Preparation Of Ferrite Photocatalysts And Its Performance In Degradation Of Methyl Orange Under Visible Light

Environmental pollution is a major problems that our society need to face at present.The photocatalytic technology can use solar energy to degrade pollutants and photocatalysts play a great role on the photocatalytic technology.However,as a traditional catalyst,the band gap of TiO2 is 3.2 eV.TiO2 can only use ultraviolet light which make up 4% of the solar spectrum,that limits the utilization of solar energy.Because spinel ferrite have a narrow band gap?about 2 eV?and strong corrosion resistance,it is considered as a promising photocatalyst.Therefore,developing the novel photocatalyst with visible light activity is an important subject for further study.In this research,to solve the defect of the traditional photocatalyst,several different nanostructured ferrite materials were prepared in different synthetic conditions,microstructure control and the construction of complex ferrite system.The photocatalytic activity of the catalyst in visible light were studied by the degradation of methyl orange under visible light irradiation.The main results are as follows:?1?The octahedral rGO/MgFe₂O₄?rGO:Reduced graphene oxide?nanomaterial which has visible light catalytic degradation activity are prepared successfully.Under the radiation of visible light for 1 h,63.45% methyl orange are degraded and it increased 10.37% compared to the pure MgFe₂O₄.The material loaded with GO?graphene oxide?can improve the photocatalytic activity of the catalytic and the main reason is the combination of GO and MgFe₂O₄ increase the separation efficiency of photo electron and the adsorption performance to the methyl orange because of the doped of GO.?2?Under the condition of different synthesis methods,a series of MgFe₂O₄ materials are prepared,which contain two different shapes: nanosphere and hollow nanosphere which have visible light catalytic degradation activity.Methyl orange can be degraded thoroughly after under the radiation of visible light for 3 h.Using the similar synthetic condition of hollow nanophere,ions doped hollow nanosphere Mgn Zn1-nFe2O4 are prepared.These materials all have visible light activity.After being exposured under visible light for 1 h,the degradation efficiency of MgFe₂O₄ hollow sphere is 54.37%,which is the best.?3?The photocatalytic activity under the radiation of visible light of methyl orange by the above ferrite catalysts were prepared: the nano-octahedral rGO/MgFe₂O₄>the MgnZn1-nFe2O4 hollow sphere > the MgFe₂O₄ nanosphereIn this study,a batch of visible light responsive catalysts have been constructed,and improve the degradation rate of methyl orange.