中文摘要：

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-N，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Ti02，TiO，均匀分散于SBA-15表面，此外，COOH／SBA．15有效抑制了Ti02晶粒的长大．以光催化还原CO，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C02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．

英文摘要：

TiO2/SBA-15 catalysts, TiO2 nanoparticles well dispersed on SBA-15 supporter, have been successfully obtained through a self-assembly aging, carboxylation and subsequent solvothermal process. Firstly, P123 （PEG-PPG-PEG）, KC1, （2-cyanoethyl） triethoxysilane （CETES） and tetraethoxysilane （TEOS） were employed to form cyano-modified SBA-15 （CN/SBA-15） in 2.0 mol/L HC1 solution by self-assembly aging method. Secondly, carboxyl-modified SBA-15 （COOH/SBA-15） was got through carboxylation treatment in 48% H2SO4 solution at 95 ~C for 24 h. Finally, highly dispersed TiO2/SBA-15 catalysts were successfully synthesized via solvothermal method at 220 ~C for 12 h using COOH/SBA-15 and tetrabutyl titanate （TB） as raw materials. In order to remove the organic compounds and improve the crystallization of TiO2, the obtained TiO2/SBA-15 catalysts then were filtrated, washed by absolute ethanol for three times, dried at 80 ~C and cal- cined at 550 ~C for 4 h. Notably, the self-assembly and carboxylation process produced large number of good dispersive car- boxyl groups （COOH） on SBA-15, which could effectively anchored TB molecules on SBA-15 to promise the highly disper- sion Of TiO2 on SBA-15. The obtained TiO2/SBA-15 catalysts have been characterized by X-ray diffraction （XRD）, Raman spectrum, Fourier transform infrared spectroscopy （FT-IR）, transmission electron microscopy （TEM）, nitrogen adsorption and UV-Visible diffuse reflectance spectroscopy （UV-Vis）. Above results indicate that the TiO2/SBA-15 catalysts exhibit large specific surface area and TiO2 on SBA-15 supporter is anatase phase, they are both play important roles in photocata- lytic application. In the current manuscript, the photocatalytic reduction of CO2 under UV light irradiation as a prober reac- tion was used to investigate the photocatalytic performance of TiO2/SBA-15 catalysts. It was found that the obtained catalysts performed high photocatalytic capacity for CO2 reduction, especially when the loading amount of