4.8 Review

Covalent Organic Frameworks for Extracting Water from Air

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Summary: The pore environment and aggregated structure of porous materials are crucial for their properties, especially mass transfer. In this study, a COF-to-COF transformation method was used to prepare microtubular COFs. This transformation was achieved by decomposing C-3-symmetric guanidine units into C-2-symmetric hydrazine units, resulting in crystal transformation of COFs. The hierarchical structure obtained with varying reaction times led to enhanced mass transfer properties, as demonstrated by adsorption measurement and chemical catalytic reactions. This self-template strategy was also successfully applied to four other COFs with different building units.

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Summary: Atmospheric water harvesting using metal-organic frameworks (MOFs) is an attractive method for alleviating water shortage stress in arid regions. Researchers have developed a cylindrical structure by embedding commercial carbon fibers into MOF monoliths, resulting in improved heating efficiency for efficient water sorption and release.

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Summary: We report a postsynthetic strategy and its implementation to make covalent organic frameworks with irreversible hydrazide linkages. The synthesis of three 2D and 3D hydrazine-linked frameworks and their partial oxidation were performed. The water uptake profiles of these frameworks were studied, leading to the discovery of one hydrazine-hydrazide linked COF suitable for water harvesting from air in arid conditions.

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