宏观尺寸大孔-介孔TiO2/SiO2光催化剂的制备及其在染料降解中的应用

《复合材料学报》优先在线发表论文。

摘  要：以柱撑式环氧树脂大孔聚合物为模板，制备宏观尺寸的大孔-介孔SiO2；以其为载体，通过钛酸四丁酯原位水解和高温焙烧制得大孔-介孔TiO2纳米晶/SiO2复合材料。应用SEM、TEM、XRD、FTIR和N2吸附-脱附法对材料进行表征。以偶氮荧光桃红为模拟污染物，用氙灯模拟日光光源，考察了不同条件下大孔-介孔TiO2/SiO2的光催化性能。结果表明，大孔-介孔SiO2具有三维连续贯通的大孔孔道，孔壁为连续的纳米SiO2薄膜；TiO2纳米晶以纳米薄膜的形式均匀地原位生长在SiO2纳米薄膜的两侧，得到的复合材料孔壁上存在丰富的介孔。当焙烧温度为600℃、TiO2的负载量为15.7 wt%、染料溶液浓度为10 mg·L-1且pH为3时，大孔-介孔TiO2/SiO2光催化剂对污染物的光催化降解效率最高，而且具有良好的重复使用性。

关键词：宏观尺寸；大孔-介孔；SiO2；纳米TiO2；光催化

Abstract: A macro-sized macro-mesoporous SiO2 was prepared by using a pillared epoxy resin macroporous polymer as template and it was used as support to prepare macro-mesoporous TiO2-nanocrystalline /SiO2 composite through an in situ hydrolysis of tetrabutyl titanate and a subsequent calcination at high temperature. The macro-mesoporous TiO2/SiO2 samples were characterized by SEM, TEM, XRD, FTIR and N2 adsorption-desorption. Using azophloxine as a simulated pollutant, the photocatalytic activity of the macro-mesoporous TiO2/SiO2 was studied under the sunlight irradiation simulated by Xenon lamp under different conditions. The results show that the macro-mesoporous SiO2 has 3D continuous pass-through macropore structure and its pore wall is continuous silica nano-film. TiO2-nanocrystallines, in the form of nano-film, in situ grow uniformly on both sides of the nano SiO2 film, and abundant mesopores are observed on the pore wall of the obtained macro-mesoporous TiO2/SiO2 composite. The macro-mesoporous TiO2/SiO2 photocatalyst exhibits the best activity for photocatalytic degradation of pollutant from the macro-mesoporous TiO2/SiO2 composite containing 15.7 wt% of TiO2 calcined at 600℃, under the conditions of azophloxine concentration 10 mg·L-1 and pH of 3. The macro-mesoporous TiO2/SiO2 photocatalyst also has good reusability.

Keywords: macro-sized; macro-mesoporous; SiO2; nano TiO2; photocatalysis

作者：俞丽萍等，新型功能材料及其制备科学国家重点实验室培育基地，宁波大学材料科学与化学工程学院，宁波

通讯作者：梁云霄，新型功能材料及其制备科学国家重点实验室培育基地，宁波大学材料科学与化学工程学院，宁波

全文详见中国知网学术期刊优先数字出版。