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以羧基改性的SBA-15(COOH/SBA-15)和钛酸四丁酯(TB)为原料,利用COOH/SBA-15表面上高分散的大量羧基将TB锚定,通过溶剂热处理得到高分散负载型TiO2/SBA-15催化剂.产物经XRD,Raman,FT-IR,TEM,N2吸脱附和UV-Vis表征,结果显示:所制备的TiO2/SBA-15催化剂为比表面大、结晶度较高的锐钛矿TiO2,TiO2均匀分散于SBA-15表面,此外,COOH/SBA-15有效抑制了TiO2晶粒的长大.以光催化还原CO2为探针反应,考察了TiO2/SBA-15催化剂在紫外光照射下的光催化性能.结果表明:相比于后处理浸渍法制备的光催化剂,本文制备的TiO2/SBA-15催化剂表现出了高的光催化还原CO2活性,主要产物为甲醇,且TiO2最佳负载量为16.5%,并对相关反应机理做了探讨.
TB is anchored with a large amount of carboxyl groups highly dispersed on the surface of COOH / SBA-15 using carboxy-modified SBA-15 (COOH / SBA-15) and tetrabutyl titanate (TB) as raw materials, The catalysts were characterized by XRD, Raman, FT-IR, TEM, N2 adsorption-desorption and UV-Vis. The results showed that the prepared TiO2 / SBA-15 catalyst has the characteristics of large surface area, The higher anatase TiO2 and TiO2 were uniformly dispersed on the surface of SBA-15, and COOH / SBA-15 effectively inhibited the growth of TiO2 crystal.With photocatalytic reduction of CO2 as probe reaction, the photocatalytic degradation of TiO2 / SBA- 15 catalyst under ultraviolet light irradiation.The results showed that TiO2 / SBA-15 catalyst prepared in this paper exhibited high photocatalytic activity of CO2 compared with the photocatalyst prepared by the post-treatment impregnation method, and the main products were Methanol, and the optimal loading of TiO2 was 16.5%, and the related reaction mechanism was discussed.