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Air‐Steam Etched Construction of Hierarchically Porous Metal‐Organic Frameworks
Author(s) -
Huang Hongliang,
Sun Yuxiu,
Jia Xuemeng,
Xue Wenjuan,
Geng Chenxu,
Zhao Xin,
Mei Donghai,
Zhong Chongli
Publication year - 2021
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.202000718
Subject(s) - microporous material , chemistry , metal organic framework , mesoporous material , porosity , chemical engineering , protonation , moiety , imidazole , zeolitic imidazolate framework , crystallinity , imidazolate , etching (microfabrication) , nanotechnology , inorganic chemistry , organic chemistry , adsorption , catalysis , materials science , crystallography , ion , layer (electronics) , engineering
Main observation and conclusion The introduction of mesoporosity into the microporous metal‐organic frameworks (MOFs) is expected to expand their applications. Herein, we report a green and facile method to obtain hierarchically porous MOF structures by using an air‐steam etching process. By virtue of the protonation reaction between the imidazole moiety and water vapor, the protonated imidazole related linkers leave the framework, resulting in the formation of mesopores in the zeolitic imidazolate frameworks (ZIFs), as exemplified by ZIF‐8. Given the mild etching process, the materials’ structural integrity and crystallinity are well maintained. Accordingly, the hierarchical porous ZIF‐8 exhibited enhanced performance in the dye removal as well as CO 2 cycloaddition reaction with epichlorohydrin in comparison with microporous ZIF‐8, owing to the accelerated mass transfer arising from mesoporous structures. Remarkably, the proposed steam etching approach is generally applicable, which can be readily extended to other ZIFs, such as ZIF‐14, ZIF‐69, and ZIF‐71, thus representing a powerful strategy to construct hierarchically porous MOF materials.