水热法合成了Bi2WO6催化剂后,将Ag-Ag2O负载在Bi2WO6上,制备出新型Ag-Ag2O/Bi2WO6异质结光催化剂,通过XRD,SEM,TEM,UV-Vis DRS 等一系列测试手段对光催化剂进行了形貌、结构、吸光性能等性质的表征,并以罗丹明B(Rh B)为目标污染物研究催化剂的光催化活性.结果表明制备的Ag-Ag2O/Bi2WO6异质结光催化剂主体为立体花球状结构,直径约2 μm,具有较大的比表面积,且对可见光的吸收范围有明显增加(从442红移至594 nm),催化活性亦高于未负载的Bi2WO6,反应120 min后,Ag-Ag2O/Bi2WO6对罗丹明B(Rh B)的降解率可达96.20%,在重复4次降解实验之后,其光催化活性虽然有一定损失,但光催化性能仍优于其余两组催化剂.
Bismuth tungstate (Bi2WO6) microcrystalline prepared by a facile hydrothermal method was used to fabricate a new kind of Ag-Ag2O/Bi2WO6 heterojunction catalyst.The structures and morphologies of Ag-Ag2O/Bi2WO6 heterojunction catalysts were characterized by XRD, SEM, TEM and UV-Vis DRS.Photocatalytic performances of Ag-Ag2O/Bi2WO6 were comparatively evaluated from measuring the degradation efficiency of Rhodamine B (RhB) aqueous solution.The results revealed that Ag-Ag2O/Bi2WO6 heterojunction catalyst kept a 3D flower-like structure with the average size of 2 μm and had larger specific surface area as well.The degradation efficiency of Rh B had reached 96.2% in 120 min and the catalyst exhibited some loss of activity after 4 cycles, but still had the best photocatalytic performance.
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