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

Abstract

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.