可见光光催化剂AgNbO_3:柠檬酸络合法制备及其性能

Visible-Light-Driven Photocatalyst AgNbO_3:Citrate Complex Process Preparation and Photocatalytic Property

以草酸铌铵和硝酸银为反应物,采用柠檬酸络合法成功的制备了钙钛矿型化合物AgNbO3可见光光催化剂,并运用X射线衍射、紫外-可见漫反射、扫描电镜、透射电镜和X射线光电子能谱等手段对催化剂进行了表征。同时以可见光为照射光源,以有机染料亚甲基蓝为模拟探针,考察其光催化性质。结果表明800℃所制备的样品具有最佳的光催化性能,其主要降解途径是以脱甲基的形式进行的,与固相法合成的样品相比,柠檬酸络合法所制备的样品具有较好的光催化性能。

AgNbO3 particles with a perovskite-type structure were successfully synthesized via a citrate complex method from NH4H2[NbO（C2O4）3·3H2O] and AgNO3.The obtained samples were characterized by XRD,DRS,SEM,TEM and XPS.The photocatalytic activity was tested by the decomposition of organic dye methylene blue under visible light irradiation.The results showed that the sample prepared at 800 ℃ exhibited the best photocatalytic activity.And the decomposition of methylene blue is via a demethylation process.Compared to the sample prepared by the solid-state reaction,the sample prepared by citrate complex method displayed a higher photocatalytic activity.