Construction of triazine-based COF/Zr-based MOF S-scheme heterojunctions for efficient photocatalytic H2O2 production under simulated sunlight irradiation
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The anthraquinone method for commercial hydrogen peroxide (H 2 O 2 ) synthesis is plagued by organic pollution and elevated prices, necessitating the advancement of eco-friendly photocatalytic alternatives. Covalent organic frameworks (COFs) and metal-organic frameworks (MOFs) exhibit potential; yet, they are constrained by inferior charge separation and limited light absorption. Considering triazine-based TFPT-Pa(CH 3 ) 2 -COF has a distinctive Schiff structure and amino-containing Zr-based MOF (e.g., NH 2 -UiO-66) has superior visible light absorption and stability, covalently integrated TFPT-Pa(CH 3 ) 2 /NH 2 -UiO-66 COF/MOF heterojunctions were synthesized by solvothermal methods, and photocatalytic H 2 O 2 production experiments were conducted. The results show that optimum TNU-2 (mass ratio 1:0.5) exhibits a significant H 2 O 2 generation rate of 0.19 mmol g -1 h -1 , which is 3.8-fold and 2.4-fold higher than that of pure TFPT-Pa(CH 3 ) 2 and NH 2 -UiO-66, respectively. Furthermore, TNU-2 demonstrates its remarkable cycle stability after five cycles. The constructed COF/MOF S-scheme heterojunction, which creates an internal electric field to promote charge separation, prevent recombination, and preserve strong redox capabilities, is responsible for the enhanced performance. This work offers a novel method for building efficient COF/MOF-based photocatalysts for the production of H 2 O 2 .
