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    Dual-layer membrane with hierarchical hydrophobicity and transport channels for nonpolar organic solvent nanofiltration

    Year: 2021

    Journal: AICHE J., Volume 67, APR

    Authors: Fu, Zheng-Jun; Wang, Zhen-Yuan; Liu, Mei-Ling; Cai, Jing; Yuan, Pu-An; Wang, Qian; Xing, Weihong; Sun, Shi-Peng

    Organizations: Fok Ying Tung Education Foundation [171062]; Foundation for Innovative Research Groups of the National Natural Science Foundation of China [21921006]; Jiangsu Provincial Natural Science Fund Outstanding Youth Project [BK20190037]; National Natural Science Foundation of China [21878146]; Priority Academic Program Development of Jiangsu Higher Education Institutions

    Keywords: cocasting; dual-layer membranes; hydrophobicity; nonpolar solvent; organic solvent nanofiltration

    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.
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