膜科学与技术

一种耐氯性聚酰胺纳滤膜制备及耐氯性评价

作者：侯琴，衣刚，卢彦斌，孙广东，李锁定，任凤伟

单位： 1.北京碧水源膜科技有限公司，北京市 101400 中国； 2.北京碧水源分离膜科技有限公司，北京市 101400 中国

关键词：纳滤膜；聚酰胺；耐氯性；自来水；余氯

出版年,卷(期):页码： 2023,43(4):69-74

摘要：

针对传统聚哌嗪酰胺纳滤膜在低浓度余氯中暴露后脱盐性能下降的问题，本文采用2,3-环氧丙基三甲基氯化铵(GTA)对膜脱盐层中的哌嗪端胺基进行后处理修饰，以三乙醇胺作为反应催化剂和溶剂活化剂，制备了一种通量高的耐氯性纳滤膜。利用FTIR、SEM对改性纳滤膜结构进行了分析，考察了GTA和三乙醇胺的浓度、后处理时间对纳滤膜分离性能的影响，确定了最佳工艺条件。实验结果表明，优化复合膜通量由54.1 LMH提高到62.1 LMH，氯化钠脱盐率保持在60%左右，并且在含有余氯的自来水条件下测试性能稳定。暴露余氯后的钙离子脱盐率稳定，展现出良好的耐氯荷电稳定性。

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.

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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