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Regeneration (catalyst dose 0.4 g/L, H2O2 concentration 1 mM, metronidazole initial concentration 25 mg/L, pH 7 and reaction time 40 min) (a), FESEM image (b) and XRD analysis (c) of Fe3O4@HZSM-5 magnetic nano-heterogeneous catalyst after seven recycling cycles.
