Study of electrokinetic properties of plate ceramic membranes by electroosmosis and streaming potential

Two electrokinetic techniques, electro-osmosis and streaming potential, have been used to investigate the charge characteristics of mixed alumina/titania/silica microfiltration membranes. Both methods can be applied to the membrane itself and streaming potential can be measured during the filtration...

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Bibliographic Details
Published in:Desalination 1998-09, Vol.119 (1), p.309-313
Main Authors: Szymczyk, A., Fievet, P., Mullet, M., Reggiani, J.C., Pagetti, J.
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry
Colloidal state and disperse state
Electroosmosis
Environmental Sciences
Exact sciences and technology
General and physical chemistry
Isoelectric point
Membranes
Shearing plane
Streaming potential
Zeta potential
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Summary:Two electrokinetic techniques, electro-osmosis and streaming potential, have been used to investigate the charge characteristics of mixed alumina/titania/silica microfiltration membranes. Both methods can be applied to the membrane itself and streaming potential can be measured during the filtration process. Electroosmosis and streaming potential give very close results in term of isoelectric points, whatever the electrolyte is. The low isoelectric point value suggests that the silica contained in membranes is mainly concentrate at the surface. Both techniques show the modification of the electrokinetic surface properties due to the specific adsorption of sulphate ions onto the membranes surface. The greater zeta potential values determined from electroosmotic flow rate measurements suggest that the shearing plane is nearer the solid surface during electroosmosis. This assumption is strengthened by the increase of the ratio between the zeta potentials determined from both techniques as ionic strength increases.
ISSN:0011-9164
1873-4464
DOI:10.1016/S0011-9164(98)00174-X