物理化学学报 >> 2008, Vol. 24 >> Issue (10): 1761-1766.doi: 10.1016/S1872-1508(08)60072-8

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TiO2/YFeO3复合光催化剂的制备、表征及其对气相苯的降解

王唯诚, 李硕, 温怡芸, 龚茂初, 张磊, 姚艳玲, 陈耀强   

  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; 烟台大学化学生物理工学院, 山东 烟台 264005
  • 收稿日期:2008-05-26 修回日期:2008-06-16 发布日期:2008-10-08
  • 通讯作者: 陈耀强 E-mail:nic7501@email.scu.edu.cn

Synthesis and Characterization of TiO2/YFeO3 and Its Photocatalytic Oxidation of Gaseous Benzene

WANG Wei-Cheng, LI Shuo, WEN Yi-Yun, GONG Mao-Chu, ZHANG Lei, YAO Yan-Ling, CHEN Yao-Qiang   

  1. Key Laboratory of Green Chemistry&Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China; School of Chemical and Biological Science and Engineering, Yantai University, Yantai 264005, Shandong Province, P. R. China
  • Received:2008-05-26 Revised:2008-06-16 Published:2008-10-08
  • Contact: CHEN Yao-Qiang E-mail:nic7501@email.scu.edu.cn

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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, 180 min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.

关键词: 光催化, TiO2, YFeO3, 共沉淀法, 柠檬酸法, 苯

Abstract: 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 YFeO3 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, X-ray 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 maximumconversion of benzene could reach 44.7% within 180 min. The YFeO3 samples prepared fromcoprecipitation 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 heterosystemphotocatalysts had narrow band-gap energies.

Key words: Photocatalysis, TiO2, YFeO3, Coprecipitation method, Citric acid method, Benzene