Preparation,Modification And Catalytic Properties Of Metal Oxide Nanofibers

In this paper,the composite nanofibers of noble metal nanoparticles decorated metal oxide nanofibers were prepared by the electrostatic spinning method.The Au nanoparticles were introduced into cerium oxide nanofibers to obtain Au/CeO₂ composite nanofibers with improved catalytic activity due to the surface plasmon resonance?SPR?of Au nanoparticles effect.Then,the Pd/NiO composite nanofibers were synthesized.The structures and properties of the Pd/NiO composite nanofibers were controlled by loading Pd nanoparticles on the nickel oxide nanofibers.The main content of the research are as follows:1.The Au/CeO₂ hybrid nanofibers with different Au loading?0.25 wt.%,0.5 wt.%,1 wt.%,2.5 wt.%?were synchronously fabricated by integrating a facile electrospinning technique and subsequent annealing in air.The particle size and plasmonic absorption of Au nanoparticles?NPs?loaded in the nanofibers were analyzed and found to vary with the dosage of chloroauric acid in the precursor solution.The compositions,microstructures and optical response properties of the Au/CeO₂ hybrid nanofibers were characterized.The Au/CeO₂ hybrid nanofibers were used as photocatalysts for selective oxidation of benzyl alcohol to benzaldehyde with O₂ under simulated sunlight and visible light?>420 nm?,respectively.The results showed that introducing Au NPs into CeO₂ nanofibers induced a great improvement in photocatalysis.The enhancement of catalysis is related to Au load,The photocatalytic performance of Au/CeO₂ hybrid nanofibers was determined by plasmonic absorption,charge transfer,and surface activity.In order to further study the mechanism of photocatalytic oxidation of benzyl alcohol,the transient photocurrent responses of the Au/CeO₂ catalysts were also tested for corroborative evidence.Finally,a possible mechanism for the photocatalytic oxidation of benzyl alcohol occurring at the Au-CeO₂ interface was proposed.2.Pd/NiO hybrid nanofibers with high surface area have been successfully prepared by the electrospinning technique followed with calcination.The catalytic properties were investigated by electrocatalytic oxidation of methanol and the catalytic reduction of nitrophenol with sodium borohydride to aminophenol.For the electrocatalytic oxidation of methanol,the electrocatalytic activity of the as-prepared Pd/NiO composite nanofibers presented a humplike variationin with increasing the loading content of Pd NPs.The Pd/NiO hybrid nanofibers with 0.6 wt.%Pd loading have the highest electrocatalytic activity.Moreover,the as-prepared Pd/NiO composite nanofibers exhibited excellent catalytic activity for the reduction of 4-nitrophenol,2-nitrophenol and 3-nitrophenol by NaBH4 to the corresponding aminophenols.