S-Scheme Heterojunction Based on Resorcinol-Formaldehyde Resin Nanosheets and Bi-Based Metal-Organic Frameworks for Efficient Photocatalytic H2O2 Production

At present, photocatalytic hydrogen peroxide (H2O2) production has been widely concerned, and it is a great challenge to design and develop a photocatalyst for efficient production of H2O2 for rational utilization of solar energy. In this work, the RF/Bi/Bi-MOF nanostructure catalyst was prepared with the method of two-step synthesis. Bi-MOF nanorods were synthesized via a solvothermal method, and then resorcinol and formaldehyde were polymerized into resorcinol-formaldehyde resin nanosheets around the Bi-MOF nanorods. At the same time, bits of Bi3+ were reduced to Bi-metal. The RF/Bi/Bi-MOF significantly improved the production efficiency of photocatalytic H2O2. Specifically, RF/Bi/Bi-MOF-0.3 demonstrated significantly improved photocatalytic H2O2 production capabilities, achieving a flow rate of 1787.17 mu mol/g/h under simulated solar illumination. This performance is 38.59 times higher than pure Bi-MOF and 3.01 times higher than pure RF. Through analytical characterization, the S-scheme mechanism of the heterojunction has been verified. The S-scheme heterojunction promotes the rapid transfer of electrons and improves charge separation. This study offers fresh perspectives on the design and synthesis of innovative Bi-MOF/organic polymer semiconductor heterojunction photocatalysts.