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分别以Ti(OBun)4和Pluronic F127为无机前驱体和模板剂,以硫脲为添加剂,采用sol-gel法结合蒸发致自组装法(EISA)制备了锐钛矿结构的介孔TiO2薄膜材料.采用SEM、XPS、N2吸附-脱吸、XRD和UV-Vis光谱对其进行了表征.研究发现,向前驱体溶液添加硫脲一方面改变了TiO2的介孔结构,另一方面对介孔TiO2进行了N、S共掺杂.当溶液中硫脲与Ti(OBun)4的摩尔比为2.5%时,介孔TiO2的孔径由未掺杂的7.0nm增至12.4nm,光催化降解甲基橙实验表明其在紫外光区具有最优的光催化活性;当溶液中硫脲与Ti(OBun)4的摩尔比为5%时,其吸收边由380nm扩展至520nm,光催化降解罗丹明B实验表明其在可见光下显示出最优的光催化活性.
The mesoporous TiO2 films with anatase structure were prepared by sol-gel method combined with evaporation-induced self-assembly (EISA) using Ti (OBun) 4 and Pluronic F127 as inorganic precursors and templating agents with thiourea as additive .It was characterized by SEM, XPS, N2 adsorption-desorption, XRD and UV-Vis spectroscopy.It was found that the addition of thiourea to the precursor solution changed the mesoporous structure of TiO2 on the one hand, TiO2 was co-doped with N and S. When the molar ratio of thiourea to Ti (OBun) 4 in the solution was 2.5%, the pore size of mesoporous TiO2 increased from 7.0nm to 12.4nm without undoped, The experimental results of base orange show that it has the best photocatalytic activity in the UV region. When the molar ratio of thiourea and Ti (OBun) 4 in the solution is 5%, the absorption edge extends from 380 nm to 520 nm, photocatalytically degrading Rhodamine B experiments show that it shows the best photocatalytic activity in visible light.