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表面接枝TAPI改善聚酰胺纳滤膜的耐氯性能

作者：嵇华忠，韩家凯，钱璟俐，刘大朋，洪耀良

单位： 1.苏州科技大学环境科学与工程学院，苏州 215009；2.水处理技术与材料协同创新中心，苏州 215009

关键词：界面聚合，纳滤，表面接枝改性，TAPI，耐氯

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2023,43(2):87-94

摘要：

为了改善聚酰胺纳滤膜的耐氯性，通过表面改性将2,4,6-三氨基嘧啶（TAPI）接枝到聚酰胺膜表面，利用ATR-FTIR、SEM和接触角测定仪等手段对改性膜进行表征。结果表明，在TAPI最优质量分数为0.3%，最佳反应时间为3min时，改性膜在0.4MPa操作压力下，纯水通量为43.52L·m-2·h-1，对Na2SO4、MgSO4、NaCl和MgCl2的截留率分别为95.30%、88.04%、45.32%、34.04%。pH=3.5、7、10.5值下的氯化实验中，改性膜的通量损失量均比哌嗪基纳滤膜减少20L·m-2·h-1，并且截留率保持稳定在95%以上。

In order to improve the chlorine resistance of polyamide nanofiltration membrane, 2,4,6-triaminopyrimidine (TAPI) was grafted onto the surface of polyamide membrane by surface modification. The modified membrane was characterized by ATR-FTIR, SEM and contact angle tester. The results showed that when the optimal mass fraction of TAPI was 0.3% and the optimal reaction time was 3 min, the pure water flux of the modified membrane was 43.52 L·m-2·h-1 at 0.4 MPa operating pressure, and the retention rates of Na2SO4, MgSO4, NaCl and MgCl2 were 95.30%, 88.04%, 45.32% and 34.04% respectively. In the chlorination experiment at pH=3.5, 7 and 10.5, the flux loss of the modified membrane was reduced by 20L·m-2·h-1compared with that of the piperazine based nanofiltration membrane, and the rejection rate remained stable above 95%.

基金项目：

国家自然科学基金“基于液态分子灌注的仿生复合多孔膜及其在膜蒸馏中的抗污染机制研究”（51908394）。

作者简介：

嵇华忠（1996- ），男，江苏丹阳人，硕士研究生，研究方向为污水处理与回用技术，E-mail：jihz2020@163.com

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