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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Alumina and titania multilayer membranes for nanofiltration: Preparation, characterization and chemical stability
Journal of Membrane Science, Volume 207, No. 1, Year 2002
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Description
The preparation and characterization of porous ceramic multilayer nanofiltration (NF) membranes is described. During preparation, special care was given to each sub-layer that forms a part of the multilayer configuration: the macroporous substrate, the membrane interlayers and the NF toplayers. High-quality macroporous supports are prepared from α-Al2O3. Three types of colloidal sol-gel derived mesoporous interlayers are considered: Al2O3, TiO2 and mixed Al2O3-TiO2. The active NF toplayer is a very thin and fine textured polymeric TiO2 toplayer. Optimized α-Al2O3/γ-Al2O3/anatase and α-Al2O3/anatase/anatase multilayer configurations show high retentions for relatively small organic molecules (molecular weight cut-off <200). Different membrane layers have very different crystallographic properties resulting in a considerably different chemical stability. Corrosion measurements showed that application of a multilayer configuration including weakly crystallized γ-Al2O3 layers is restricted to mild aqueous media (pH 3-11) or non-aqueous media (organic solvents). For NF applications in aqueous media with a lower or higher pH, the multilayer membrane composed of anatase on a α-Al2O3 support is to be preferred. © 2002 Elsevier Science B.V. All rights reserved.
Authors & Co-Authors
Buekenhoudt, Anita
Belgium, Mol
Vlaamse Instelling Voor Technologisch Onderzoek
Dotremont, Chris T.E.
Belgium, Mol
Vlaamse Instelling Voor Technologisch Onderzoek
Luyten, Jan J.
Belgium, Mol
Vlaamse Instelling Voor Technologisch Onderzoek
Leysen, Roger J.F.
Belgium, Mol
Vlaamse Instelling Voor Technologisch Onderzoek
van der Bruggen, Bart
Belgium, Leuven
Ku Leuven
Maes, Guido
Belgium, Leuven
Ku Leuven
Statistics
Citations: 269
Authors: 6
Affiliations: 2
Identifiers
Doi:
10.1016/S0376-7388(02)00053-4
ISSN:
03767388