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Preparation and characterization of alumina membranes and alumina–titania composite membranes

Published online by Cambridge University Press:  31 January 2011

Li Shi  and
Ning-Bew Wong
Li Shi
Affiliation:
Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
Ning-Bew Wong
Affiliation:
Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
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Abstract

Supported and unsupported γ-alumina membranes and alumina–titania composite membranes were prepared using the sol-gel method. In the course of preparation, effects of acid concentration, type of acid, alkoxide, and binder on the particle size of the sols and pore size of the membranes were investigated by thermogravimetry and differential thermal analysis, N2 physisorption, and light scattering. It was observed that the particle sizes of all the sols had only a small affect on the pore sizes of the membranes. Qualities of the membranes were improved by addition of polyvinyl alcohol as binder to the boehmite precursor. This resulted in less critical but more controllable drying and calcining procedures. Composite membranes with different pore sizes from 3.2 to 4.8 nm and surface areas retained above 100 m2/g could be regulated by different alumina-to-titania ratios.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3599 - 3603
Copyright
Copyright © Materials Research Society 1999

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