Title: Electrokinetic characterization of mixed alumina-titania-silica MF membranes by streaming potential measurements
Abstract: The electrokinetic properties of ceramic microfiltration membranes are studied under various conditions of pH, ionic strength and ionic species in solution. The modification of the surface acid-basic equilibria is analyzed from the streaming potential measurements. The presence of silica impurities leads to a modification of the membrane electrokinetic behavior: its isoelectric point moves from pH 6.5±0.1 to 4.5±0.1. Zeta potential is calculated from streaming potential measurements and the Helmholtz-Smoluchowski relationship. The change of the zeta potential sign and the shifting of the isoelectric point with CaCl2 and Na2SO4 solutions show specific adsorption of calcium and sulfate ions onto the surface.
Publication Year: 1998
Publication Date: 1998-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 19
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