Preparation and Evaluation of a Photo-Fenton Heterogeneous Catalyst: Spinel-Typed ZnFe2O4

Abstract:

In this study, spinel-typed ZnFe₂O₄ was synthesized through Sol-Gel method, using fresh egg white as a complexing agent, and characterized by XRD and SEM. Then, the synthesized sample was used as the photo-Fenton heterogeneous catalyst for the discoloration of methyl orange (MO) in solution. The XRD results show that the synthesized sample was pure, only with the spinel structure, when the volume ratio of the fresh egg white/ferric nitrate/zinc nitrate was 2:2:1. And the lowest sintered temperature to obtain the single-phase ZnFe₂O₄ was 500°C. The SEM results reveal that the ZnFe₂O₄ crystalline grains presented irregular shapes and desultorily aggregated together, with a average diameter of 150-250nm. The experimental results show that MO could be efficiently discolored in photo-Fenton system of ZnFe₂O₄ and H₂O₂, under UV irradiation. MO discoloration ratio increased as H₂O₂ dosage increasing. The optimum dosage of ZnFe₂O₄ was 1g/L in this study. With the MO initial concentration increasing, MO discoloration ratio decreased. The ZnFe₂O₄ sample obtained at 500°C exhibited the optimum MO discoloration ratio. Finally, the mechanism for MO discoloration in the photo-Fenton system was discussed.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 329-335
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.329
• Online since: July 2012
• Authors: Ping Li, Huan Yan Xu, Xue Li, Wei Chao Liu, Yan Li
• Keywords: Heterogeneous Catalyst, Photo-Fenton, Sol-Gel Method, Spinel-Typed ZnFe₂O₄

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