TiO_2/YFeO_3复合光催化剂的制备、表征及其对气相苯的降解(英文)  

Synthesis and Characterization of TiO_2/YFeO_3 and Its Photocatalytic Oxidation of Gaseous Benzene

作　　者：王唯诚[1] 李硕[1,2] 温怡芸[1] 龚茂初[1] 张磊[1] 姚艳玲[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,绿色化学与技术教育部重点实验室,成都610064 [2]烟台大学化学生物理工学院,山东烟台264005

出　　处：《物理化学学报》2008年第10期1761-1766,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20773090)资助项目

摘　　要：利用共沉淀法和柠檬酸法制备YFeO3,并以其为载体,将TiO2溶胶负载在其表面,制备了复合光催化剂TiO2/YFeO3.在紫外灯的照射下,考察对气相苯的降解效果并利用N2吸附、X射线衍射(XRD)、拉曼光谱、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、UV-Vis漫反射光谱等手段对催化剂进行了表征.结果表明,以共沉淀法制备的YFeO3为载体的复合催化剂,180min内苯的降解率达到44.7%,表现出更好的光催化活性.两种方法制备的YFeO3均为斜方晶相,TiO2分散在载体的表面,并与YFeO3存在一定的相互作用;两种复合催化剂均具有较窄的带隙能.YFeO3 was prepared by coprecipitation method and citric acid method, and TiO2/YFeO3 heterosystem photocatalysts were synthesized by loading TiO2 sol on the surface of YFeOz via sol-gel method. Their photocatalytic activities were evaluated by the decomposition of gaseous benzene under UV light illumination. The prepared photocatalysts were characterized by nitrogen adsorption-desorption, X-ray diffraction （XRD）, Raman spectroscopy, Xray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and UV-Vis diffuse reflectance spectroscopy. Results revealed that the heterosystem photocatalysts prepared by coprecipitation method showed higher activity, and the maximum conversion of benzene could reach 44.7% within 180 min. The YFeO3 samples prepared from coprecipitation method and citric acid method were absolutely in orthorhombic phase. The deposited titania was dispersed on the surface of carrier and a certain interaction existed between TiO2 and YFeO3. The two heterosystem photocatatysts had narrow band-gap energies.

关 键 词：光催化 TIO2 YFeO3 共沉淀法 柠檬酸法 苯 

分 类 号：O643.36[理学—物理化学]