SCI和EI收录∣中国化工学会会刊

›› 2009, Vol. 17 ›› Issue (5): 739-745.

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Effects of Sintering Atmosphere on the Microstructure and Surface Properties of Symmetric TiO2 Membranes

ZHOU Shouyong1, ZHONG Zhaoxiang1, FAN Yiqun1, XU Nanping1, HE Yuehui2   

  1. 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;
    2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
  • Received:2008-11-20 Revised:2009-04-09 Online:2009-10-28 Published:2009-10-28
  • Supported by:
    Supported by the National Basic Research Program of China (2003CB615707);the National Natural Science Foundation of China (20636020)

Effects of Sintering Atmosphere on the Microstructure and Surface Properties of Symmetric TiO2 Membranes

周守勇1, 仲兆祥1, 范益群1, 徐南平1, 贺跃辉2   

  1. 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;
    2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
  • 通讯作者: FAN Yiqun,E-mail:yiqunfan@njut.edu.cn
  • 基金资助:
    Supported by the National Basic Research Program of China (2003CB615707);the National Natural Science Foundation of China (20636020)

Abstract: The effects of sintering atmosphere on the properties of symmetric TiO2 membranes are studied with regard to sintering behavior,porosity,mean pore size,surface composition,and surface charge properties.The experimental results show that the symmetric TiO2 membranes display better sintering activity in the air than in argon,and the mean pore diameters and porosities of the membrane sintered in argon are higher than those of the membrane sintered in the air at the same temperature.The surface compositions of the symmetric TiO2 membrane sintered in the air and in argon at different temperatures,as studied by X-ray photoelectron spectroscopy,are discussed in terms of their chemical composition,with particular emphasis on the valence state of the titanium ions.The correlation between the valence state of the titanium ions at the surface and the surface charge properties is examined.It is found that the presence of Ti3+,introduced at the surface of the symmetric TiO2 membranes by sintering in a lower partial pressure of oxygen,is related to a significant decrease in the isoelectric point.TiO2 with Ti4+ at the interface has an isoelectric point of 5.1,but the non-stoichiometric TiO2-x with Ti3+ at the interface has a lower isoelectric point of 3.6.

Key words: TiO2 membrane, sintering atmosphere, sintering behavior, surface, microstructure

摘要: The effects of sintering atmosphere on the properties of symmetric TiO2 membranes are studied with regard to sintering behavior,porosity,mean pore size,surface composition,and surface charge properties.The experimental results show that the symmetric TiO2 membranes display better sintering activity in the air than in argon,and the mean pore diameters and porosities of the membrane sintered in argon are higher than those of the membrane sintered in the air at the same temperature.The surface compositions of the symmetric TiO2 membrane sintered in the air and in argon at different temperatures,as studied by X-ray photoelectron spectroscopy,are discussed in terms of their chemical composition,with particular emphasis on the valence state of the titanium ions.The correlation between the valence state of the titanium ions at the surface and the surface charge properties is examined.It is found that the presence of Ti3+,introduced at the surface of the symmetric TiO2 membranes by sintering in a lower partial pressure of oxygen,is related to a significant decrease in the isoelectric point.TiO2 with Ti4+ at the interface has an isoelectric point of 5.1,but the non-stoichiometric TiO2-x with Ti3+ at the interface has a lower isoelectric point of 3.6.

关键词: TiO2 membrane, sintering atmosphere, sintering behavior, surface, microstructure