Preparation and thermal resistance performance for PPTA composite nanofiltration membrane
In this paper,high flux heat-resistant PPTA/PA composite nanofiltration membranes were prepared by interfacial polymerization using para-aromatic polyamide(PPTA)ultrafiltration membrane as the base membrane and Piperazine(PIP)and trimesoyl chloride(TMC)as the aqueous and oil phase monomers,respectively.The effects of interfacial polymerization on the high-temperature nanofiltration performance of PPTA/PA composite nanofiltration membranes were investigated.The surface morphology and dense layer structure of the composite nanofiltration membranes were observed,and the permeance,heat resistance and anti-pollution properties were investigated.The results showed that when the PIP concentration was 15％wt,the TMC concentration was 2.5％wt,the heat treatment temperature and time were 60℃and 8 min,respec-tively,the PPTA/PA composite nanofiltration membrane could retain more than 95％of rejection for different dye molecules and more than 90％of rejection for divalent salts,Under high temperature conditions,the obtained PPTA/PA composite nanofiltration membranes exhibited excellent dye desalination performance,and the permeate flux could reach more than 50 L·m-2·h-1·MPa-1while the rejection rate of Congo red and Na2SO4 remained at 99％.
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