Nanofiltration membranes (NF) possessing high flux, excellent selectivity, and chlorine resistance are urgently required for healthy drinking water treatment. In this work, we prepared a high-performance polyesteramide (PEA) nanofiltration membrane featuring polyester and polyamide composite structures using piperazine (PIP) and polyvinyl alcohol (PVA) as co-monomers via sodium hydroxide catalyzing interfacial polymerization. The resultant NF membranes' surface morphology, chemical structure, filtration performance, and chlorine stability were systematically evaluated. The optimized PEA membrane (PEA-TFC) possessed a terraced morphology and relatively high roughness (23.9 nm). During purifying real surface water, a high flux (20.29 LMH bar−1) with <50 % mineral rejection and over 70 % organic matter removal was achieved for PEA-TFC, demonstrating excellent organic/mineral selectivity. In addition, the polyamide and polyester structures provided uniform pore size distribution and fewer chlorine-active sites, granting PEA-TFC excellent chlorine resistance and stability. The exceptional organic/mineral selective separations and remarkable chlorine resistance endow the PEA-TFC as a promising candidate for healthy drinking water NF.

中文翻译：

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定制用于净化天然地表水的高性能聚酯酰胺 NF 膜：增强矿物质保存、耐氯性和机制


健康饮用水处理迫切需要具有高通量、出色选择性和耐氯性的纳滤膜 （NF）。在这项工作中，我们使用哌嗪 （PIP） 和聚乙烯醇 （PVA） 作为共聚单体，通过氢氧化钠催化界面聚合制备了一种具有聚酯和聚酰胺复合结构的高性能聚酯酰胺 （PEA） 纳滤膜。系统评价了所得 NF 膜的表面形貌、化学结构、过滤性能和氯稳定性。优化的 PEA 膜 （PEA-TFC） 具有阶梯形形态和相对较高的粗糙度 （23.9 nm）。在净化真实地表水的过程中，PEA-TFC 实现了高通量 （20.29 LMH bar-1），矿物去除率为 <50%，有机物去除率超过 70%，表现出优异的有机物/矿物选择性。此外，聚酰胺和聚酯结构提供了均匀的孔径分布和更少的氯活性位点，使 PEA-TFC 具有出色的耐氯性和稳定性。卓越的有机/矿物选择性分离和卓越的耐氯性使 PEA-TFC 成为健康饮用水 NF 的有前途的候选者。