Summary
Desalination technology leaped forward with the development of interfacially polymerized reverse osmosis (RO) membranes patented by Cadotte in 1981 (1). A huge performance improvement came largely from a selective layer with a self-limiting thickness on the order of 100 nm formed through interfacial polymerization at an oil-water interface on a microporous support (2). Continued membrane property improvements realized during the past four decades have resulted mainly from processing or manufacturing modifications that are often proprietary, rather than by modifying the core chemistry or membrane preparation process (3, 4). The thin, inhomogeneous selective layer has frustrated efforts to satisfactorily characterize polyamide membrane structure and transport properties for decades (5–7). On page 72 of this issue, Culp et al. (8) leverage advances in microscopy and modeling to provide critical insights into structure–property relationships for current state-of-the-art RO membranes that could be used to rationally improve their performance.
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January 01, 2021 at 02:11AM
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Why polyamide reverse-osmosis membranes work so well - Science Magazine
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