文章基本信息

标题：Electrostatic-modulated interfacial polymerization toward ultra-permselective nanofiltration membranes
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作者：Xinda You ; Ke Xiao ; Hong Wu 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2021
卷号：24
期号：4
页码：1-58
DOI：10.1016/j.isci.2021.102369
语种：English
出版社：Elsevier
摘要：SummaryInterfacial polymerization (IP) is a platform technology for ultrathin membranes. However, most efforts in regulating the IP process have been focused on short-range H-bond interaction, often leading to low-permselective membranes. Herein, we report an electrostatic-modulated interfacial polymerization (eIP)viasupercharged phosphate-rich substrates toward ultra-permselective polyamide membranes. Phytate, a natural strongly charged organophosphate, confers high-density long-range electrostatic attraction to aqueous monomers and affords tunable charge density by flexible metal-organophosphate coordination. The electrostatic attraction spatially enriches amine monomers and temporally decelerates their diffusion into organic phase to be polymerized with acyl chloride monomers, triggering membrane sealing and inhibiting membrane growth, thus generating polyamide membranes with reduced thickness and enhanced cross-linking. The optimized nearly 10-nm-thick and highly cross-linked polyamide membrane displays superior water permeance and ionic selectivity. This eIP approach is applicable to the majority of conventional IP processes and can be extended to fabricate a variety of advanced membranes from polymers, supermolecules, and organic framework materials.Graphical abstractDisplay OmittedHighlights•Electrostatic-modulated interfacial polymerization is proposed for the first time•Electrostatic attraction regulates the spatial-temporal distribution of amine monomers•Monomer regulation leads to reduced thickness and enhanced cross-linking of membrane•Ultrathin and highly cross-linked polyamide membrane displays superior permselectivitySupramolecular Materials; Materials Science; Materials Chemistry; Materials Synthesis; Polymers