A Research On The Photocatalytic Properties Of Fe-Doped ZnO Nanofibers

In recent years,with the continuous development of human industry,the global environment has deteriorated.Therefore,a photocatalytic technology using metal oxide as a catalyst has been widely concerned and studied for its ability to effectively degrade pollutants and green the environment.As a typical II-VI direct band wide bandgap semiconductor material,ZnO is one of the most widely studied photocatalysts.However,the absorption wavelength of pure ZnO is 368 nm,the light absorption is limited to the ultraviolet region,and the recombination rate of photogenerated electron-hole pairs is high,and the photocatalytic performance is not prominent.These two factors are the main factors limiting the photocatalytic efficiency of ZnO.However,studies have shown that the performance of ZnO photocatalysts can be significantly improved by transition metal ion doping.In this paper,the Fe-doped ZnO nanofibers were prepared by a combination of sol-gel and electrospinning,and their photocatalytic properties were studied.Influencing factors of the viscosity of the precursor fluid and the surface shape of the Fe-doped ZnO nanofibers by means of Brookfield viscometer,scanning electron microscope(SEM),X-ray diffraction(XRD),ultraviolet-visible spectrophotometer,photoluminescence spectrometer and other characterization methods The appearance,microstructure,phase,absorption spectrum,photoluminescence spectrum,intrinsic band gap energy level and other characteristics were analyzed in detail.The main results obtained in this study are as follows:(1)Under the premise of constant concentration and temperature,the viscosity of the spinning precursor liquid will decrease with the increase of Fe doping-ratio,thus affecting the diameter of the spun fiber;Fe-doped ZnO nanofibers have been successfully maintained.The structure of pure ZnO nanofibers,the diameter of nanofibers will decrease with the increase of nominal Fe doping ratio.(2)After Fe doping,the characteristic peak positions of ZnO are uniformly shifted to a large angle,which proves that Fe3+ does diffuse into the lattice of ZnO.At 447?,1.5%Fe nominally doped ZnO peak position shift is the largest;The higher the fiber sintering temperature,the higher the actual doping amount of Fe under the same nominal Fe doping amount;the higher the nominal Fe doping amount and the actual Fe content when the sintering temperature is high enough and the supplied energy is sufficient.The amount of doping is larger.(3)The one-dimensional structure of Fe-doped ZnO nanofibers has a large specific surface area,and its photocatalytic performance is better than that of precursor sintered products.The different Fe doping ratios of nanofibers and precursors are 1.5%Fe.It has the best photocatalytic performance under the nominal doping ratio;the Fe-doping reduces the electron-hole recombination efficiency of ZnO,and thus improves the photocatalytic performance;When iron ions are doped in ZnO fibers,the intrinsic band gap energy of ZnO is also narrowed,thereby improving its photocatalytic activity.