Journal
ACS CATALYSIS
Volume 10, Issue 12, Pages 6664-6675Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c00290
Keywords
visible light; anthraquinone; covalent organic frameworks; heterogeneous photocatalysis; metal-free oxidation
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Funding
- National Natural Science Foundation of China [21908038, 21676068]
- Natural Science Foundation of Hebei Province [B2018201118, B2019201341]
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Visible-light-responsive covalent organic frameworks (COFs) as photocatalysts for metal-free organic reactions are highly desirable due to their structural controllability and molecular functionality. In this study, we describe the fabrication of an anthraquinone functionalized COF linked by beta-ketoenamines (AQ-COF), which presents a noodle-like nanofiber structure with staggered AB stacking mode. The as-resultant AQ-COF was efficiently utilized as a metal-free heterogeneous catalyst for selective aerobic oxidation of sulfides under visible-light irradiation. Compared with the precedential AQ-COFDMF with spherical particles, the proposed AQ-COF presents a higher photocatalytic activity with high selectivity to sulfoxides and chemical stability. Further characterization techniques revealed that the unique morphology and structure can greatly enhance charge transfer and separation efficiency of photogenerated electron-hole pairs, thus giving rise to the improvement of photocatalytic activity.
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