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CuFeO/CeO as a novel catalyst was synthesized and its catalytic performance was evaluated for electro-Fenton degradation of acid orange 7 (AO7). It was demonstrated from the characterization results that the rhombohedral structure of CuFeO and face-centered cubic fluorite structure of CeO remained stable after nanocomposite construction. The impact of such operating parameters as pH, current intensity and, catalyst amount was investigated and the optimum conditions (100 mgL AO7, pH 3, 150 mgL CuFeO/CeO,
150 mA) determination led to 99.3% AO7 removal and 79.1% COD removal in 60 min. The introduction of CeO as non-inert support had a significant impact on HO electro-generation as an important step in AO7 removal. CuFeO/CeO presented negligible metal leaching (iron 4.13%, copper 2.4%, and cerium 0.33%) which could be due to the strong interaction between active species and support. The nanocomposite performed efficiently in salty systems and two samples of real wastewaters due to Brønsted acidity character of ceria, which makes it a potential choice in industrial applications. The good performance of nanocomposite could be the result of the synergistic effect between Fe, Cu, and Ce. Regarding scavenging measurements results, the electro-Fenton process followed the Haber-Weiss mechanism. The by-products detection was performed using GC-MS analysis to propose an acceptable pathway for EF degradation of AO7. The BMG kinetics model (1/b = 0.969 (min) and 1/m = 0.269 (min)) was matched with the experimental data and described the kinetics of reaction very well. The catalytic activity of CuFeO/CeO almost remained after six cycles. Based on the obtained results, CuFeO/CeO using the benefit of the synergistic effect of Ce with Fe and Cucan be introduced as a promising novel catalyst for the electro-Fenton reaction in wastewater treatment.
This article was published in the following journal.
Name: Environmental pollution (Barking, Essex : 1987)
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