Flower-Shaped MnFe2O4@MoS2 Nanocomposite Activated H2O2 for Efficient Degradation of Tetracycline: Performance Evaluation, Mechanism and Degradation Pathway

文献类型： 外文期刊

第一作者： Sun, Yunyun

作者： Sun, Yunyun;Zhao, Lanpo;Sun, Yunyun;Liu, Fangming;Gao, Yushan;Dou, Jingang;Jiang, Yecheng;Deng, Aoyan;Liu, Huitao

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关键词： H2O2 activation; MnFe2O4@MoS2 catalyst; catalytic mechanism; degradation pathways; toxicity analysis

期刊名称：CATALYSTS （ 影响因子：4.0； 五年影响因子：4.0 ）

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年卷期： 2024 年 14 卷 10 期

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收录情况： SCI

摘要： The limited utilization of H2O2 restricts the practical application of heterogeneous Fenton oxidation technology. In this study, the flower-shaped MnFe2O4@MoS2 nanocomposite was prepared by two-step hydrothermal treatment, constructing MnFe2O4@MoS2/H2O2 system for the degradation of tetracycline (TC). Under optimized conditions, MnFe2O4@MoS2/H2O2 system fully degraded 20 mgL-1 of TC within 60 min, and the corresponding utilization of H2O2 was also as high as 95.7%. Meanwhile, this system not only exhibited excellent cycling stability for the degradation of TC but also had good anti-interference ability against actual water sources, inorganic cations and anions and natural organic compounds. The efficient activation of H2O2 in MnFe2O4@MoS2/H2O2 system mainly relied on the redox cycling of Fe(II)/Fe(III) and Mn(II)/Mn(III) mediated by MoS2; meanwhile, the oxygen vacancies caused by redox cycling also accelerated activation of H2O2, resulting in the production of a large number of active species (OH, O2(-) and O-1(2)) for rapid degradation of pollutants. The vulnerable atomic sites of TC were confirmed through theoretical calculation, and four degradation pathways of TC in MnFe2O4@MoS2/H2O2 system were proposed. Finally, the toxicity analysis confirmed that the toxicity of degradation intermediates was developing towards low toxicity. This study provided new insights into the wide application of heterogeneous Fenton systems in wastewater treatment.

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