Covalent organic framework membranes for efficient separation of monovalent cations

Hongjian Wang, Yeming Zhai, Yang Li, Yu Cao, Benbing Shi, Runlai Li, Zingting Zhu, Haifei Jiang, Zheyuan Guo, Meidi Wang, Long Chen, Yawei Liu, Kai-Ge Zhou, Fusheng Pan () and Zhongyi Jiang ()
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Hongjian Wang: Tianjin University
Yeming Zhai: Tianjin University
Yang Li: Tianjin University
Yu Cao: Tianjin University
Benbing Shi: Tianjin University
Runlai Li: National University of Singapore
Zingting Zhu: Tianjin University
Haifei Jiang: Tianjin University
Zheyuan Guo: Tianjin University
Meidi Wang: Tianjin University
Long Chen: Jilin University
Yawei Liu: Chinese Academy of Sciences
Kai-Ge Zhou: Tianjin University
Fusheng Pan: Tianjin University
Zhongyi Jiang: Tianjin University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Covalent organic frameworks (COF), with rigid, highly ordered and tunable structures, can actively manipulate the synergy of entropic selectivity and enthalpic selectivity, holding great potential as next-generation membrane materials for ion separations. Here, we demonstrated the efficient separation of monovalent cations by COF membrane. The channels of COF membrane are decorated with three different kinds of acid groups. A concept of confined cascade separation was proposed to elucidate the separation process. The channels of COF membrane comprised two kinds of domains, acid-domains and acid-free-domains. The acid-domains serve as confined stages, rendering high selectivity, while the acid-free-domains preserve the pristine channel size, rendering high permeation flux. A set of descriptors of stage properties were designed to elucidate their effect on selective ion transport behavior. The resulting COF membrane acquired high ion separation performances, with an actual selectivity of 4.2–4.7 for K+/Li+ binary mixtures and an ideal selectivity of ~13.7 for K+/Li+.

Date: 2022
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DOI: 10.1038/s41467-022-34849-7

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