ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
Heteroatom-Mediated Covalent Organic Framework Membranes With Nitrogen-Enriched Nanochannels for Efficient Desalination.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Covalent organic framework (COF) membranes synthesized via scalable interfacial polymerization (IP) show significant promise for water purification and desalination. However, random monomer diffusion and rapid polymerization kinetics often result in limited crystallinity and disordered pore architectures within COF membranes, compromising their separation efficacy. Here we address this challenge by introducing a heteroatom precursor engineering strategy to develop ultra-microporous, highly crystalline COF membranes tailored for monovalent ion rejection. The strategic nitrogen substitution within the aromatic ring of hydrazide monomers enables gradient reduction of their oil-water partition coefficients and reactivity, thereby finely reducing the interfacial reaction kinetics. This inhibited diffusion-reaction behavior facilitates the self-healing of nascent polymeric chains into ordered networked structures, yielding crystalline nanofilms with controlled ultrafine pore width (0.40-0.68 nm). Augmented by hetero-nitrogen-induced electrostatic interaction and hydrogen-bond recognition, the resulting ultra-microporous COF (Tp-PDHz) membranes exhibited exceptional monovalent-ion removal capability (e.g., R
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