Degradation and antibacterial properties of CaCO3/Ag2O composite photocatalyst
In order to improve the utilization of CaCO3 and expand its application in pollutant treatment and antibacterial,Ag2O was synthesized by precipitation method and CaCO3 was added to further prepare CaCO3/Ag2O photocatalyst.The structural composi-tion and morphological lattice were characterized by XRD,XPS,SEM,TEM.The experimental results show that when the molar ra-tio of CaCO3 to Ag2O is 1∶1,the degradation rate of methylene blue can reach 90％within 30 min under visible light.The subse-quent four cycle experiments also show that the CaCO3/Ag2O composite photocatalyst has good stability.The antibacterial test of photocatalyst shows that the CaCO3/Ag2O composite photocatalyst can completely eliminate Staphylococcus aureus within 30 min.Ag2O supported by CaCO3 forms a heterojunction,which promotes the separation of photogenerated electron-hole pairs and effec-tively improves the photocatalytic performance of the composite system.
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