Abstract
Magnetic nanostructured MnFe2O4 with different morphologies, synthesized via chemical co-precipitation and hydrothermal method, was assayed as heterogeneous Fenton catalysts. The as-prepared MnFe2O4 catalysts were thoroughly characterized by various characterization methods, such as X-ray diffraction (XRD), N2 adsorption-desorption, transmission electron microscopy (TEM), magnetic hysteresis loops, temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The catalytic activity of MnFe2O4 catalysts was evaluated in the heterogeneous Fenton degradation of ofloxacin (OFX). In our study, the morphology exhibited a critical impact on the catalytic activity of MnFe2O4. For example, MnFe2O4 nanorods (MnFe2O4-NR) had a higher catalytic activity than MnFe2O4 nanospheres (MnFe2O4-NS) and MnFe2O4 nanocubes (MnFe2O4-NC) in OFX removal and H2O2 decomposition. Notably, the catalytic activity was remarkably enhanced with increasing the relative amount of Mn3+ and Fe2+ species on the surface. Based on the results from quenching experiments and quantitative determination of •OH radicals, a possible catalytic mechanism of MnFe2O4 was proposed. In addition, the stability and reusability of MnFe2O4-NR was ascertained, as the results suggested that MnFe2O4-NR was a stable and easily separated catalyst for heterogeneous Fenton process.
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This study was financially supported by the Department of Education of Guizhou Province (QJHKYZ [2020] 042), National Natural Science Foundation of China (21805211, 51862033), and Science and Technology Foundation of Guizhou Province (JC[2017]1185, JC[2018]1164, ZC[2020]2Y037, PTRC[2017]5604).
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Hangdao Qin conducted experiments and analyzed experimental data, was a major contributor in writing the original manuscript. Yingchang Yang interpreted the experimental data, and also a major contributor in writing the original manuscript. Wei Shi and Yuanbin She wrote, reviewed, and edited the manuscript. All authors read and approved the final manuscript.
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Qin, H., Yang, Y., Shi, W. et al. Heterogeneous Fenton degradation of ofloxacin catalyzed by magnetic nanostructured MnFe2O4 with different morphologies. Environ Sci Pollut Res 28, 26558–26570 (2021). https://doi.org/10.1007/s11356-021-12548-y
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DOI: https://doi.org/10.1007/s11356-021-12548-y