Study on the Preparation,Characterization and Activity Evaluation of p-n Junction Photocatalyst Co_3O_4/In_2O_3

In this paper,the p-n junction photocatalyst Co3O4/In2O3 was prepared by coprecipitation method and it was characterized by X-ray powder diffraction(XRD).The photocatalytic activity of the photocatalyst Co3O4/In2O3 was evaluated by photocatalytic reduction of Cr2O72-and photocatalytic oxidation of Methyl Orange.The effect of the doped amount of Co3O4,different calcination temperatures and different calcination time on the photocatalytic activity of Co3O4/In2O3 was investigated,respectively.The results showed that the optimum amount of doped Co3O4 was 5 wt.%.The optimum calcination temperature and the optimum calcination time were 300°C and 2h,respectively.The photocatalytic reduction activity and photocatalytic oxidation activity of the p-n junction photocatalyst Co3O4/In2O3 were much higher than that of the pure In2O3 under visible and UV light irradiation.The possible mechanisms of influence on the photocatalytic activity of the p-n junction photocatalyst Co3O4/In2O3 were also discussed.