Fe-Mn/UiO-66 catalysts for catalytic wet peroxide oxidation of metronidazole in pharmaceutical wastewater

Abstract Novel Fe-UiO-66, Mn-UiO-66 and Fe/Mn-UiO-66 catalysts were prepared and applied for the catalytic wet peroxide oxidation (CWPO) of metronidazole in pharmaceutical wastewater. The effects of Fe and Mn loading rate, catalyst dosage, metronidazole concentrations, calcined temperature of Mn-UiO-66 and Fe/Mn ratio on the CWPO of metronidazole wastewater were systematically studied. The Fe-UiO-66 catalysts exhibited good catalytic activity for the CWPO degradation of metronidazole wastewater (XMNZ = 93%, XH2O2 = 78%) compared with Mn-UiO-66 catalysts (XMNZ = 20%, XH2O2 = 30%). The bimetallic Fe/Mn can effectively increase the catalytic activity of Mn-UiO-66 catalysts. The kinetics study indicates that the CWPO process is well fit for the first order reaction with activation energy of 89.37 kJ/mol and 95.08 kJ/mol on the Fe-UiO-66 and 2Fe/Mn-UiO-66 catalysts, respectively. The supported UiO-66 catalyst shows good catalytic activity used for the CWPO of metronidazole in pharmaceutical wastewater which shows potential application in the environmental field.