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Issue 8, 2020
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Ultrathin fluorinated self-cleaning membranes via coordination-driven metal-bridging assembly for water purification

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Abstract

Amphiphobic fluorine materials hold great promise for fabricating self-cleaning membranes. However, the severely impeded water transport in hydrophobic fluorine-based membranes and the weak interaction with the substrate of the low-surface-energy fluorine materials represent two major obstacles for efficient water purification. Herein, we design an ultrathin fluorine-based membrane via coordination-driven metal-bridging assembly. An Fe3+-rich metal–organic layer is constructed on a porous substrate by coordination between polyphosphate ligands and Fe3+ ions, accompanied by the assembly of perfluorosulfonate polymer ligands (Nafion®) via the bridging effect of Fe3+ ions for the metal-bridging fluorine-based membrane (MBFM). By virtue of the flexible modulation of Fe3+ and unique self-assembly of Nafion®, a defect-free 58 nm-thick MBFM featuring an ultrahigh surface fluorine content (47.6 at%) and underwater superoleophobicity (∼160°) is achieved, which displays a superior water permeance of 125.2 L m−2 h−1 bar−1 (2–10 times higher than that of state-of-the-art membranes with dye rejections above 90%) and versatile resistance towards both spreading and non-spreading foulants (flux decline ratios below 8%). This metal-bridging assembly strategy may shed light on advanced membrane fabrication from rationally designed ligands and functional moieties.

Graphical abstract: Ultrathin fluorinated self-cleaning membranes via coordination-driven metal-bridging assembly for water purification

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Supplementary files

Article information


Submitted
21 Dec 2019
Accepted
07 Feb 2020
First published
07 Feb 2020

J. Mater. Chem. A, 2020,8, 4505-4514
Article type
Paper

Ultrathin fluorinated self-cleaning membranes via coordination-driven metal-bridging assembly for water purification

Q. Yu, X. You, H. Wu, Y. Su, R. Zhang, Y. Liu, C. Yang, J. Shen, J. Yuan and Z. Jiang, J. Mater. Chem. A, 2020, 8, 4505
DOI: 10.1039/C9TA13957E

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