Enhanced Catalytic Ozonation by Mn-Ce Oxide-Loaded Al2O3 Catalyst for Ciprofloxacin Degradation

Catalytic ozonation is an effective and promising advancedoxidationtechnology for organic pollutant removal. Herein, CexMn(1-x )O(2) metal oxides loaded on Al2O3 catalysts (Mn-Ce/Al2O3) were synthesized for catalytic ozonation of the wastewater containingciprofloxacin. The morphology, crystal structure, and specific surfacearea of the prepared catalyst were characterized. The characteristicsof the Mn-Ce/Al2O3 catalyst revealedthat the loaded MnO2 could interfere with the formed CeO2 crystals and then produced complex CexMn(1-x )O(2) oxides. Compared with an ozone-alonesystem (47.4%), the ciprofloxacin degradation efficiency in the Mn-Ce/Al2O3 catalytic ozonation system elevated to 85.1%within 60 min. The ciprofloxacin degradation kinetic rate over theMn-Ce/Al2O3 catalyst is 3.0 times thatof the ozone-alone system. The synergetic corporation of redox pairsbetween Mn(III)/Mn(IV) and Ce(III)/Ce(IV) in the Mn-Ce/Al2O3 catalyst could accelerate ozone decompositionto generate active oxygen species and further significantly improvethe mineralization efficiency of ciprofloxacin. The work demonstratesthe great potential of developing dual-site ozone catalysts for advancedtreatment of wastewater.

Automated summary

This study investigates the application of CexMn(1-x )O(2) metal oxides loaded on Al2O3 catalysts (Mn-Ce/Al2O3) in catalytic ozonation for the degradation of ciprofloxacin in wastewater. The results show that the use of Mn-Ce/Al2O3 catalyst significantly enhances the degradation efficiency of ciprofloxacin and increases the reaction rate by 3 times compared to ozone alone.