Ag_3PO_4光催化剂的合成和其光催化性能

Synthesis and Photocatalytic Activity of Ag_3PO_4 Photocatalyst

用简单化学沉淀法制备了Ag3PO4可见光光催化剂,通过XRD、SEM和UV-Vis对其进行表征,并以若丹明B溶液为目标降解物研究了其光催化性能。UV-Vis图证实Ag3PO4对波长小于525nm范围内有明显吸收,可利用太阳光中的可见光。对比在可见光下光降解45min时的催化性能,N-TiO2催化降解率为8.1%,而Ag3PO4催化降解率为93.9%,表明Ag3PO4具有高效性;重复光催化5次Ag3PO4催化性能基本保持不变,催化降解率依次为93.9%、95.4%、95.5%、95.9%和96.5%,SEM图和XRD图显示,立方晶系的Ag3PO4在重复光催化5次后形貌和晶型均没有发生变化,以上实验结果表明其具有稳定性。因此,Ag3PO4是一种具有高效性和稳定性的可见光催化剂。

The Ag3PO4 photocatalyst was prepared by the precipitation method,and then,XRD,SEM and UV-vis were used to characterize the photocatalyst.The solution of rhodamine B,was selected as the degradation object in the study of its photocatalytic activity.The graph of UV-Vis approved that Ag3PO4 had obviously absorption of visible light at the range of 400-525 nm.Compared with N-TiO2,s rate of degradation 8.1%,that of Ag3PO4 was 93.9% in the photodegradation experiments of 45 minutes with the solution of rhodamine B under irradiation,which was of high efficiency.It also had high efficiency after 5 times photocatalyzed,and the graphs of XRD and SEM indicateed that,Ag3PO4,which was of cubic structure type,had no changes after 5 times photocatalyzed,and all these results above showed that Ag3PO4 was of stability.Therefore,Ag3PO4 was a kind visible-light photocatalyst of high efficiency and stability.