Enhanced Catalytic Ozonation by Mn–Ce Oxide-Loaded Al<sub>2</sub>O<sub>3</sub> Catalyst for Ciprofloxacin Degradation
Dajie Yang, Fanbin Meng, Zhuoran Zhang, Xiang Liu
Abstract
High Resolution Image Download MS PowerPoint Slide Catalytic ozonation is an effective and promising advanced oxidation technology for organic pollutant removal. Herein, CexMn 1– x O 2 metal oxides loaded on Al 2 O 3 catalysts (Mn–Ce/Al 2 O 3 ) were synthesized for catalytic ozonation of the wastewater containing ciprofloxacin. The morphology, crystal structure, and specific surface area of the prepared catalyst were characterized. The characteristics of the Mn–Ce/Al 2 O 3 catalyst revealed that the loaded MnO 2 could interfere with the formed CeO 2 crystals and then produced complex CexMn 1– x O 2 oxides. Compared with an ozone-alone system (47.4%), the ciprofloxacin degradation efficiency in the Mn–Ce/Al 2 O 3 catalytic ozonation system elevated to 85.1% within 60 min. The ciprofloxacin degradation kinetic rate over the Mn–Ce/Al 2 O 3 catalyst is 3.0 times that of the ozone-alone system. The synergetic corporation of redox pairs between Mn(III)/Mn(IV) and Ce(III)/Ce(IV) in the Mn–Ce/Al 2 O 3 catalyst could accelerate ozone decomposition to generate active oxygen species and further significantly improve the mineralization efficiency of ciprofloxacin. The work demonstrates the great potential of developing dual-site ozone catalysts for advanced treatment of wastewater.