BiOBr/g-C₃N₄ Photocatalytic Antibacterial Paper and Application in Fruit Preservation

To further improve the antibacterial performance of photocatalytic paper, a BiOBr/g-C₃N₄ photocatalyst was synthesized via a two-step method, involving calcination for g-C₃N₄ preparation followed by a solvothermal process for BiOBr/g-C₃N₄ composite formation. The BiOBr/g-C₃N₄ photocatalytic paper was fabricated by loading sunflower stalk pulp with a self-made hot-pressing device. In the composite, BiOBr and g-C₃N₄ form tight heterojunctions through close contact, facilitating efficient charge separation and enhancing visible-light utilization. The resulting photocatalytic paper exhibits excellent recyclability and strong antibacterial activity, achieving 99.99% antibacterial efficiency and extending the fruit preservation time by fourfold compared with the control group. This study provides a green and scalable approach for developing recyclable and biodegradable photocatalytic packaging materials with potential applications in sustainable food preservation.