Self-assembled polyelectrolyte multilayer membranes with highly improved pervaporation separation of ethanol/water mixtures |
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| Institution: | 1. Centre for Surface Chemistry and Catalysis, Faculty of Bioscience Engineering, K.U. Leuven, Kasteelpark Arenberg-23, P.O. Box 2461, 3001 Leuven, Belgium;2. Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA;3. Laboratory of Solid-State Physics and Magnetism, Department of Physics and Astronomy, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;1. Membrane Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Faculty of Science and Technology, P.O. Box 217, 7500 AE Enschede, The Netherlands;2. Université de Toulouse, INPT, UPS, Laboratoire de Génie Chimique, 4 Allée Emile Monso, F31432 Toulouse, France;3. Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, United States;1. Membrane Science and Technology, Mesa+Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, The Netherlands;2. Pentair X-Flow, P.O. Box 739, 7500 AS, The Netherlands |
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| Abstract: | Ethanol/water pervaporation through ultrathin polyelectrolyte multilayer membranes is described. The membranes were prepared by the layer-by-layer technique, i.e. by alternating sequential adsorption of cationic and anionic polyelectrolytes on a porous support. The separation capability was optimized by variation of the chemical structure of the polyelectrolytes, by variation of pH and ionic strength of the polyelectrolyte solutions used for membrane preparation and by annealing of the polyelectrolyte membranes. It was found that the separation is mainly affected by the charge density of the polyelectrolytes which is controlled by the chemical structure and the degree of ionisation of the polar groups. Selectivity for water was highest, if polyelectrolytes of high charge density such as polyethyleneimine (PEI), polyvinylamine (PVA) and polyvinylsulfate (PVS) were used and if the pH of the polyelectrolyte solutions was equal to the mean of the pKa values of the corresponding cationic and anionic polyelectrolyte. Best results were obtained for PVA/PVS and PEI/PVS membranes which are characterized in detail with regard to their separation behavior. |
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