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Issue 30, 2019
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Polydopamine-modulated covalent organic framework membranes for molecular separation

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Abstract

Covalent organic frameworks (COFs) are emerging porous crystalline materials with regular and permanent channels for constructing high-performance molecular sieving membranes. However, fabrication of COF membranes on porous supports in a facile manner remains a great challenge. Herein, a polydopamine (PDA)-modulated bottom-up approach was proposed to fabricate an ultrathin sulfonated imine-linked COF layer (SCOF, synthesized by Schiff-base reaction of 1,3,5-triformylphloroglucinol with 2,5-diaminobenzenesulfonic acid) on a polyacrylonitrile (PAN) support. The PDA layer deposited on the support acted as a molecular linker that attracted and bound COF building monomers, thus facilitating SCOF nucleation and growth of a defect-free SCOF layer. An optimized PDA deposition time of 1 hour provides sufficient adsorption sites for COF monomers without introducing additional water transport resistance. The resultant SCOF/PDA/PAN membrane shows an excellent water permeance of up to 1346 L m−2 h−1 MPa−1 with desirable dye rejection (e.g., Eriochrome black T and Congo red, >99.0%), which is nearly 7–12 times higher than that of most membranes with comparable rejection in the literature. This facile and universal PDA-modulated approach can be extended to a broad range of COF membranes and many other kinds of framework-based membranes.

Graphical abstract: Polydopamine-modulated covalent organic framework membranes for molecular separation

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Supplementary files

Article information


Submitted
14 May 2019
Accepted
03 Jul 2019
First published
04 Jul 2019

J. Mater. Chem. A, 2019,7, 18063-18071
Article type
Paper

Polydopamine-modulated covalent organic framework membranes for molecular separation

J. Shen, R. Zhang, Y. Su, B. Shi, X. You, W. Guo, Y. Ma, J. Yuan, F. Wang and Z. Jiang, J. Mater. Chem. A, 2019, 7, 18063
DOI: 10.1039/C9TA05040J

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