Preparation and application of covalent organic framework photocatalyst for photocatalytic CO2 reduction

By introducing bromine atoms and post-treatment modification into the covalent organic framework photocatalyst, the problems of photogenerated carrier recombination and short excited state lifetime were solved, achieving a highly efficient and selective photocatalytic effect for CO2 reduction to CO.

CN121372525APending Publication Date: 2026-01-23SOUTHWEAT UNIV OF SCI & TECH
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Patent Information

Application Number
CN202511799892.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-02
Publication Date
2026-01-23

AI Technical Summary

Technical Problem

Existing covalent organic framework photocatalysts suffer from rapid recombination of photogenerated carriers and short excited-state lifetimes during photocatalytic carbon dioxide reduction, resulting in low catalytic efficiency.

Method used

By introducing bromine atoms to regulate the electron distribution of the donor-acceptor pair and combining it with post-treatment modification using nano-Fe2O3, sodium citrate, and zinc citrate, a covalent organic framework photocatalyst TzPm-COF-2Br was prepared, which enhanced electron-hole separation and excited-state lifetime.

Benefits of technology

It significantly improved the photocatalytic activity and selectivity of CO2 reduction to CO, with a CO generation rate of 155 μmol g-1h-1 and a selectivity of 99.4%. The catalytic performance remained almost unchanged after 5 cycles, demonstrating excellent cycling stability.

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Abstract

The invention discloses a preparation method of a covalent organic framework photocatalyst for photocatalytic reduction of CO2, which comprises the following steps: adding 4, 4 ', 4' '-(1, 3, 5-triazine-2, 4, 6-triyl) triphenylamine and 2, 5-dibromobenzene-1, 2, 4, 5-tetracarboxylic dianhydride into a reaction kettle, then adding 1-hydroxy-3-methylbenzene and isoquinoline, and uniformly mixing; and carrying out microwave heating on the reaction kettle, cooling to room temperature, filtering, collecting precipitate, washing, and then carrying out Soxhlet extraction and vacuum drying to obtain the covalent organic framework photocatalyst. A surface halogen atom modification strategy is designed and used for regulating and controlling electron distribution and light capture capacity of a donor-acceptor (D-A) in TzPm-COF, and results show that the strategy can effectively improve photocatalytic activity and selectivity of reduction of CO2 into CO, and can be applied to preparation of the TzPm-COF catalyst. A reasonable design strategy is provided for developing a functional modified COFs material for efficiently and selectively photocatalytic CO2 reduction.
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