To obtain high-performance polyester (PE) nanofiltration (NF) membranes for desalination, most PE NF membranes are fabricated with high aqueous monomer concentration, or high reaction temperature, or long reaction time. The interfacial polymerization (IP) reaction rate between hydroxyl groups and acyl chloride groups is promoted but the cost of membrane fabrication is also increased. In this work, Bis-tris (bis(2-hydroxyethyl)-amino-tris(hydroxymethyl)methane) with rich hydroxyl groups is first utilized as an aqueous monomer to fabricate PE membranes under conventional IP conditions. The fabricated Bis-tris PE membranes feature strong hydrophilicity, excellent electronegativity, and ultra-thin selective layers, which are conducive to improving desalination performance. The optimized Bis-tris PE membrane shows excellent water permeance of 22.5 L m h bar and a satisfactory NaSO rejection of 96.9 %. Additionally, the Bis-tris PE membrane displays superior long-term stability and chlorine resistance under 96 h cross-flow filtration. This research enlightens the promising potential of Bis-tris as a novel and economic aqueous monomer for the fabrication of high-performance PE NF membranes.

中文翻译：

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通过一步界面聚合制备的双-三基聚酯纳滤膜用于海水淡化


为了获得用于海水淡化的高性能聚酯（PE）纳滤（NF）膜，大多数PE纳滤膜采用高含水单体浓度、或高反应温度或长反应时间来制备。羟基和酰氯基团之间的界面聚合（IP）反应速率得到提高，但膜制造成本也增加。在这项工作中，首先利用具有丰富羟基的Bis-tris（双（2-羟乙基）-氨基-三（羟甲基）甲烷）作为水性单体在常规IP条件下制备PE膜。所制备的Bis-tris PE膜具有强亲水性、优异的电负性和超薄的选择性层，有利于提高海水淡化性能。优化的 Bis-tris PE 膜具有 22.5 L mh bar 的优异水渗透性和令人满意的 96.9 % 的 NaSO 截留率。此外，Bis-tris PE 膜在 96 小时错流过滤下表现出卓越的长期稳定性和耐氯性。这项研究揭示了 Bis-tris 作为一种新型、经济的水性单体用于制造高性能 PE 纳滤膜的巨大潜力。