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Novel Janus Membrane with Unprecedented Osmosis Transport Performance

Abstract

Low energy consumption in water desalination is highly demanded. Herein we show that Janus porous membrane, which comprises superhydrophobic SiO2 coating on superhydrophilic Polyvinylidene fluoride (PVDF) membrane, exhibits unprecedented osmotic water permeability (2.88 L m-2 h-1 bar-1) and near-complete reverse salt rejection (Js/Jw = 0.007 g L-1 ) far beyond the-state-of-art thin film composite (TFC) membranes. The appropriate SiO2 seeding allows the hydrophilic PVDF fibrils to stretch out of the top tip of the microspheres to form a one-way valve, serving as nano-structured water channels while the superhydrophobic side with trapping air functions as active layer to repel the reverse salt diffusion. The hydrophilic microsphere partially covered by F-SiO2 is regarded as a micro-osmosis unit. Both external and internal concentration polarization are well diminished with the superhydrophobic side facing to the draw solution. The intriguing result deepens our understanding in unidirectional mass transfer through Janus nano-channels in fluid osmosis.

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Publication details

The article was received on 03 Sep 2018, accepted on 30 Nov 2018 and first published on 01 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA08541B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Novel Janus Membrane with Unprecedented Osmosis Transport Performance

    S. Zhou, Z. Xiong, F. Liu, H. Lin, J. Wang, T. T. Li, H. Qiu and Q. Fang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08541B

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