The rejection of anionic dyes solutions

using an ultrafiltration ceramic membrane

 

 H. Loukili1*, S. Alami Younssi1, A. Albizane1, J. Bennazha1, M. Persin2, A. Larbot2, S. Tahiri3

1Laboratoire des Matériaux, Catalyse et Environnement, Faculté des Sciences et Techniques 

 de Mohammedia, BP 146 Mohammedia (20650) Maroc
2 Institut Européen des Membranes, UMR 5635 CNRS ENSCM UMII, 1919 Route de Mende  34293 Montpellier cedex 5 France

3 Faculté des Sciences El Jadida, Département de Chimie, BP 20 El Jadida, Maroc

* Corresponding author. E-mail: h_loukili@yahoo.fr

Received: 03 October 2006; revised version accepted: 13 February 2007

 

Abstract 

     The characterization of electrical surface properties of membrane materials is critical for understanding and predicting filtration performances of membranes. In this paper, electrical properties and rejection rates of dyes on ZnAl2O4 -TiO2 (50/50) ceramic ultrafiltration membranes were studied. A correlation between the filtration results and the streaming potential measured through the membrane was established. The ZnAl2O4–TiO2 ultrafiltration layers obtained by sol–gel process deposited on a macroporous support prepared from cordierite coated with a zirconia microfiltration interlayer presents a pore diameter centred on 5 nm measured by nitrogen adsorption-desorption. The water permeability of the membrane is 7.9 L/h.m².bar. The cut off given for the 90% rejection of calibrated polyethylene glycol polymers is about 3000 Da.

 

Keywords: Membrane; Ceramic; Streaming potential; Retention of dyes; Donnan effect; Sieving mechanism

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