Polydopamine-modulated covalent organic framework membranes for molecular separation

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 polydopamin...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (3), p.1863-1871
Main Authors: Shen, Jianliang, Zhang, Runnan, Su, Yanlei, Shi, Benbing, You, Xinda, Guo, Weixiong, Ma, Yu, Yuan, Jinqiu, Wang, Fei, Jiang, Zhongyi
Format: Article
Language:English
Subjects:
Chemical synthesis
Fabrication
Imines
Membranes
Monomers
Nucleation
Polyacrylonitrile
Porous materials
Rejection
Water transport
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Summary: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. Ultrathin and defect-free sulfonated imine-linked COF membranes were fabricated on a porous support via a polydopamine (PDA)-modulated bottom-up approach for molecular separation.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta05040j