Reactive substrate-driven interfacial polymerization for wrinkled polyamide membranes with enhanced permeance

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters Pub Date : 2025-05-24 DOI:10.1016/j.memlet.2025.100101

Ping Xu , Shaofan Duan , Pengfei Zhang , Kecheng Guan , Hideto Matsuyama

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Abstract

A novel strategy was developed to regulate polyamide (PA) membrane morphology and performance by introducing a reactive copolymer, poly(styrene-alt-maleic anhydride) (PSMA), into the polyethersulfone (PES) substrate. The reactive anhydride groups of PSMA first react with piperazine (PIP) monomers, subsequently affecting diffusion and reaction dynamics of the remaining monomers during interfacial polymerization (IP) for PA layer formation. As a result, wrinkled PA morphologies were formed, enhancing the surface roughness and effective filtration area. The wrinkled PA membranes exhibited significantly improved water permeance (up to 19.7 L m^-2 h^-1 bar^-1) while maintaining comparable rejection rates of 98.7 %, 98.2 %, 85.7 %, 6.1 %, 7.1 % for Na₂SO₄, MgSO₄, MgCl₂, LiCl, and NaCl, respectively, due to the similar free volume to unmodified membranes. This work offers a promising approach to tailor membrane structure and optimize nanofiltration performance via substrate reactivity engineering.

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活性底物驱动的界面聚合在具有增强渗透性的起皱聚酰胺膜上

通过在聚醚砜（PES）底物中引入反应性共聚物聚苯乙烯-马来酸酐（PSMA），开发了一种调节聚酰胺（PA）膜形态和性能的新策略。PSMA的活性酸酐基团首先与哌嗪（PIP）单体发生反应，随后在界面聚合（IP）过程中影响剩余单体的扩散和反应动力学，从而形成PA层。结果，形成了皱褶状的PA形态，提高了表面粗糙度和有效过滤面积。皱化后的PA膜对Na2SO4、MgSO4、MgCl2、LiCl和NaCl的截除率分别为98.7%、98.2%、85.7%、6.1%和7.1%，这是由于其自由体积与未改性膜相似。这项工作为通过衬底反应性工程定制膜结构和优化纳滤性能提供了一种有前途的方法。

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来源期刊

Journal of Membrane Science Letters

CiteScore

4.00

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