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Activation of peroxydisulfate by magnetic MoS2/CoFe2O4 composite catalyst for efficient degradation of tetracycline in water

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Abstract

Persulfate-based advanced oxidation process (PS-AOPs) is a promising technique for removing antibiotic contaminants from water. Magnetic MoS2/CoFe2O4 nanocomposites were synthesized by a hydrothermal method and first used to activate peroxydisulfate (PDS) to degrade tetracycline (TC). The optimal MoS2/CoFe2O4-20 catalyst achieved 96.2% degradation efficiency of TC (20 mg L−1) in the presence of PDS (1.5 g L−1) after 80 min, which was significantly higher than that of pure MoS2 and CoFe2O4. Moreover, MoS2/CoFe2O4 catalysts exhibited a better catalytic activity for TC removal by activating PDS than that of recently reported ferrite-based catalysts. The influence of initial pH, PDS dosage and inorganic anions on the removal of TC in MoS2/CoFe2O4-20/PDS oxidation system was studied. The quenching experiments and electron paramagnetic resonance (EPR) experiments show that the free radical (O2·−, SO4·− and ·OH) and non-radical (1O2) oxidation pathways collectively led to TC degradation in MoS2/CoFe2O4/PDS system. The exposed Mo(IV) sites on the surface of MoS2 can accelerate the cycle ≡ X(III)/ ≡ X(II) (X = Co or Fe) and the decomposition of PDS to generate the reactive species, thus enhancing the removal efficiency of TC. Cycling test confirms that as-synthesized MoS2/CoFe2O4 can be easily recovered and effectively reused. Besides, the removal of TC from various water matrices was also studied.

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The authors declare that all data supporting the findings of this study are available within the article.

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Acknowledgements

This work was supported by the Natural Science Foundation of Hebei Province (B2019209373) and Hebei Province High-level Talents Funded Project (No. B2020003030).

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Authors and Affiliations

  1. College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China

    Chao Zhang, Zhenli Su, Qiang Yu & Ming Ge

  2. Training Center, Tangshan Polytechnic College, Tangshan, 063299, China

    Jianyong Feng

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Contributions

All authors contributed to the study conception and design. CZ and JYFperformed the experiments on catalyst synthesis, antibiotic degradation and mechanism study. CZ, MG and QY analyzed the experimental data and wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Qiang Yu or Ming Ge.

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Zhang, C., Feng, J., Su, Z. et al. Activation of peroxydisulfate by magnetic MoS2/CoFe2O4 composite catalyst for efficient degradation of tetracycline in water. J Mater Sci: Mater Electron 34, 1938 (2023). https://doi.org/10.1007/s10854-023-11357-y

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