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Preparation of a chlorine-resistant polyamide nanofiltration membrane and it's chlorine resistance evaluation

Authors： HOU Qin, YI Gang, LU Yanbin, SUN Guangdong，Li Suoding, REN Fengwei

Units： Beijing OriginWater Membrane Technology Co., Ltd, Beijing 101407, China； Beijing OriginWater Separation Membrane Technology Co., Ltd, Beijing 101407, China

KeyWords： nanofiltration membrane; polyamide; chlorine resistance; tap water; residual chlorine;

ClassificationCode：TQ028；X799

year,volume(issue):pagination： 2023,43(4):69-74

Abstract：

Traditional polypiperazine-amide nanofiltration membrane suffered from deterioration after exposure to low concentration of residual chlorine. To tackle this problem, a novel chloride-resistant nanofiltration membrane with high flux was prepared by using 2, 3-epoxy-propyl trimethyl ammonium chloride (GTA) as modifier to graft amine group in the desalination layer and using triethanolamine as reaction catalyst and solvent activator. The modified nanofiltration membranes were analyzed by FTIR and SEM. Moreover, the effects of post-treatment time and concentration of GTA/TEOA on the separation performance of modified nanofiltration membranes were investigated to determine the optimum process conditions. Results showed that the flux of modified nanofiltration membrane increased from 54.1 LMH to 62.1 LMH and the rejection rate of sodium chloride remained at 60%. Besides, the modified nanofiltration membrane was stable during filtration of real tap water containing residual chlorine. The calcium ions rejection rate remained the same before and after the exposure to residual chlorine, revealing good chlorine resistance of the modified nanofiltration membrane on charges.

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AuthorIntro：

侯琴（1988-），女，陕西宝鸡人，硕士，反渗透纳滤膜的开发与应用研究；电子邮箱：bsy_houqin@126.com

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