Heterogeneous Fenton degradation of ofloxacin catalyzed by magnetic nanostructured MnFe2O4 with different morphologies
2021
Qin, Hangdao | Yang, Yingchang | Shi, Wei | She, Yuanbin
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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