聚酰胺
界面聚合
膜
纳滤
材料科学
薄膜复合膜
反渗透
化学工程
同质性(统计学)
聚合
复合数
纳米尺度
单体
薄膜
纳米复合材料
聚合物
高分子化学
渗透
复合材料
纳米技术
化学
渗透
工程类
统计
生物化学
数学
作者
Liang Shen,Ruihuan Cheng,Ming Yi,Wei‐Song Hung,Susilo Japip,Li Tian,Xuan Zhang,Shu‐Dong Jiang,Song Li,Yan Wang
标识
DOI:10.1038/s41467-022-28183-1
摘要
Abstract Thin-film composite membranes formed by conventional interfacial polymerization generally suffer from the depth heterogeneity of the polyamide layer, i.e., nonuniformly distributed free volume pores, leading to the inefficient permselectivity. Here, we demonstrate a facile and versatile approach to tune the nanoscale homogeneity of polyamide-based thin-film composite membranes via inorganic salt-mediated interfacial polymerization process. Molecular dynamics simulations and various characterization techniques elucidate in detail the underlying molecular mechanism by which the salt addition confines and regulates the diffusion of amine monomers to the water-oil interface and thus tunes the nanoscale homogeneity of the polyamide layer. The resulting thin-film composite membranes with thin, smooth, dense, and structurally homogeneous polyamide layers demonstrate a permeance increment of ~20–435% and/or solute rejection enhancement of ~10–170% as well as improved antifouling property for efficient reverse/forward osmosis and nanofiltration separations. This work sheds light on the tunability of the polyamide layer homogeneity via salt-regulated interfacial polymerization process.
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