Three-dimensional covalent organic frameworks with nia nets for efficient separation of benzene/cyclohexane mixtures

Jianhong Chang, Fengqian Chen, Hui Li (), Jinquan Suo, Haorui Zheng, Jie Zhang, Zitao Wang, Liangkui Zhu, Valentin Valtchev, Shilun Qiu and Qianrong Fang ()
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Jianhong Chang: Jilin University
Fengqian Chen: Jilin University
Hui Li: Jilin University
Jinquan Suo: Jilin University
Haorui Zheng: Jilin University
Jie Zhang: Jilin University
Zitao Wang: Jilin University
Liangkui Zhu: Jilin University
Valentin Valtchev: Chinese Academy of Sciences
Shilun Qiu: Jilin University
Qianrong Fang: Jilin University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The synthesis of three-dimensional covalent organic frameworks with highly connected building blocks presents a significant challenge. In this study, we report two 3D COFs with the nia topology, named JUC-641 and JUC-642, by introducing planar hexagonal and triangular prism nodes. Notably, our adsorption studies and breakthrough experiments reveal that both COFs exhibit exceptional separation capabilities, surpassing previously reported 3D COFs and most porous organic polymers, with a separation factor of up to 2.02 for benzene and cyclohexane. Additionally, dispersion-corrected density functional theory analysis suggests that the good performance of these 3D COFs can be attributed to the incorporation of highly aromatic building blocks and the presence of extensive pore structures. Consequently, this research not only expands the diversity of COFs but also highlights the potential of functional COF materials as promising candidates for environmentally-friendly separation applications.

Date: 2024
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DOI: 10.1038/s41467-024-45005-8

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