251. Interfacial synthesis of large-area ultrathin polyimine nanofilms as molecular separation membrane.
- Author
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Tiwari K, Modak S, Sarkar P, Ray S, Adupa V, Reddy KA, Pramanik SK, Das A, and Karan S
- Abstract
Thin film membranes of covalent organic frameworks are promising for high-permeance molecular separation. However, their synthesis needs a high temperature or longer reaction time, unsuitable for large-scale fabrication of thin film composite membranes. The ultrathin film of porous organic polymers as a separation layer of the composite membrane could be a close alternative to COF membranes. Here we report transition metal ion-catalyzed room temperature fabrication of the ultrathin (≈12 nm) polyimine nanofilms via interfacial polymerization of melamine and triformylphloroglucinol onto hydrolyzed polyacrylonitrile support within a short reaction time. Composite membranes exhibit high water permeance (≈78 L m
-2 h-1 bar-1 ), high rejection (99.6%) of brilliant blue R (825.9 g mol-1 ), low rejection of NaCl (≈1.8%) and Na2 SO4 (≈17%), and enable efficient molecular separation. The role of metal ion catalysts for large-area fabrication of the ultrathin polyimine nanofilm membranes used for molecular separation is demonstrated., Competing Interests: The authors declare no competing interests., (© 2022 The Author(s).)- Published
- 2022
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