The enhanced Fenton-like catalytic performance of PdO/CeO2 for the degradation of acid orange 7 and salicylic acid

doi:10.1016/S1872-2067(14)60261-8

Abstract

Abstract:

A PdO/CeO₂ catalyst was prepared by deposition-precipitation method and characterized with X-ray diffraction, high-resolution transmission electron microscopy, N₂ adsorption-desorption, X-ray photoelectron spectroscopy and Raman spectroscopy. The results show that the Pd is presented as Pd²⁺ in the catalyst. The interaction between the deposited PdO and CeO₂ increases the Ce³⁺ content. The catalytic activity of PdO/CeO₂ was tested in the heterogeneous Fenton-like degradation of acid orange 7 (AO7) and salicylic acid (SA), both in the dark and under visible irradiation. Deposition of PdO accelerates the Fen-ton-like degradation of SA, which reaches a maximum at 1.0 atom% PdO loading. A dye sensitization effect was seen with AO7 under visible irradiation. Dye sensitization promotes the regeneration of Ce³⁺ by interfacial peroxides species through interfacial electron injection. Consequently, the combined effects of PdO loading and visible light irradiating enhanced the Fenton-like activity to a reaction rate constant of 3.90 h^-1 for the 1.0 PdO/CeO₂, a ca. 50-fold improvement.

Key words: Fenton-like reaction, Ceria, Palladium oxide, Degradation, Hydrogen peroxide

Lin Ge, Chengjie Zang, Feng Chen. The enhanced Fenton-like catalytic performance of PdO/CeO₂ for the degradation of acid orange 7 and salicylic acid[J]. Chinese Journal of Catalysis, 2015, 36(3): 314-321.

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The enhanced Fenton-like catalytic performance of PdO/CeO₂ for the degradation of acid orange 7 and salicylic acid

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