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

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

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. 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

收稿日期:2008-11-20 修回日期:2009-04-09 出版日期:2009-10-28 发布日期:2009-10-28
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)

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. 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)

摘要/Abstract

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 TiO_2-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

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 TiO_2-x with Ti³⁺ at the interface has a lower isoelectric point of 3.6.

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

周守勇, 仲兆祥, 范益群, 徐南平, 贺跃辉. Effects of Sintering Atmosphere on the Microstructure and Surface Properties of Symmetric TiO₂ Membranes[J]. , 2009, 17(5): 739-745.

ZHOU Shouyong, ZHONG Zhaoxiang, FAN Yiqun, XU Nanping, HE Yuehui. Effects of Sintering Atmosphere on the Microstructure and Surface Properties of Symmetric TiO₂ Membranes[J]. , 2009, 17(5): 739-745.

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

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

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