Synergistic mechanism of supported Mn–Ce oxide in catalytic ozonation of nitrofurazone wastewater

In this study, the catalytic materials of MnO x /γ-Al 2 O 3 , CeO 2 /γ-Al 2 O 3 , and Mn x Ce 1-x O 2 /γ-Al 2 O 3 for catalytic ozonation were synthesized. The catalysts were used in heterogeneous catalytic ozonation of the wastewater containing ntrofurazone (NFZ). The effects of the catalytic ozonation operational factors were systematically evaluated in terms of ozone dosing, catalyst dosing, initial NFZ concentration, and pH. The results showed that the catalytic activity of the Mn x Ce 1-x O 2 /γ-Al 2 O 3 was higher than that of the MnO x /γ-Al 2 O 3 and CeO 2 /γ-Al 2 O 3 . The kinetics analysis revealed that bimetallic loading has a synergistic effect and the mechanism of this effect was investigated in the catalytic ozonation system. The catalysts were characterized by FESEM, EDS, XRD, XPS, IR , and BET. The characteristics of the catalysts revealed that Mn could alter the oxide species on the metal surface and interfere with the formation of CeO 2 crystals, which led to smaller grains, enhanced adsorption oxygen, and greater specific surface area. The Mn x Ce 1-x O 2 /γ-Al 2 O 3 crystals could form a solid solution, which helps higher catalytic activity . This study adds to the understanding of the synergistic mechanism of the loaded Ce–Mn oxide catalysts in the heterogeneous catalytic ozonation system and provides a feasible method for degrading pharmaceutical wastewater.