Evaluates Mn-doped Fe2O3's efficacy in degrading tetracycline, suggesting enhanced photocatalytic performance.
Mn-doped Fe2O3 with the different Mn/Fe ratio (marked as XMn-Fe2O3, X = 1, 2, 3, 4) were prepared via a facile one-step hydrothermal method. The crystalline structure, morphology, and chemical state were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron Microscopy. The morphology of Mn doped Fe2O3 exhibited significant variations with Mn doping concentration and tended to form polyhedral structures. The photo-Fenton degradation activity and reusability of the synthesized catalysts for tetracycline removal were evaluated under visible light illumination. The results demonstrated that 2Mn-Fe2O3 achieved the higher removal tetracycline efficiency of 65% at 90 min, and with only slight performance degradation after four consecutive cycles times under identical conditions. Based on the radical trapping experiments and electron paramagnetic resonance analysis, the enhanced photo-Fenton activity might be attributed to the following factors: on the one hand, the appropriate concentration of Mn doping reduces the bandgap of Fe2O3, suppresses electron/hole recombination and enhances photoexcited charge carrier mobility. On the other hand, the synergistic interaction between Mn and Fe ions can promote the activation of hydrogen peroxide to generate more ·OH radicals, while the Mn³+/Mn2+and Mn4+/Mn³+ redox cycle accelerates the Fe³+/Fe2+ cycle.
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Wu et al. (2026) studied this question.
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