Anhydrous interfacial polymerization of sub-1 Å sieving polyamide membrane

Guangjin Zhao, Haiqi Gao, Zhou Qu, Hongwei Fan () and Hong Meng ()
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Guangjin Zhao: Beijing University of Chemical Technology
Haiqi Gao: College of Chemistry, Xinjiang University
Zhou Qu: Beijing University of Chemical Technology
Hongwei Fan: Beijing University of Chemical Technology
Hong Meng: College of Chemistry, Xinjiang University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Highly permeable polyamide (PA) membrane capable of precise ionic sieving can be utilized for many energy-efficient chemical separations. To fulfill this target, it is crucial to innovate membrane-forming process to induce a narrow pore-size distribution. Herein, we report an anhydrous interfacial polymerization (AIP) at a solid-liquid interface where the amine layer sublimated is in direct contact with the alkane containing acyl chlorides. In such a heterophase interface, water-caused side reactions are eliminated, and the amines in compact arrangement enable an intensive and orderly IP reaction, leading to a unique PA layer with an ionic sieving accuracy of 0.5 Å. The AIP-PA membrane demonstrates excellent separation selectivities of monovalent and divalent cations such as Mg2+/Li+ (78.3) and anions such as Cl-/SO42- (29.2) together with a high water flux up to 13.6 L m−2 h−1 bar−1. Our AIP strategy may provide inspirations for engineering high-precision PA membranes available in various advanced separations.

Date: 2023
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DOI: 10.1038/s41467-023-43291-2

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