Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 37, Pages 41942-41949Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11022
Keywords
covalent organic frameworks; homogeneous polymerization; self-standing film; nanofiltration; congo red
Funding
- National Natural Science Foundation of China [21676133, 51872048, U1732155, 51703031]
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Covalent organic frameworks (COFs) are typically isolated as microcrystalline powders. It remains fundamentally challenging to fabricate COFs into high-quality self-standing films to take full advantage of their ordered pore channels for molecular separation. Here, we report a new strategy for fabricating self-standing imine-linked COF films via homogeneous polymerization where films emerge from clear solutions without forming amorphous precipitates. The abundant basic nitrogen atoms of the monomers acted as a reaction controller to realize the homogeneous polymerization and also promoted the tight self-aggregation of COF crystallites to form compact films via H-bonding. The chemically supported self-standing COF films on nylon membranes were also developed via an in situ growth method. The resulting films showed an unprecedentedly ultrafast permeance of 2822 L m(-2) h(-1) MPa-1 with a high rejection rate (99.8%) in the filtration of a congo red (CR) solution, demonstrating the advantage of this new strategy in fabricating high-quality self-standing COF films.
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