Controllable cross-linking of VA-co-VAm composite membrane for pervaporation desalination under acidic conditions
In order to prepare desalination membranes with controllable cross-linking degree and acid resistance,a vinyl alcohol-vinylamine copolymer(VA-co-VAm)containing both amino and hydroxyl groups was synthesized.The cross-linked membrane was prepared using glutaraldehyde as a cross-linking agent under acidic conditions.Cross-linking degree can be carefully controlled based on the reaction between glutaraldehyde and hydroxyl groups under acidic conditions.The polymer materials and composite membranes were characterized,and the effects of polymer composition,pH of feed solution,and other factors on membrane desalination performance were studied.The results show that the composite membrane exhibits good performance under acidic conditions.Specifically,the water flux of composite membrane exceeded 12 kg·m-2·h-1 with salt rejection over 99.95％when treating a 35 g·L-1 NaCl solution(pH=1)at 60℃.The prepared membrane offers a promising platform for desalination treatment of high salt concentrated water under acidic conditions.
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