Elaboration and properties of TiO2-ZnAl2O4 ultrafiltration membranes

New ceramic ultrafiltration membranes with a pore size diameter in the rang e of 6 nm have been prepared by sol gel route using TiO2 and ZnAl2O4 mixed sols. The main characteristics of the membranes an given and their filterin g properties discussed by taking into account of the electrophoretic behavi or of powder suspension elaborated with the different sols used for the mem brane preparation. As for other membrane materials, the salt rejection rate depends mainly on the surface charge of the material which is correlated t o the zeta potential. (C) 2001 Elsevier Science Ltd. All rights reserved.