双助剂修饰WO_3/g-C_3N_4及其光催化性能研究

Study on photocatalytic performance of WO_3/g-C_3N_4 modified by dual auxiliaries

采用光沉积法分别将Ag和MnOx有选择地负载到WO_3/g-C_3N_4复合光催化剂的g-C_3N_4和WO_3表面,制备出双助剂共同改性的Ag-MnOx/WO_3/g-C_3N_4复合光催化剂,通过XRD、TEM、FT-IR、DRS对样品进行表征,考察了Ag-MnOx/WO_3/g-C_3N_4在光催化降解罗丹明B(RhB)溶液的光催化活性。结果表明,Ag沉积在g-C_3N_4表面,MnOx沉积在WO_3表面,有效地促进了光生电子和空穴的分离,在光催化降解测试中,Ag-MnOx/WO_3/g-C_3N_4的降解速率是WO_3/g-C_3N_4的1. 87倍,且比负载单助剂的WO_3/g-C_3N_4NS和浸渍法制备的复合光催化剂降解速率更高。

Ag-MnOx/WO3/g-C3N4 composite photocatalyst that are modified by dual-auxiliaries is prepared via photo-deposition method supporting selectively Ag and MnOxonto the surface of WO3/g-C3N4 NS.The prepared samples are characterized by XRD,TEM,FT-IR and DRS. The photocatalytic activities of Ag-MnOx/WO3/g-C3N4 are evaluated through photocatalytic degrading Rhodamine B.Results indicate that Ag is deposited on the surface of g-C3N4 and MnOx is deposited on the surface of WO3 successfully,which promotes effectively the separation of photogenerated electrons and holes.In the experiment of photocatalytic degradation,the degradation rate over Ag-MnOx/WO3/g-C3N4 NS is 1. 87 times that over WO3/g-C3N4 NS.Ag-MnOx/WO3/g-C3N4 NS derives higher degradation rate than both WO3/g-C3N4 NS that is modified by single auxiliary and the composite photocatalyst prepared by impregnation method.