Study On Photocatalytic Reaction Properties Of LaNi_xB_1-xO₃?B=Fe,Mn? Perovskite

Photocatalytic technology has attracted much attention in the field of dye degradation due to its simple operation,low energy consumption,no secondary pollution,high efficiency.And perovskite is currently the most useful photocatalytic material application.More extensive.Studies have shown that the catalytic properties of the catalytic ruthenium can be improved by replacing the B-site element in the perovskite ABO3 by elements with similar radii.Therefore,for the characteristics of LaFeO3 and LaMnO3 perovskites,LaNixFe1-xO3 and LaNixMni.xO3 catalysts were prepared by replacing Fe and Mn with elemental Ni.The catalytic properties and repeatability of doped perovskites were investigated by degrading dyes.Combined with X-ray diffraction(XRD);scarnning electron microscopy(SEM),specific surface area analysis(BET),and photoelectron spectroscopy(XPS),the composites were explored.Structural properties and catalytic performance of oxides.The specific research is as follows:(1)A series of doped LaNixFe1-xO3(X=0.1,03,0.5,0.7,0.9)perovskite materials were synthesized by sol-gel method to study the degradation of basic fuchsin under xenon lamp conditions.The effect and analysis of its degradation mechanism.It is found that the series of LaNixFe1-xO3 materials have good effects in degrading alkaline fuchsin solution,among which LaNio.9Feo.1O3 has the best catalytic effect,and has a larger specific surface area due to higher doping amount of Ni.There are many active sites,and the surface of the catalyst contains more O-/O2-species of adsorbed oxygen which is beneficial to the degradation of basic fuchsin molecules.The degradation rate can reach 97%.It has stable and efficient recycling efficiency.(2)A series of doped LaNixMni.xO3(X=0.1,0.3,0.5,0.7,0.9)perovskite materials were successfully synthesized by sol-gel method.The structure and properties of Ni content on LaMnO3 perovskite were investigated.The results show that the performance of the catalyst is improved with the increase of Ni content.When X=0.9,the catalytic activity of the doped catalyst is optimal.The reason may be that the introduction of Ni increases the particle dispersibility of the catalyst,increases the surface active oxygen species.Thus has a better degradation effect,and proves that the material has good reusability through repeated use experiments.(3)LaNi0.9Mn0.1O3 supported carbon material catalyst was prepared by mechanical milling method,and its catalytic activity was investigated by degrading neutral red dye.Under the same degradation conditions,the degradation rate of LaNi0.1Mn0.9O3 catalyzed by neutral red was 83%,the degradation rate of LaNi0.1Mn0.9O3/rGO catalyst was 94%,and the degradation rate of LaNi0.1Mn1.9O3/HAC was 97%.It is indicated that the LaNi0.1Mn0.9O3 catalyst supported carbon material can improve the catalytic performance of the material.Probably because the composite material has a larger specific surface area.lt can expose more active sites after loading perovskite,and adsorb more dye moleculeswhich is beneficial to the catalytic reaction.Therefore LaNi0.1Mn0.9O3/rGO and LaNi0.1Mn0.9O3/HAC both exhibited high catalytic activity.