Abstract
Abstract A new acid stable copolyamide [PEI-Mel]-PA membrane was developed via interfacial polymerization assisted by melamine. The physico-chemical properties and separation ability were studied. It was compared with an acid stable polysulfonamide membrane in terms of acid stability. Melamine improved the thermal and acid stability and made the surface of the membrane more positively charged. The decreases in MgSO 4 rejections were 56% and 31% for [PEI-Mel]-PA membrane after H 2 SO 4 and HNO 3 treatment, respectively. The stability of [PEI-Mel]-PA improved up to 16% and 48% in H 2 SO 4 and HNO 3 , respectively in comparison with PEI-PA membrane. It recovered more than 97% of the acid.
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