【摘要】 以Lutensol TO(异构十三醇聚氧乙烯醚)系列非离子表面活性剂为辅助剂,采用溶胶-凝胶法制备了比表面积高、孔径分布窄的锐钛矿型TiO2多孔微球,并用透射电镜、扫描电镜、热重-差热分析、X射线衍射和氮吸附进行了表征.以亚甲基蓝降解为模型反应评价了其光催化性能,并与商品化TiO2Degussa P25进行了比较.实验结果表明,样品在425℃焙烧后,形成具有孔状结构的锐钛矿型TiO2微球,粒径为0.7~1.0μm,比表面积为70.5 m2/g,总孔容为0.12 cm3/g,平均孔径为4.26nm,晶粒尺寸为12 nm.这种多孔TiO2微球具有较高的催化活性,与Degussa P25纳米TiO2的催化活性相当.更多还原

【Abstract】 Nanocrystal and porous TiO2 microbeads with high surface area and narrow pore size distribution were prepared by sol-gel technique in the presence of Lutensol TO series(iso-tridecanol) polyoxyethylene ether nonionic surfactants.The resultant TiO2 microbeads were characterized by TEM,SEM,TG-DSC,XRD,and N2 adsorption.The photocatalytic performance of TiO2 microbeads was evaluated through degradation of methylene blue and compared with the commercial Degussa P25 nano-TiO2.The results showed that at optimal treatment temperature of 425 ℃,anatase-type TiO2 microbeads with particle size of 0.7-1.0 μm were obtained.The microbeads have porous structure with a BET specific surface area of 70.5 m2/g,total pore volume of 0.12 cm3/g,average pore diameter of 4.26 nm,and crystal size of 12 nm.The TiO2 microbeads exhibited similar photocatalytic activity to Degussa P25 for the degradation of methylene blue.更多还原