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In this work, magnetic nanoparticles (MNPs) Fe 3 O 4 /CeO 2 synthesized by the method of impregnation oxidation-precipitation were used as the heterogeneous catalyst for the degradation of Pantoprazole. Response surface methodology based on central composite design was used to investigate the individual and the interactive effects of three process parameters on the Pantoprazole degradation, i.e. the initial pH of the solution, the dosage of H 2 O 2 and the initial concentration of Pantoprazole. Under the optimal conditions of pH 3.3, H 2 O 2 30.0 mM, Pantoprazole 20.0 mg L −1 , catalyst 2.0 g L −1 and 35 °C, the degradation percentage of Pantoprazole was 98.0% within 120 min. The obtained results agreed well with the modeling prediction ( R 2 = 0.9924, and Adj- R 2 = 0.9889), and the degradation reaction well followed the first-order kinetic with R 2 = 0.9986. According to the results of the iron leaching and the effects of the radical scavengers and the intermediates determination, a possible pathway of Pantoprazole degradation was proposed based on ·OH mechanism. [ABSTRACT FROM AUTHOR]

In this work, magnetic nanoparticles (MNPs) Fe 3 O 4 /CeO 2 were firstly synthesized using three different preparation methods, including coprecipitation, impregnation oxidation-precipitation and impregnation reduction-precipitation, respectively. The catalytic activities of Fe 3 O 4 /CeO 2 MNPs, prepared by above three methods, were compared systematically in terms of the degradation of orange G (OG). The impregnation oxidation-precipitation process was economical and maneuverable due to the usage of air, no need of nitrogen protection and higher utilization efficiency of iron. Response surface methodology based on central composite design were used to investigate the individual and interactive effects of three process parameters on the OG degradation, i.e. the initial pH of the solution, the dosage of H 2 O 2 and the initial concentration of OG. Under the optimal conditions of pH 2.5, H 2 O 2 30 mM, OG 50 mg L −1 , catalyst 2.0 g L −1 and 35 °C, the degradation percentage of OG was 98.2% within 120 min, which agreed well with the modeling prediction (R 2 = 0.9984, and Adj-R 2 = 0.9969). And the degradation reaction well followed the first-order kinetic with R 2 = 0.9969. The Fe 3 O 4 /CeO 2 -OX MNPs showed high catalytic activity, stability and reusability in the degradation of OG. [ABSTRACT FROM AUTHOR]