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Effective degradation of quinoline by catalytic ozonation with MnCexOy catalysts: performance and mechanism

Zhang Jie,Wu Zhaochang,Dong Ben,Ge Sijie,He Shilong

View large Download slide View large Download slide Close modal Quinoline inevitably remains in the effluent of coking wastewater treatment plants due to its bio-refractory nature, which might cause unfavorable effects on human and ecological environments. In this study, MnCe x O y was consciously synthesized by α -MnO 2 doped with Ce 3+ (Ce:Mn = 1:10) and employed as the ozonation catalyst for quinoline degradation. After that, the removal efficiency and mechanism of quinoline were systematically analyzed by characterizing the physicochemical properties of MnCe x O y , investigating free radicals and monitoring the solution pH. Results indicated that the removal rate of quinoline was greatly improved by the prepared MnCe x O y catalyst. Specifically, the removal efficiencies of quinoline could be 93.73, 62.57 and 43.76%, corresponding to MnCe x O y , α -MnO 2 and single ozonation systems, respectively. The radical scavenging tests demonstrated that • OH and • O 2 - were the dominant reactive oxygen species in the MnCe x O y ozonation system. Meanwhile, the contribution levels of • OH and • O 2 - to quinoline degradation were about 42 and 35%, respectively. The abundant surface hydroxyl groups and oxygen vacancies of the MnCe x O y catalyst were two important factors for decomposing molecular O 3 into more • OH and • O 2 - . This study could provide scientific support for the application of the MnCe x O y /O 3 system in degrading quinoline in bio-treated coking wastewater. MnCe x O y Ce 3+ , MnCe x O y • OH and • O 2 - MnCe x O y were successfully synthesized by α-MnO 2 doped with Ce 3+ . The by abundant oxygen vacancies and surface hydroxyl groups of the MnCe x O y catalyst enhanced its catalytic activity. • OH and • O 2 - formation contributed to quinoline degradation in the MnCe x O y ozonation system.