Chlorine resistant polyelectrolyte multilayer membranes for desalination
AssigneesCommonwealth Scientific and Industrial Research Organisation, The University of Melbourne
InventorsAnita Hill, Kwun Lun Cho, Francesco Caruso, Sandra Elizabeth Kentish
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Abstract
The present invention relates to chlorine resistant polyelectrolyte multilayer membranes which can be used as reverse osmosis, forward osmosis or nanofiltration membranes for applications such as desalination and water purification and methods of making membranes of this type.
Claims19
A membrane comprising (a) a water permeable charged substrate and (b) a plurality of polyelectrolyte bilayers deposited on at least one side of the substrate, each polyelectrolyte bilayer comprising a layer of a cationic polyelectrolyte material and a layer of an anionic polyelectrolyte material, wherein the anionic polyelectrolyte material is a sulfonated polysulfone, wherein the charged substrate is a polyethyleneimine treated polysulfone, wherein the cationic polyelectrolyte material is selected from the group consisting of poly(acrylamide-co-diallyldimethyl ammonium chloride), poly(allylamine hydrochloride), and poly(diallyldimethylammonium chloride).
A method of forming a membrane, the method comprising the steps of:
- (a) providing a charged substrate, wherein the charged substrate is a polyethyleneimine treated polysulfone;
- (b) depositing a polyelectrolyte bilayer on at least one side of the substrate, each polyelectrolyte bilayer comprising a layer of a cationic polyelectrolyte material and a layer of an anionic polyelectrolyte material wherein the anionic polyelectrolyte material is a sulfonated polysulfone, wherein the cationic polyelectrolyte material is selected from the group consisting of poly(acrylamide-co-diallyldimethyl ammonium chloride), poly(allylamine hydrochloride), and poly(diallyldimethylammonium chloride).
Dependencies are inferred from the claim text.