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An efficient Fenton-like catalyst CuO/CeO 2  was synthesized using ultrasonic impregnation and used to remove diclofenac from water. The catalyst was characterized by N 2  adsorption-desorption, SEM-EDS, XRD, HRTEM, Raman, and XPS analyses. Results showed that CuO/CeO 2  possessed large surface area, high porosity, and fine elements dispersion. Cu was loaded in CeO 2 , which increased the oxygen vacancies. The exposed crystal face of CeO 2  (200) was beneficial to the catalytic activity. The diclofenac removal experiment showed that there was a synergistic effect between CuO and CeO 2 , which might be caused by more oxygen vacancies generation and electronic interactions between Cu and Ce species. The experimental conditions were optimized, including pH, catalyst and H 2 O 2  dosages, and 86.62% diclofenac removal was achieved. Diclofenac oxidation by ·OH and adsorbed oxygen species was the main mechanism for its removal in this Fenton-like system.

A High-Efficiency CuO/CeO2 Catalyst for Diclofenac Degradation in Fenton-Like System