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Improvement of chlorine resistance of polyamide nanofiltration membrane by surface grafting TAPI

Authors： Ji Huazhong, Han Jiakai,Qian jingli ,Liu Dapeng,Hong Yaoliang

Units： 1. School of Environment Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China; 2. Collaborative Innovation Center of Water Treatment Technology And Material, Suzhou University of Science and Technology, Suzhou, 215009, China

KeyWords： interfacial polymerization, nanofiltration, surface graft modification, TAPI, chlorine resistance

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(2):87-94

Abstract：

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%.

Funds：

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）。

AuthorIntro：

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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