brunauer-Emmette-Teller (BET) measurements. The photocatalytic activity of monoclinic BiVO4 and BiVO4/SiO2 composites were evaluated according to the degradation of methylene blue (MB) dye aqueous solution under visible light irradiation. The SiO2-coated BiVO4 composites showed the enhancing photocatalytic activity approximately threefold in comparison with the single phase BiVO4.
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