MnFe2O4/MoS2 catalyst used for ozonation: optimization and mechanism analysis of phenolic wastewater treatment

The performance of catalytic ability of MFe 2 O 4 /MoS 2 in the ozonation process was investigated in this work. The synthesized MnFe 2 O 4 /MoS 2 was optimize prepared and then characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photo-electron spectroscopy, and magnetic saturation strength. The results showed that when C phenol  = 200 mg/L, initial pH = 9.0, Q  = 0.10 L/min, and C MnFe2O4/MoS2  = 0.10 g/L, MnFe 2 O 4 /MoS 2 addition improved the degradation efficiency of phenol by 20.0%. The effects of pH, catalyst dosage, and inorganic ions on the phenol removal by the MnFe 2 O 4 /MoS 2 catalytic ozonation were investigated. Five cycle experiments proved that MnFe 2 O 4 /MoS 2 had good recyclability and stability. MnFe 2 O 4 /MoS 2 also showed good catalytic performance in the treatment of coal chemical wastewater pesticide wastewater. The MnFe 2 O 4 doped with MoS 2 could provide abundant surface active sites for ozone and promote the stable cycle of Mn 2+ /Mn 3+ and Fe 2+ /Fe 3+ , thus generating large amounts of •OH and improving the degradation of phenol by ozonation. The MnFe 2 O 4 /MoS 2 /ozonation treatment system provides a technical reference and theoretical basis for industrial wastewater treatment.