In Situ Decoration of Bi2S3 Nanosheets on Zinc Oxide/Cellulose Acetate Composite Films for Photodegradation of Dyes under Visible Light Irradiation

Abstract

A novel Bi2S3-zinc oxide/cellulose acetate composite film was prepared through a blending-wet phase conversion and in situ precipitate method. The results revealed that the incorporation of Bi2S3 in the film increased the cavity density and uniformity, which provided additional space for the growth of active species and improved the interaction between dye pollutants and active sites. Zinc oxide acted as a mediator to facilitate the separation of electron–hole pairs effectively preventing their recombination, thus reducing the photo-corrosion of Bi2S3. As a result, the Bi2S3-ZnO/CA composite film exhibited favorable photocatalytic activity in the degradation of various dyes. Additionally, the composite film displayed effortless separation and recovery without the need for centrifugation or filtration, while maintaining its exceptional catalytic performance even after undergoing various processes.

Hydrophilicity and Pore Structure Enhancement in Polyurethane/Silk Protein–Bismuth Halide Oxide Composite Films for Photocatalytic Degradation of Dye

“…The superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH) in the photocatalytic reaction system of BiOBr/PU-SF composite film were detected using electron spin resonance (EPR) technology, with DMPO as the capturing agent. In Figure 9 a,b, the presence of four characteristic peaks of •OH and six characteristic peaks of •O 2 − can be observed during visible light irradiation, while no distinct peaks are evident under conditions of no light [ 40 ]. This suggests that the BiOBr/PU-SF composite film is capable of generating •OH and •O 2 − effectively during the photocatalytic process.…”