Degradation of quinoline by ozone oxidation using Fe3Ce2/NaY catalyst

Herein, Fe₃Ce₂/NaY catalysts for catalyzing the oxidative degradation of quinoline by ozonation were prepared by the impregnation method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The Fe₃Ce₂/NaY had high activity for catalyzing ozone oxidation, the quinoline removal efficiency reached 99.14 % in 10 min for the 90 mg/L quinoline solution. Meanwhile, the catalyst had good reusability and the COD removal performance was almost unchanged during four cycles of reaction. In the catalytic ozone oxidation system, the reaction kinetics of quinoline degradation were consistent with a pseudo-first-order reaction. Surface hydroxyl groups facilitated the adsorption and decomposition of O₃, thus promoting the generation of reactive oxygen species (ROS) and improving the quinoline mineralization efficiency, which played an important role in the catalytic process. The degradation intermediates were also investigated using liquid chromatography-mass spectrometry (LC-MS) and ion chromatography.