溶胶-凝胶辅助水热双模板法制备球形介孔TiO_2  

Preparation of Mesoporous TiO_2 Spheres via Sol-Gel Assisted Hydrothermal Method Using Double Templates

作　　者：王殿平[1] 刘守新[1] 

机构地区：[1]东北林业大学生物质材料教育部重点实验室,黑龙江哈尔滨150040

出　　处：《催化学报》2012年第10期1681-1688,共8页

基　　金：国家科技支撑计划(2012BAD32B04);高等学校博士学科点专项科研基金(20100062110003);中央高校基本科研业务费专项基金(DL11EB01)~~

摘　　要：以聚乙二醇和共嵌段化合物F127为双模板剂,采用溶胶-凝胶辅助水热法制备了球形介孔TiO2(MS-TiO2).采用扫描电镜、透射电镜、X射线衍射、热重分析和低温N2吸附-脱附对样品进行了结构表征,并以苯酚为降解模型物在紫外光下对其活性进行了评价.结果表明,所得TiO2为球形介孔结构,孔径为6.5～12.6nm,比表面积最高可达106.9m2/g,孔体积0.21cm3/g,球形颗粒直径200～300nm,由粒径为15～20nm的小晶粒组成.随着焙烧温度的升高,TiO2的比表面积和孔体积减小,孔径增大.双模板剂的使用比单一模板剂更能形成稳定的立体网状球形胶束,并有效抑制TiO2前驱体的团聚,诱导其形成球形介孔结构.其中,在500oC下焙烧所制MS-TiO2样品表现最高的光催化活性,苯酚降解率达86.4%,为TiO2的1.3倍.Mesoporous TiO2（MS-TiO2） spheres were prepared by a sol-gel assisted hydrothermal method using double-surfactant（PEG and F127） as templates.Scanning electron microscopy,transmission electron microscopy,X-ray diffraction,thermal gravimetry,and N2 adsorption-desorption were used for catalyst structural characterization.Phenol was used as a model compound for photocatalytic activity test.The results showed that MS-TiO2 spheres with uniform diameter of 200-300 nm,which was composed by 15-20 nm of TiO2 crystals,can be obtained.Maximum specific surface area as high as 106.9 m2/g,together with pore diameter of 6.5-12.6 nm and pore volume of 0.21 cm3/g,can be achieved under the optimum conditions.With increasing calcination temperature,specific surface area and pore volume of MS-TiO2 decreased,and pore diameter enlarged.Double templates can form a more stable spherical micelle,inhibit the growth and particle aggregation of TiO2 precursor and promote its self-assembly into spherical structure.MS-TiO2 prepared at 500 °C exhibited the highest activity with the phenol degradation of 86.4%,which is about 1.3 times that of TiO2 without templates.

关 键 词：双模板剂 二氧化钛 介孔 球形 表面活性剂 苯酚 

分 类 号：O643.36[理学—物理化学]