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Author:
Palacio, L  Pradanos, P  Calvo, JI  Kherif, G  Larbot, A  Hernandez, A  


Journal:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS


Issue Date:
1998


Abstract(summary):

Here a series of structural parameters of a new composite membrane made by depositing a thin layer of titanium oxide (TiO2) on a cordierite support are measured. An extended bubble point method has been used, along with scanning electron microscopy. Afterwards, the permeate flux decline is analyzed when differently charged proteinic solutions, showing no retention for a clean membrane, are permeated. Permeation experiments are performed at constant concentration and pressure for bovine serum albumin (BSA) (negatively charged at neutral pH) and lysozyme (positively charged at neutral pH) aqueous solutions. It is seen that lysozyme, in spite of its significatively smaller size, fouls the membrane more, giving a faster decline kinetics compared with the bovine serum albumin within the frame of the usual models. The net surface charge of the membrane is obtained by measuring the streaming potential that appears when an electrolytic solution is permeated, whose results are interpreted in terms of a fine capillary model for the transport through the pores that takes into account the electrolyte adsorption. Different streaming potential versus electrolyte concentration behaviour is obtained leading to positive net surface charge density for both the clean and BSA fouled membranes. This positive charge is lower for the fouled than the clean membrane which is in accordance with the negative charge of BSA molecules at neutral pH. (C) 1998 Elsevier Science B.V.


Page:
291---299


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