Abstract:

Aromatic polyamide thin-film composite（TFC）nanofiltration（NF）membranes are very sensitive to a chlorine disinfectant. The oxidative degradation takes place under active chlorine conditions. The free chlorine in feed stream can cause degradation of crosslinked aromatic polyamides and ultimately result in the decline of the membrane separation performance，which shortens the membrane life and greatly limits the further application and development of NF membranes. Series studies of NF materials and structures in recent years are briefly summarized. This review is focused on the oxidative degradation of aromatic polyamides and the mechanism of the decline of the membrane separation performance. The prospect on the development of the oxidation resistance of aromatic polyamide thin-film composite nanofiltration membranes is further analyzed.