CeO2@MnO2 with strong Ce-Mn interaction activating PDS to promote in situ degradation of adsorbed tetracycline

A series of CeO2@MnO2 composites was prepared by deposition–precipitation methods. These materials were used to activate sodium persulfate (PDS) for the oxidation of tetracycline. It is found that the composites, especially the CeO2@MnO2-1:4 composites, exhibit better tetracycline removal rates than the pure components. X-ray diffraction (XRD), Raman and scanning electron microscopy (SEM) analyses all indicate that the composite has been successfully prepared with high purity and high crystalline. The XPS analysis shows that the strong interaction between the components promotes the electron transfer. Additionally, the kinetic rate constants of CeO2@MnO2-1:4 after 60 min are 3.8 and 12.7 times higher than pure CeO2 and MnO2, respectively. CeO2@MnO2-1:4 composite also exhibits excellent catalytic activity for individual and hybrid pollutants. The effects of wastewater matrix, pH, circulation and ion strength on the degradation of tetracycline were investigated. It is found that CeO2@MnO2-1:4 composite has good practical application prospects. CeO2@MnO2 composites with synergistic adsorption catalysis can activate PDS and peroxymonosulfate (PMS) for efficient organic catalytic oxidation. This paper provides the theoretical basis and data support for the practical application of the CeO2@MnO2 composite materials.