g-C3N4-Ag3PO4/Fe3O4磁性光催化剂的制备及性能研究

Preparation and properties of magnetic g-CN-AgPO/FeO photocatalyst

以光催化降解罗丹明B为探针,考察了反应条件对催化剂性能的影响,并通过XRD、FTIR和UV-Vis-DRS对部分催化剂的结构和光吸收性能进行了表征。结果表明,该催化剂中g-C3N4呈现出类石墨层状结构,Ag3PO4为立方晶相,Fe3O4为立方尖晶石型,Ag3PO4对g-C3N4的复合拓宽了其光谱响应范围,g-C3N4、Ag3PO4和Fe3O4通过分子间作用力复合。光催化降解实验表明,在g-C3N4-Ag3PO4/Fe3O4投加量为0.83 g/L,反应体系pH=7及可见光下反应105 min的条件下,该催化剂对5 mg/L的罗丹明B的降解率高达98.81%。此外,该催化剂还对其它3种染料也表现出良好的光催化降解能力,并且该催化剂可通过磁分离回收,回用稳定性较好。

Rhodamine B dye was used as the target pollutant for degradation,and the effect of reaction conditions on photocatalytic performance was investigated.The structures and optical properties of the as-prepared samples were characterized by XRD,FTIR and UV-Vis-DRS techniques.The results show that in the composite catalyst,g-C3N4 exhibits a typical graphite-like layered structure,Ag3PO4 is a cubic phase and Fe3O4 is a cubic spinel.The Ag3PO4 composite with g-C3N4 broadens the spectral response range of g-C3N4.Ag3PO4 and Fe3O4 have been successfully compounded with g-C3N4 through intermolecular forces.Photocatalytic degradation experiments show that when the dosage of g-C3N4-Ag3PO4/Fe3O4 is 0.83 g/L,the pH value of the solution is 7,and the reaction time is 105 min,the degradation rate of 5 mg/L Rhodamine B can reach up 98.81%under the visible light irradiation.And the catalyst also shows good degradation ability to the other three dyes.Moreover,the catalyst is easily recovered by magnetic separation,and its activity is not greatly reduced after recycling.