Synthesis of (Fe0.2Co0.2Ni0.2Cu0.2Mn0.2)Fe2O4 High Entropy Spinel Oxide for Photo-Fenton Degradation of Oxytetracycline Hydrochloride Over a Wide pH Range
Yuxin Gan, Dan Liu, Zhipu Wang, Ge Huang, Rumei Ze, Xiaohong Wang, Jiabin Zhou
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引用次数: 0
Abstract
Iron-based spinel oxides, with excellent catalytic activity and stability, hold promising potential in the photo-Fenton degradation of organic pollutants. In this study, (Fe0.2Co0.2Ni0.2Cu0.2Mn0.2)Fe2O4 was prepared via the solution combustion method. Multiple characterization techniques confirmed the good stability and morphology of (Fe0.2Co0.2Ni0.2Cu0.2Mn0.2)Fe2O4. It exhibited high-entropy oxide properties, making it suitable as a photo-Fenton catalyst for the efficient degradation of oxytetracycline hydrochloride (OTC-HCl). Under visible light (Vis) with 10 mM H2O2, 0.06 g/L OTC-HCl, and pH 4.0, the catalyst achieved a degradation efficiency of 92.9%. In the photo-Fenton system, the utilization rate of H2O2 (calculated as the ratio of the degradation amount of OTC-HCl to the consumption amount of H2O2) was 34.5, which is 8.3 times higher than that of pure H2O2 (4.2). The catalyst showed good acid–base adaptability, achieving OTC-HCl removal rates exceeding 92.0% across a pH range of 3–11, with a reaction rate constant of 0.08 min−1 at pH 11. Free-radical capture experiments showed that (Fe0.2Co0.2Ni0.2Cu0.2Mn0.2)Fe2O4 catalyzed H2O2 to generate ·OH, ·O2−, and e−, which are the main free radicals involved in the degradation of OTC-HCl. In summary, (Fe0.2Co0.2Ni0.2Cu0.2Mn0.2)Fe2O4 not only addresses the issue of low H2O2 utilization in traditional photo-Fenton systems but also catalyzes the generation of H2O2 under light conditions. Thus, it can serve as an excellent photo-Fenton catalyst for OTC-HCl degradation.
期刊介绍：
Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.
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