FABRICATION AND CHARACTERIZATIONS OF MESOPOROUS TiO_2AND SiO_2/TiO_2 COMPOSITE WITH HIGH PHOTOCATALYTIC ACTIVITYUSING A NEW GEMINI SURFACTANT

摘要

In this paper, mesoporous rod-like SiO_2/TiO_2 (m-SiO_2/TiO_2) and mesoporous sphere-like TiO_2 (m-TiO_2) have been prepared by using a new type Gemini surfactant containing carbonyl groups (GSA, [(C_nH_(2n+1))(CH_3)_2N~+(CH_2)_2-O_2C-(CH_2)_4-CO_2-(CH_2)_2N~+(CH_3)_2(C_nH_(2n + 1))] 2Br , n = 12) as template at pH — 6 at room temperature. The products are characterized by Fourier transform infrared spectroscopy (FT—I R), scanning electron microscopy (SEM), X-ray diffraction (XRD), and N_2 adsorption—desorption. The results indicate that anatase TiO_2 exists in both samples and m-SiO_2/TiO_2 has a higher surface area (741.13 m~2/g) than m-TiO_2. Moreover, as-synthesized samples show excellent photocatalytic activity for the degradation of methyl red under UV irradiation.