RGO membrane supported Co3O4 activated potassium peroxymonosulfate for RhB degradation
An efficient RGO/Co3O4 composite catalyst was prepared by hydrothermal method with RGO(reduced graphene oxide)membrane as support.The crystal structure,morphology and chemical composition of composite catalyst were characterized by XRD,SEM and XPS.RhB(Rhodamine B)degradation was employed as a model test for evaluating PMS(potassium peroxymonosulfate)activation.The effects of PMS mass concentration,RhB initial mass concentration,pH and temperature on the degradation of RhB by composite catalyst activated PMS were investigated.The results show the degradation rate of RhB is 98％after 18 min reaction at PMS mass concentration of 100 mg/L,RhB initial mass concentration of 10 mg/L,pH of 7,and 25 ℃.Free radical capture experiment combined with ESR identification confirms that SO4-·and HO·both exist in the system and contributes to RhB degradation.After five cycles,the degradation rate of RhB still maintains above 90％with RGO/Co3O4 catalyst,showing excellent cycling stability.
万方数据
