CaCO_(3)/Ag_(2)O复合光催化剂降解及抗菌性能研究

Degradation and antibacterial properties of CaCO_(3)/Ag_(2)O composite photocatalyst

为提高CaCO_(3)的使用率,拓展其在处理污染物及抗菌方面的应用,利用沉淀法合成Ag_(2)O及添加CaCO_(3)进一步制备CaCO_(3)/Ag_(2)O光催化剂,通过XRD、XPS、SEM、TEM等对其结构组成、形貌晶格等方面进行表征。实验结果表明,当CaCO_(3)与Ag_(2)O复合比例为1∶1时,在可见光下30 min内对亚甲基蓝降解率可达90%,同时4次循环实验也表明,CaCO_(3)/Ag_(2)O复合光催化剂具有良好的稳定性。光催化剂抗菌试验表明,CaCO_(3)/Ag_(2)O复合光催化剂在30 min内可将金黄色葡萄球菌全部清除。CaCO_(3)负载Ag_(2)O形成异质结,促进了光生电子空穴对的分离,有效提高了复合体系光催化性能。

In order to improve the utilization of CaCO_(3)and expand its application in pollutant treatment and antibacterial,Ag_(2)O was synthesized by precipitation method and CaCO_(3)was added to further prepare CaCO_(3)/Ag_(2)O photocatalyst.The structural composition and morphological lattice were characterized by XRD,XPS,SEM,TEM.The experimental results show that when the molar ratio of CaCO_(3)to Ag_(2)O is 1∶1,the degradation rate of methylene blue can reach 90%within 30 min under visible light.The subsequent four cycle experiments also show that the CaCO_(3)/Ag_(2)O composite photocatalyst has good stability.The antibacterial test of photocatalyst shows that the CaCO_(3)/Ag_(2)O composite photocatalyst can completely eliminate Staphylococcus aureus within 30 min.Ag_(2)O supported by CaCO_(3)forms a heterojunction,which promotes the separation of photogenerated electron-hole pairs and effectively improves the photocatalytic performance of the composite system.