Fabrication of Flower-like CeO2 with Intrinsic Oxidase Activity for Methyl Orange Degradation Applications

Abstract

Abstract. Since the CeO2 materials were found with oxidase-like activity, they were received wide attention because of without the addition of an unstable oxide substrate H2O2 in the catalytic process, while, up to now the research about their application in catalytic oxidation of dye wastewater have hardly been reported. In this paper, flower-like CeO2 were synthesized and were characterized by SEM, XRD. The results showed that these CeO2 materials possessed the intrinsic oxidase activity. The property of flower-like CeO2 removing methyl orange was investigated. It was observed that the degradation rate can reach 77.5% with 40 mg CeO2 dosage and for 2 h at pH 4 when the concentration of methyl orange is 20 mgꞏL −1. These results provide strong evidence that flower-like CeO2 can be utilized as an oxidase mimetic for efficient catalytic degradation of the dye wastewater.