Study On The Degradation Of Tetracycline By Graphene Oxide Composite Photocatalytic Materials

The pollution of tetracycline is becoming more and more serious.Photocatalysis is an effective method to control environmental pollution.Graphene oxide(GO),as a hot research material in recent years,has achieved remarkable results in the degradation of pollutants.In this paper,the influence of GO on the photocatalytic activity of these materials was studied through the combination of GO with ultraviolet photocatalyst SnO2,visible light catalyst Bi2MoO6 and Ag3PO4.The best photocatalytic materials for degradation of tetracycline solution were found.(1)Study on the effect of GO on the photocatalytic activity of SnO2 under ultraviolet light.The SnO2/GO composite was prepared by hydrothermal method and ultrasonic method.The pollutants were degraded under ultraviolet light.The data of degradation MO showed that the degradation rate of photocatalyst was about twice that of pure SnO2 when 1.Owt%GO was added.Pure SnO2 and SnO2/1.0wt%GO photocatalysts were used to degrade tetracycline in solution.The results showed that the degradation efficiency of SnO2/1.0wt%GO and SnO2 on tetracycline was low.(2)Study on the effect of GO on the photocatalytic activity of Bi2Mo06 in visible light.The Bi2MoO6/GO materials with different GO contents were prepared by hydrothermal and ultrasonic method.Bi2MoO6/8wt%GO has the optimal photocatalytic activity when the tetracycline solution of 10 mg/L is degraded by visible light irradiation.After the addition of GO,the adsorption capacity of the material for tetracycline was improved.According to the results of EIS spectroscopy,the separation efficiency of photo-induced electron-hole pairs in Bi2Mo06/8wt%GO is higher than that of pure Bi2MoO6 materials.The addition of GO increased the separation efficiency of photo-generated carriers,and enhanced the photocatalytic activity.(3)Study on the effect of GO on the photocatalytic activity of Ag3PO4 in visible light.The Ag3PO4/GO was prepared by hydrothermal method and ultrasonic reaction.After 5 min irradiation of tetracycline(10 mg/L)under visible light,the degradation rate of Ag3PO4/5wt%GO on tetracycline was the highest,as 69.8%.As can be seen from FT-IR spectrum,the characteristic peak strength of GO in Ag3PO4/5wt%GO decreased after photocatalysis.This indicates that some GO has been reduced to rGO in the process.As a photoinduced electron exchange medium,rGO promotes the generation of electron hole pairs.Tetracycline was degraded by Ag3PO4/5wt%GO with capture agents containing different active substances.The results showed that h+and ·O2-determined the high photocatalytic activity of Ag3PO4/5wt%GO during tetracycline degradation.