Ag3PO4量子点修饰Ag3PO4/Bi2WO6异质光催化剂的构筑及其可见响应活性增强机制

采用水热法制备了三维分级球形结构的Bi2WO6,在此基础上采用沉淀-沉积法将Ag3PO4量子点(QDs)沉积在Bi2WO6的表面,成功获得Ag3PO4/Bi2WO6异质复合材料光催化剂。借助XRD、FE-SEM、TEM、UV-Vis-DRS等技术对所得Ag3PO4/Bi2WO6异质复合材料光吸收性能、形貌和组成进行了系统表征,并以次甲基蓝(MB)和苯酚(Ph)的光催化降解为探针反应,探讨了Ag3PO4QDs表面沉积对Bi2WO6光催化性能的影响。结果表明,尺寸约为10nm左右的Ag3PO4QDs均匀的沉积在Bi2WO6的表面,二者形成新颖的Ag3PO4/Bi2WO6异质结构。活性实验结果表明,与纯Bi2WO6相比异质催化剂的活性显著增强,当Ag3PO4与Bi2WO6复合比为1∶1时催化活性最高,其降解Ph的表观速率常数(kapp/min^-1)约为纯Bi2WO6的7倍。

Ag3 PO4 Quantum Dots( QDs) Decoration to Construct Ag3 PO4/Bi2 WO6 Heterogeneous Photocatalyst and Its Enhanced Visible-Light-Driven Photocatalyst Activity

Three-dimensional(3D) hierarchical bismuth tungstate (Bi2WO6) was synthesized via a hydrothermal process. Ag3PO4 quantum dots(QDs) were subsequently deposited on the surface of Bi2WO6 through a precipitation-deposition process. Ag3PO4/Bi2WO6 heterostructure composite was successfully obtained. XRD,FE-SEM,TEM,EDS and UV-Vis-DRS techniques were applied to characterize the phase composition,morphology and light absorptive properties of as-prepared samples. The photodegradation of methylene blue(MB) and phenol (Ph) were employed as probe reaction to investigate the effect of Ag3PO4 QDs deposition on the photocatalytic activity of Bi2WO6. The results reveals that Ag3PO4 QDs with the size of about 10 nm was monodispersed on the surface of Bi2WO6,which resulted in the formation of novel Ag3PO4/Bi2WO6 heterostructure. The photocatalytic activity results indicated that the as-synthesized series Ag3PO4/Bi2WO6 exhibits the enhanced photocataytic activity than that of pure-Bi2WO6. Moreover,when molar ratio of Ag3PO4 and Bi2WO6 equal to 1∶1,the resulted 1∶1 Ag3PO4/Bi2WO6 shows the optimal activity with a apparent rate constant ( kapp/min^-1) as high as seven times of pure-Bi2WO6 for photodegradation of phenol.