Persulfate activation by ferrocene-based metal-organic framework microspheres for efficient oxidation of orange acid 7

Ferrocene-based metal-organic framework with different transition metals (M-Fc-MOFs, M=Fe, Mn, Co) was synthesized by a simple hydrothermal method and used as a heterogeneous catalyst for persulfate activation. The samples were characterized by X-ray diffraction, transmission electron microscopy, X-ray electron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. Meanwhile, the influences of factors such as catalyst dosage, persulfate concentration, and pH on the degradation of acid orange 7 (AO7) were studied in detail. The results showed that hollow cobalt-based ferrocenyl metal-organic framework microspheres (Co-Fc-MOFs) exhibited the best catalytic performance, which is closely related to the synergy of Fc/Fc(+) and Co(II)/Co(III) cycles in persulfate activation. Free radical quenching studies indicated that both sulfate and hydroxyl appeared to contribute to the degradation of AO7.

Automated summary

In this study, ferrocene-based metal-organic frameworks with different transition metals were synthesized and used as catalysts for persulfate activation. The effects of catalyst dosage, persulfate concentration, and pH on the degradation of acid orange 7 were investigated. The results showed that cobalt-based ferrocenyl metal-organic framework microspheres exhibited the best catalytic performance.