Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 25, Pages 13969-13977Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100881
Keywords
aerogels; covalent organic frameworks; functional composites; porous materials; ultralight monolithic aerogels
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Funding
- Spanish MINECO [PID2019-106268GB-C32, MAT2016-77608-C3-1-P, PCI2018-093081, PID2019-108028GB-C21, RTI2018095622-B-I00]
- Catalan AGAUR [2017 SGR 238]
- Basque Government [IT1291-19]
- Mara de Maeztu Programme for Units of Excellence in RD [CEX2018-000805-M]
- CERCA Program/Generalitat de Catalunya
- Severo Ochoa program from the Spanish MINECO [SEV-2017-0706]
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This study presents a simple three-step method to produce COF aerogels with extremely low densities and high porosity. These COF aerogels exhibit excellent adsorption capacity and removal efficiency, while maintaining the micro- and meso-porosity of the constituent COFs.
The use of covalent organic frameworks (COFs) in practical applications demands shaping them into macroscopic objects, which remains challenging. Herein, we report a simple three-step method to produce COF aerogels, based on sol-gel transition, solvent-exchange, and supercritical CO2 drying, in which 2D imine-based COF sheets link together to form hierarchical porous structures. The resultant COF aerogel monoliths have extremely low densities (ca. 0.02 g cm(-3)), high porosity (total porosity values of ca. 99 %), and mechanically behave as elastic materials under a moderate strain (<25-35 %) but become plastic under greater strain. Moreover, these COF aerogels maintain the micro- and meso-porosity of their constituent COFs, and show excellent absorption capacity (e.g. toluene uptake: 32 g g(-1)), with high removal efficiency (ca. 99 %). The same three-step method can be used to create functional composites of these COF aerogels with nanomaterials.
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