以正硅酸乙酯、钛酸异丙酯为前驱体, 尿素为沉淀剂, 改进的均匀沉淀法制备了TiO2-SiO2介孔复合材料, 用XRD、FTIR、氮气吸附-脱附、XPS等对材料进行了表征. 结果表明: Ti/Si摩尔比为0.5的介孔复合材料平均孔径为3.2nm, 比表面积达到609m2/g. 用光还原法在材料表面沉积适量的贵金属Pt, 大大提高了材料的光催化活性.
Titania-silica mesoporous materials were synthesized by the improved homogeneous precipitation method with tetraethyl silicate and titanium isopropoxide as precursors and CTAB as the structure-directing agent. The materials were characterized by XRD, FT-IR, XPS, nitrogen sorption and so on. The mesoporous composite with Ti/Si molar ratio of 1/2 shows a narrow distributing pore diameter and large special surface area of 609m2/g. Compared with pure nano-TiO2 particles at the same titania loading, the composite exhibits higher photocatalytic activity in the degradation of methyl orange. The
photocatalytic activity is greatly improved by doping platinum with an ppropriate loading.
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