Santos, LRBSantilli, Celso Valentim [UNESP]Larbot, A.Persin, M.Pulcinelli, Sandra Helena [UNESP]2014-05-202014-05-202001-03-01Separation and Purification Technology. Amsterdam: Elsevier B.V., v. 22-3, n. 1-3, p. 17-22, 2001.1383-5866http://hdl.handle.net/11449/39540SnO2 supported membranes, presenting 3.0 nm average pore size, have been produced by sol casting on alumina tubular substrate using aqueous colloidal suspensions prepared by sol-gel route. The selectivity and flux throughout SnO2 membrane were analyzed by permeation experiments, using a laboratory tangential filtration pilot equipped with a monotubular membrane. To evaluate the effect of the surface charge at the membrane-solution interface, aqueous salt solutions (NaCl, Na2SO4, CaCl, and CaSO4) of different ionic strength have been filtered and the results correlated with the values of zeta potential measured at several pH. The results show that the retention coefficient is dependent on the electrolyte present in aqueous solution decreasing as: (dication, monoanion) > (monocation, monoanion) approximate to (monocation, dianion) > (dication, dianion). The surface charge and the cation adsorption capacity play a determinant role in these selectivity sequences. (C) 2001 Elsevier B.V. B.V. All rights reserved.17-22engSnO2 membranesultrafiltrationsol-gel processzeta potentialretention coefficientsArtigo10.1016/S1383-5866(00)00148-9WOS:000167129000002Acesso restrito558429868187086599712025852869670000-0002-8356-8093