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

Abstract

The performance of catalytic ability of MFe₂O₄/MoS₂ in the ozonation process was investigated in this work. The synthesized MnFe₂O₄/MoS₂ 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, MnFe₂O₄/MoS₂ 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 MnFe₂O₄/MoS₂ catalytic ozonation were investigated. Five cycle experiments proved that MnFe₂O₄/MoS₂ had good recyclability and stability. MnFe₂O₄/MoS₂ also showed good catalytic performance in the treatment of coal chemical wastewater pesticide wastewater. The MnFe₂O₄ doped with MoS₂ could provide abundant surface active sites for ozone and promote the stable cycle of Mn²⁺/Mn³⁺and Fe²⁺/Fe³⁺, thus generating large amounts of •OH and improving the degradation of phenol by ozonation. The MnFe₂O₄/MoS₂/ozonation treatment system provides a technical reference and theoretical basis for industrial wastewater treatment.