Synthesis and photocatalytic activity of mesoporous SiO_2–TiO_2

摘要

Mesoporous SiO_2–TiO_2 was synthesized by the sol–gel method using Si(OC_2H_5)_4, Ti(OC_2H_5)_4, and stearyltrimethylammonium chloride. By using acetylacetone as the capping agent of Ti(OC_2H_5)_4, homogeneous SiO_2–iO_2composite was obtained. Spherical mesoporous SiO_2–TiO_2 was also synthesized by the sol–gel method using W/O emulsion under microwave irradiation. The specific surface area of these mesoporous SiO_2–TiO_2 materials decreased when the Ti/Si molar ratio was higher than 0.1, which indicated that Ti was homogeneously distributed in mesoporous SiO_2 matrix at Ti/Si≤0.1. The photocatalytic activity of mesoporous SiO_2–TiO_2 materials was investigated by the degradation of methyleneblue in water under UV light irradiation. Mesoporous SiO_2–TiO_2 was effective for the adsorption–decomposition of methylene-blue.