Covalent organic framework membranes through a mixed-dimensional assembly for molecular separations

Hao Yang, Leixin Yang, Hongjian Wang, Ziang Xu, Yumeng Zhao, Yi Luo, Nayab Nasir, Yimeng Song, Hong Wu (), Fusheng Pan () and Zhongyi Jiang ()
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Hao Yang: Tianjin University
Leixin Yang: Tianjin University
Hongjian Wang: Tianjin University
Ziang Xu: Tianjin University
Yumeng Zhao: Tianjin University
Yi Luo: Tianjin University
Nayab Nasir: Tianjin University
Yimeng Song: Tianjin University
Hong Wu: Tianjin University
Fusheng Pan: Tianjin University
Zhongyi Jiang: Tianjin University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Covalent organic frameworks (COFs) hold great promise in molecular separations owing to their robust, ordered and tunable porous network structures. Currently, the pore size of COFs is usually much larger than most small molecules. Meanwhile, the weak interlamellar interaction between COF nanosheets impedes the preparation of defect-free membranes. Herein, we report a series of COF membranes through a mixed-dimensional assembly of 2D COF nanosheets and 1D cellulose nanofibers (CNFs). The pore size of 0.45–1.0 nm is acquired from the sheltering effect of CNFs, rendering membranes precise molecular sieving ability, besides the multiple interactions between COFs and CNFs elevate membrane stability. Accordingly, the membranes exhibit a flux of 8.53 kg m−2 h−1 with a separation factor of 3876 for n-butanol dehydration, and high permeance of 42.8 L m−2 h−1 bar−1 with a rejection of 96.8% for Na2SO4 removal. Our mixed-dimensional design may inspire the fabrication and application of COF membranes.

Date: 2019
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DOI: 10.1038/s41467-019-10157-5

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