Preparation And Photocatalytic Performance Of Ag/ZnWO₄/WO₃ Composite Nanofibers

With the rapid development of the social economy and science technology,the energy crisis and environmental problems have gradually become prominent.Photocatalysis technology is an effective means to solve energy crisis and environmental problems.In recent years,semiconductor photocatalytic technology has been widely used in photocatalytic degradation of organic pollutants due to its simple preparation process,clean and non-toxic and no secondary pollution.In this paper,a unique WO3 nanofiber was successfully prepared by simple electrospinning followed annealing.In order to expand the response range of single WO3 nanofibers for sunlight and efficiently promote photogenerated carrier separation,the same method will be used.WO3 forms Ag/WO3 composite nanofiber and Ag/ZnWO4/WO3 composite nanofiber structure with Ag noble metal and ZnWO4 semiconductor.This unique nanofiber structure has its own advantages,such as large specific area,which is beneficial to the absorption of light and the adhesion of dyes.This unique fiber structureand has a large aspect ratio,which facilitates the transport of photogenerated carriers along the longitudinal direction.The composition,phase structure,micromorphology and optical properties of the three samples were characterized by Scanning electron microscopy(SEM),X-ray diffractometry(XRD),energy dispersive X-ray spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),UV-visible diffuse reflectance spectroscopy(UV-Vis-DRS)and photoluminescence spectra(PL).The photocatalytic efficiency of different photocatalysts was compared by studying the degradation of methylene blue(MB)by WO3 nanofibers,Ag/WO3 composite nanofibers and Ag/ZnWO4/WO3 composite nanofibers under ultraviolet visible light irradiation.The results showed that the degradation rate of MB reached 94%by Ag/ZnWO4/WO3 composite nanofibers,which was higher than single WO3 nanofibers(69%)and Ag/WO3(87%)composite nanometers after 80 minutes of photocatalytic degradation under the same conditions.The results show that the higher photocatalytic efficiency of Ag/ZnWO4/WO3 composite nanofibers is attributed to the surface plasmon resonance effect(SPR)of Ag nanoparticles and the effect of bending and one-dimensional nanofiber structure.This research provides new ideas for green catalysts to solve MB pollution problems,and has broad application prospects in other fields.