Degradation of Bisphenol a by Peroxymonosulfate Activated with Mil-88b(Fe) Derived Cc-Fe/C Catalysts: Effect of Annealing Temperature, Performance and Mechanism

Fe0/Fe3C/Fe3O4 nanoparticles wrapped in graphite shells (CC-Fe/C) were synthesized via pyrolyzing MIL-88B (Fe) at 700, 800, and 900 degrees C. CC-Fe/C-800 prepared at 800 degrees C exhibited the best performance for activating peroxymonosulfate with complete removal of bisphenol A at 10 mg/L in 20 min, attributing to the synergistic effect of multiple active sites (Fe0, Fe3C, and Fe3O4) on its surface. Mechanism study suggested that SO4 center dot- , center dot OH, 1O2, and O2- center dot were involved in the degradation. Fe0 cores could act as cocatalysts to promote the regeneration of Fe2+, enhancing the catalytic activity. Finally, CC-Fe/C-800 showed good reusability and practicability.