Dual-Layer Membrane With Hierarchical Hydrophobicity And Transport Channels For Nonpolar Organic Solvent Nanofiltration

AICHE JOURNAL(2021)

Cited 17|Views5
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Abstract
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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Key words
cocasting, dual-layer membranes, hydrophobicity, nonpolar solvent, organic solvent nanofiltration
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