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Air-Steam Etched Construction of Hierarchically Porous Metal-Organic Frameworks
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  • Hongliang Huang,
  • Yuxiu Sun,
  • Xuemeng Jia,
  • Wenjuan Xue,
  • Chenxu Geng,
  • Xin Zhao,
  • Donghai Mei,
  • Chongli Zhong
Hongliang Huang
Tiangong University
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Yuxiu Sun
Tiangong University
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Xuemeng Jia
Tiangong University
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Wenjuan Xue
Tiangong University
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Chenxu Geng
Tiangong University
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Xin Zhao
Tiangong University
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Donghai Mei
Tiangong University
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Chongli Zhong
Tiangong University
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Abstract

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. 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.

Peer review status:Published

09 May 2021Published in Chinese Journal of Chemistry. 10.1002/cjoc.202000718