Three-dimensional ordered macroporous lanthanum manganate-supported magnetic iron oxide as an efficient catalyst for photo-Fenton degradation of penicillin G potassium

摘要

Abstract Highly efficient visible-light magnetic Fe3O4/3DOM LaMnO3 perovskite catalyst was prepared by sol–gel method and solvothermal method. The Fe3O4/3DOM LaMnO3 was adopted as catalyst to promote the photo-Fenton process, in which Penicillin G potassium (PEN G) was used as representative pollutant. The results showed that the catalyst exhibited excellent photo-Fenton oxidation degradation performances toward PEN G under visible light. Its application on degrading PEN G exhibited highly catalytic efficiency over a wide applicable pH range from 3 to 11. When the PEN G concentration was as low as 5 mg L−1, the PEN G degradation rate still reached 95.31% within 60 min. The catalyst is quiet stable. The significant improvement of the photo-Fenton catalytic activity of Fe3O4/3DOM LaMnO3 is mainly due to the presence of heterogeneous structure, large specific surface area and effective photo-generated carrier separation rate. In addition, the possible catalytic mechanism of Fe3O4/3DOM LaMnO3 was preliminarily proposed by active species capture experiments. In summary, this study provides new insights into the synthesis of an effective heterogeneous photo-Fenton catalyst for the degradation of PEN G in wastewater.Graphical abstract