Imidazole assisted molecular-scale regulation of polyamide for preparing reverse osmosis membrane with enhanced water permeance

渗透 界面聚合 反渗透 化学 聚酰胺 化学工程 纳滤 水解 咪唑 水溶液 选择性 高分子化学 有机化学 聚合物 单体 催化作用 渗透 生物化学 工程类
作者
Zhaohui Fei,Chi Jiang,Mengxin Li,Yingfei Hou
出处
期刊:Journal of environmental chemical engineering [Elsevier BV]
卷期号:10 (4): 108146-108146 被引量:7
标识
DOI:10.1016/j.jece.2022.108146
摘要

The development of reverse osmosis (RO) technology is still hindered by many obstacles, especially the low water permeance of RO membrane. Herein, an interfacial polymerization regulated by N-acyl imidazole chemistry was proposed to fabricate high permeance RO membranes. The improvement of membrane performance was achieved by simply adding 2-Methylimidazole (Hmim) into aqueous phase. More angstrom-scale free volume elements, which acted as water molecule transport channels, were formed in the polyamide separation layer due to the reaction and hydrolysis of Hmim. As a result, a substantial increase in water permeance was achieved while maintaining high NaCl rejection. In addition, more carboxylic acid groups were formed on the membrane surface due to the hydrolysis of N-acyl imidazole, thereby imparting higher hydrophilicity and anti-fouling properties to the membrane. With the addition of 1.5 w/w% Hmim, the water permeance of the prepared RO membrane was improved to 4.4 L m −2 h −1 bar −1 , nearly 4.5 times compared to the control group, while maintaining a high NaCl rejection of above 98 %, thus successfully overcoming the permeability-selectivity trade-off limit. This work paves a new idea for the development of additives in the preparation of RO membranes. • N-acyl imidazoles assisted interfacial polymerization (IP) is proposed for the fabrication of reverse osmosis (RO) membrane. • 2-Methylimidazole (Hmim) participates in IP reaction and then leaves due to the hydrolysis of N-acyl imidazoles. • The introduction of Hmim endows the RO membrane with more water channels and higher hydrophilicity. • The enhanced RO membrane exhibits high water permeance and anti-fouling performance.
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