A Research On The Preparation And Photocatalytic Proformance Of Fe-doped ZnO And Fe₃O₄/ZnO

ZnO,which has much virtues such as plentiful, low cost,high photocatalytic activity, high stability,non-toxic and pro-environment. In recent years it has attracted much attention on photocatalytic of Zn O. In this paper, the Fe-doped ZnO and Fe₃O₄/ZnO has been prepared by hydrothermal synthesis, The phase composition, surface morphology,microstructure and absorption spectra were characterized by X-ray diffraction?XRD?,scanning electron microscopy?SEM?,and the photocatalysis performance and recoverability have been rerified.?1? The most suitable process conditions of Fe/ZnO were identified: temperature 150?,Fe/Zn=0.05, ethanol adding amount is 20 mL,pH 11. By Orthogonal Experiment Design, we founded that when the Fe/Zn=0.05, the catalyst is 1.1g/L,the pH of the thylene blue is 11,reaction time is 24 h,the thylene blue degradation rate reached 94.1%.?2? The prepared Fe/ZnO nanoparticles were wurtzite structure, the Fe were not uniformly distributed and dispersed on the surface of the ZnO samples,therefore the presence of Fe3+ permeated into the ZnO crystal lattice. The shape of the samples was flake,its thickness was between tens and one hundred nanometer and the dispersibility is very good.?3? When the Zn²⁺ is 0.5mol/L,the Fe₃O₄/ZnO Photocatalysis which we have prepared can degrade the methyl orange,even when the reaction time is 150 min,the degradation rate reached 86%.We also founded that when the Zn²⁺ is 0.5mol/L,dosing quantity is 0.9g/L,UV-irradiation 120 min, the methyl orange is 10mg/l,the Fe₃O₄/ZnO can showed the highest photocatalytic performance, the degradation rate reached 82%.?4? With the increase of the Zn²⁺ concentration, ZnO was distributed on the surface of the Fe₃O₄, the roughness of the samples was increased,then a composite catalyst with magnetite Fe₃O₄ core and ZnO shell can be prepared.?5? By attaching the external magnetic field,the result shows that the Fe₃O₄/ZnOcomposite photocatalyst has a well magnetism,which is contribute to Recycling. The experiment turnes out that average recovery rate can reached 89.6%, which is much higher than the recovery rate of ZnO. At the same time,we also founded that Fe₃O₄/ZnO composite photocatalyst can be reused more than once, In the first three times,it is more effictive,and stable. With its Characteristics of Recycling,it can reduce the cost,and may be contribute to the further Practical applications.