物理化学学报 >> 2001, Vol. 17 >> Issue (03): 273-277.doi: 10.3866/PKU.WHXB20010319

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溶胶-凝胶法制备复合MxOy-TiO2光催化剂

张玉红;熊国兴;杨维慎;傅贤智   

  1. 中国科学院大连化学物理研究所,催化基础国家重点实验室,大连　116023;福州大学光催化研究所,福州　350002
  • 收稿日期:2000-10-08 修回日期:2000-11-07 发布日期:2001-03-15
  • 通讯作者: 熊国兴 E-mail:gxxiong@dicp.ac.cn

Preparation of MxOy-TiO2 Photocatalysts by Sol-gel Method

Zhang Yu-Hong;Xiong Guo-Xing;Yang Wei-Shen;Fu Xian-Zhi   

  1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,The Chin ese Academy of Sciences,Dalian　116023;Research Institute of Photocatalysis,Fuz hou University,Fuzhou　350002
  • Received:2000-10-08 Revised:2000-11-07 Published:2001-03-15
  • Contact: Xiong Guo-Xing E-mail:gxxiong@dicp.ac.cn

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摘要： 以无机盐TiCl4为原料制备TiO2溶胶,并利用溶胶胶粒修饰法制备SiO2TiO2、ZrO2 TiO2、WO3TiO3、MoO3TiO2及Pt/TiO2光催化剂,用于光催化氧化甲醛反应,考察添加物对 催化剂光催化性能的影响.其中,SiO2TiO2催化剂的光催化氧化降解甲醛性能最好,而MoO3 TiO2的催化性能最差.SiO2TiO2催化剂优良的光催化性能可归于SiO2TiO2催化剂的高 比表面积,高空隙率,小晶粒粒径和强吸光性能等性质的综合影响.

关键词: 溶胶-凝胶, 光催化, 甲醛, MxOy-TiO2

Abstract: Titania sols were prepared by acid hydrolysis of a TiCl4 precursor and mixed oxides SiO2TiO2,ZrO2TiO2,WO3TiO3 and MoO3TiO2 as well as Pt/TiO2 catalysts for the photocatalytic oxidation of formaldehyde were obtained by usin g the method of the modification of sol particles.The influence of the additives on the photocatalytic activity was investigated.Comparing with pure TiO2,the ad dition of silica or zirconia increased the photocatalytic activity,while the add ition of Pt and MoO3 decreased the activity,and the addition of WO3 had little e ffect on the activity.Among these catalysts,the activity of the SiO2TiO2 catal yst was the best while that of the MoO3TiO2 catalyst was the worst.It is of gr eat significance that the conversion of formaldehyde was increased up to 94％ ov er the SiO2TiO2 catalyst.The increased activity of the SiO2TiO2 catalyst was due to the higher surface area and porosity,the smaller crystallite size and th e stronger adsorption of UV light.A comparison of our catalyst compositions with those in the literature suggested that the difference in activity due to the ad dition of a second metal oxide maybe caused by the surface chemistry of the cata lysts,particularly the acidity.

Key words: Sol-gel, Photocatalysis, Formaldehyde, MxOy-TiO2