Construction of Se@TiO₂ nanostructures on polyester surface and investigation of the photocatalytic and antibacterial properties

Surface pretreatment of polyester fabric was carried out using plasma technology. Nano-TiO₂ was loaded on the surface of the polyester fabric, and then Se nanospheres (SeNPs) and Se nanowires (SeNWs) were grown on the surface of the TiO₂/ Polyethylene terephthalate (PET) through molecular assembly method. Se@TiO₂ binary composite structure was constructed on the surface of the PET(SeNPs@TiO₂/PET and SeNWs@TiO₂/PET). The crystal structure, surface morphology, chemical composition, photocatalytic and antibacterial properties of the material were characterized by SEM, XRD, XPS, UV vis, PL, and photocatalytic and antibacterial experiments. Characterize the wetting performance of composite photocatalytic materials through contact angle testing. The results indicate that SeNPs@TiO₂/PET and SeNWs@TiO₂/PET composite photocatalytic materials have been successfully prepared. The photocatalytic degradation experiment shows that SeNWs@TiO₂/PET has a higher degradation rate under sunlight simulation. After 90 minutes of degradation of the model pollutant methylene blue, the degradation rate reached 98.3%. PL spectrum indicates SeNWs@TiO₂/PET separation rate of electron hole pairs is higher than SeNPs@TiO₂/PET. The UV-vis spectrum indicates that relative bandgap widths of SeNPs@TiO₂/PET and SeNWs@TiO₂/PET are 2.8 eV and 2.7 eV, respectively. The antibacterial rates of composite materials against S.aureus and E.coli can reach over 99% and 90%, respectively.