Regulating MPD diffusion to enhance polyamide membrane performance via hydrogen-bonding network

IF 6.2 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2026-08-02 DOI:10.1007/s42823-026-01119-1

Yuanlin Li, Tingting Du, Xuechun Li, Desheng Xu, Yingxiao Gong, Yun Jin

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Abstract

The separation performance of polyamide (PA) membranes is governed by their cross-linking structure, a critical parameter dictated by the diffusion kinetics of 1,3-phenylenediamine (MPD) during interfacial polymerization. Herein, we introduce sodium dodecyl sulfate (SDS) into the aqueous phase to construct a strong, short-range hydrogen-bonding network with MPD molecules. This interaction effectively impedes MPD diffusion to the biphasic interface, thereby promoting the formation of a highly cross-linked PA structure. Consequently, the optimized S-PA membrane exhibits a more uniform network structure and a narrower pore size distribution. The results show that the membrane achieves water permeance of 13.5 L m^− 2 h^− 1 Mpa^− 1 coupled with a NaCl rejection exceeding 97.1%, representing a 2.5-fold enhancement in permeance compared to conventional I-PA membranes. Notably, the membrane maintains stable performance over a 350-hour test. This study elucidates the pivotal role of hydrogen-bonding networks in modulating interfacial polymerization and offers a versatile strategy for designing separation membranes with simultaneously high permeance and antifouling properties.

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通过氢键网络调节MPD扩散增强聚酰胺膜性能

聚酰胺（PA）膜的分离性能取决于其交联结构，而交联结构是1,3-苯二胺（MPD）在界面聚合过程中的扩散动力学决定的关键参数。在此，我们将十二烷基硫酸钠（SDS）引入水相中，与MPD分子构建了一个强的、短程的氢键网络。这种相互作用有效地阻碍了MPD向双相界面的扩散，从而促进了高度交联的PA结构的形成。因此，优化后的S-PA膜具有更均匀的网络结构和更窄的孔径分布。结果表明，该膜的渗透率为13.5 L m−2 h−1 Mpa−1，NaCl截留率超过97.1%，比常规I-PA膜提高2.5倍。值得注意的是，该膜在350小时的测试中保持稳定的性能。这项研究阐明了氢键网络在调节界面聚合中的关键作用，并为设计同时具有高渗透和防污性能的分离膜提供了一种通用策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.