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Dual‐layer membrane with hierarchical hydrophobicity and transport channels for nonpolar organic solvent nanofiltration
Author(s) -
Fu ZhengJun,
Wang ZhenYuan,
Liu MeiLing,
Cai Jing,
Yuan PuAn,
Wang Qian,
Xing Weihong,
Sun ShiPeng
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17138
Subject(s) - nanofiltration , membrane , permeance , solvent , chemical engineering , chemistry , layer (electronics) , polyurea , chromatography , organic chemistry , permeation , biochemistry , engineering , coating
Nonpolar solvent separation is widely used in petroleum, chemical, food industries, but traditional separation methods consume intensive energy. State‐of‐art organic solvent nanofiltration membranes require complex modifications for nonpolar solvent transport. For the first time, we propose the concurrent modification of the surface, interface and support layer of dual‐layer membranes with three additives (perfluorodecylamine, fluoro substituted aromatic amine, silica nanoparticles) in a one‐step cocasting process. A delamination‐free dual‐layer membrane was obtained with a hierarchical hydrophobicity and transport channels. The novel designed structure elevated the pure n‐hexane permeance (28.75 L m −2 hr −1 bar −1 ) by 3 orders of magnitude with a high lecithin rejection (98.7%). This method of synergistically controlling the hierarchical structures and properties of dual‐layer membranes can significantly shorten the preparation process of high‐performance nonpolar solvent nanofiltration membranes.