Aminoguanidine-based polyamide nanofiltration membranes for purifying natural surface water: Superior anti-fouling properties and ultra-high organic matter/minerals selectivity

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2025-04-15 DOI:10.1016/j.desal.2025.118913

Bin Liu , Chuanfei Zhang , Xinyue Cui , Xiaozhen Lu , Xinwei Kang , Daliang Xu , Feihong Wang , Lin Wang , Daoji Wu , Xuewu Zhu

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Abstract

The current challenges of piperazine-based nanofiltration (NF) membrane technology for high-quality drinking water include improving selectivity for organic maters and minerals, as well as reducing membrane fouling. In this investigation, a series of innovative polyamide (PA) NF membranes were meticulously synthesized through the reaction of aminoguanidine nitrate (AN), serving as an aqueous phase monomer, with 1,3,5-benzotriacontanoyltrichloride (TMC). The AN was found to exhibit high reactivity and low diffusivity during interfacial polymerization (IP) when used as an aqueous phase monomer. This optimization greatly enhanced the structural integrity, mechanical properties and surface physical properties of the NF film. Notably, the PA-AN-0.5 NF membranes manifested enhanced hydrophilicity, elevated negative surface charge density, and a comparatively loose microstructure. These attributes culminated in superior permeability rates (18.8 LMH/bar) and Ca²⁺/SO₄²⁻ selectivity ratios (68.9) relative to alternative configurations. The exceptional mineral/organic selectivity demonstrated by PA-AN-0.5 NF membranes during natural surface water filtration significantly bolsters their commercial viability for producing drinking water. Furthermore, the AN-modified membrane demonstrated exceptional anti-scaling and anti-fouling properties, thereby establishing the PA-AN-0.5 NF membrane as a highly promising candidate for cost-effective purification processes aimed at producing high-quality drinking water from surface sources.

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用于天然地表水净化的氨基胍基聚酰胺纳滤膜：优异的抗污染性能和超高的有机物/矿物质选择性

哌嗪基纳滤（NF）膜技术目前面临的挑战包括提高对有机物和矿物质的选择性以及减少膜污染。本研究以氨基胍硝酸酯（AN）为水相单体，与1,3,5-苯甲酸三康烷酰三氯（TMC）反应，精心合成了一系列新型聚酰胺（PA）纳滤膜。在界面聚合（IP）中，发现AN作为水相单体时表现出高反应活性和低扩散率。这种优化大大提高了NF膜的结构完整性、机械性能和表面物理性能。值得注意的是，PA-AN-0.5 NF膜亲水性增强，表面负电荷密度升高，微观结构相对疏松。这些特性最终导致了相对于其他配置的优越渗透率（18.8 LMH/bar）和Ca2+/SO42 -选择性比（68.9）。PA-AN-0.5 NF膜在天然地表水过滤过程中表现出的优异的矿物/有机选择性，极大地提高了其生产饮用水的商业可行性。此外，an改性膜表现出优异的抗结垢和抗污染性能，从而使PA-AN-0.5 NF膜成为一种非常有前途的低成本净化工艺，旨在从地表水源生产高质量的饮用水。

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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.