摘要
在催化剂制备过程中分别采用阴离子型、非离子型和阳离子型表面活性剂对CuO/TiO2进行修饰。采用XRD、BET、UV-Vis、FTIR、三维荧光和SEM对催化剂进行表征,发现表面活性剂的加入和类型变化不对催化剂的晶型和紫外可见吸收特性产生影响,催化剂中均有CuO和锐钛矿TiO22种晶体,催化剂吸收阈均达900 nm。但表面活性剂类型会影响催化剂表面有机基团量、催化剂内氧空位量和催化剂的粒径大小。加入阴离子型表面活性剂后,得到的催化剂表面有机基团和氧空位量最丰富,粒径最小,具有最高的光催化活性;加入阳离子型表面活性剂后,得到的催化剂的活性最差。当用十二烷基硫酸钠为改性剂催化降解邻苯二甲酸二丁酯时,2 h内邻苯二甲酸二丁酯降解率达到93%。
CuO/TiO2 is modified by anionic,nonionic and cationic surfactant respectively in the preparation process.XRD,BET,UV-Vis,FTIR,3D fluorescence and SEM are used to characterize the structure and photocatalytic activity of catalysts,which shows that crystal and UV-visible absorption characteristics of photocatalysts do not change with surfactant modification.All photocatalysts contain anatase TiO2 and CuO crystal,and their UV-visible absorption edges reach 900 nm.Whilse different kinds of surfactant lead to different amount of organic groups in photocatalytic surface,oxygen vacancies and the particle size of photocatalysts.Photocatalyst modified by anionic surfactant has the highest photocatalytic activity,because it has the richest organic groups and oxygen vacancies,and its particle size is the smallest.In contrast,photocatalyst modified by cationic surfactant has the lowest photocatalytic activity.In addition,degradation of dibutyl phthalate photocatalyzed by sodium dodecyl sulfate modified photocatalysts reaches at 93%.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第1期129-134,共6页
Journal of Civil,Architectural & Environment Engineering
基金
教育部博士点基金资助项目(20070611009)
教育部科技创新工程重大项目培育项目(708071)
