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Research Article

Two flexible cationic metal-organic frameworks with remarkable stability for CO2/CH4 separation

Shulin Li1, Shilin Zeng1, Yuyang Tian1, Xiaofei Jing1( ), Fuxing Sun2( ), Guangshan Zhu1
Key Laboratory of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, China
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China
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Abstract

Cationic azole-based metal-organic frameworks (MOFs) with remarkable stability and unique pore environment have aroused great research interests. Meanwhile, flexible MOFs which can undergo pore-structure changes upon exposure to external stimuli are ideal materials for gas separation. However, introducing flexibility into the framework of cationic azole-based MOFs is rarely reported. Herein, we synthesized two stable isomorphic cationic MOFs (M-btz-as, M = Co, Ni) based on a linear azole ligand. After activated at high temperature under vacuum, M-btz-ht (M = Co, Ni) were obtained and both MOFs exhibited flexible features in which Co-btz is more flexible than Ni-btz. Different solvent-mediated activation methods were employed to explore their effects on structural flexibility and produced MOFs with different phases. Continuous phase transformation of Co-btz-e was verified by powder X-ray diffraction. In addition, these MOF phases possessed different gas separation abilities affected by their flexible frameworks, and Co-btz-ht exhibited the highest CO2/CH4 separation ability.

Keywords

metal-organic frameworks (MOFs)cationic MOFsflexibilitygas adsorptioncarbon dioxide

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Nano Research
Volume 14 Issue 9,
September 2021
Pages 3288-3293
DOI: 10.1007/s12274-021-3329-8
Cite this article:
Li S, Zeng S, Tian Y, et al. Two flexible cationic metal-organic frameworks with remarkable stability for CO2/CH4 separation. Nano Research, 2021, 14(9): 3288-3293. https://doi.org/10.1007/s12274-021-3329-8
Topics:
Carbon dioxideMetalsOrganic frameworks OrganometallicsPore structure
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Seventh Nano Research Award

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Received: 24 November 2020
Revised: 10 January 2021
Accepted: 12 January 2021
Published: 05 February 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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