Tailoring high-performance polyesteramide NF membranes for purifying natural surface water: Enhanced minerals preservation, chlorine resistance, and mechanisms

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-11-02 DOI:10.1016/j.desal.2024.118267

Xuewu Zhu , Feiyue Ge , Xinwei Kang , Liping Qiu , Bin Liu , Jingtao Xu , Feihong Wang , Daoji Wu , Zhe Yang , Daliang Xu , Heng Liang

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Abstract

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.

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定制用于净化天然地表水的高性能聚酯酰胺无负压膜：强化矿物质保存、耐氯性和机制

健康饮用水处理迫切需要具有高通量、优异选择性和耐氯性的纳滤膜（NF）。在这项工作中，我们以哌嗪（PIP）和聚乙烯醇（PVA）为共聚单体，通过氢氧化钠催化界面聚合，制备出了一种高性能聚酯酰胺（PEA）纳滤膜，它具有聚酯和聚酰胺复合结构。结果对 NF 膜的表面形态、化学结构、过滤性能和氯稳定性进行了系统评估。优化后的 PEA 膜（PEA-TFC）具有阶梯状形态和相对较高的粗糙度（23.9 nm）。在净化实际地表水的过程中，PEA-TFC 的通量很高（20.29 LMH bar-1），矿物质去除率为 50%，有机物去除率超过 70%，显示出卓越的有机物/矿物质选择性。此外，聚酰胺和聚酯结构提供了均匀的孔径分布和较少的氯活性位点，使 PEA-TFC 具有出色的耐氯性和稳定性。出色的有机物/矿物质选择性分离和显著的耐氯性使 PEA-TFC 成为健康饮用水 NF 的理想候选材料。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.