Co Based Carbon Materials as Bifunctional Catalysts for Efficient Degradation of Ciprofloxacin in Electro-Fenton System
The overuse of antibiotics has resulted in a significant accumulation of ciprofloxacin(CIP)and its degradation intermediates in the environment,posing a threat to the environment and human health.In recent years,it has been considered a promising method to use heterogeneous electron-Fenton technology for antibiotic pollution treatment.In this study,we used organic metal framework ZIF-67 as precursor,and prepared a series of Co based carbon electrocatalysts(Co-NC-T)under different temperatures.The successful formation of the catalysts was confirmed by morphology and crystal structure analysis,including scanning electron microscopy,high-resolution transmission electron microscopy and X-ray diffraction patterns.On the one hand,The results of X-ray photoelectron spectroscopy showed that Co-NC-900 contained the highest proportion of graphite N,which was beneficial for O2 to generate H2O2 through 2e‒ reduction reaction.On the other hand,the multiple valence states of Co[Co(0),Co(Ⅱ),Co(Ⅲ)]could promote the conversion of H2O2 into various reactive oxygen species during the reaction.The Co-NC-900 catalyst could simultaneously promote the formation and activation of H2O2,which was beneficial for the degradation of CIP.The quenching experiment and electron spin resonance experiment results indicated that the main reactive oxygen species in the system were·O2‒ and·OH.Reactive oxygen species could synergistically participate in the reaction,thereby improving the degradation efficiency of CIP.Under pH=3,the removal rate of Co-NC-900 to CIP was 94.5％in 120 min.This study provided theoretical guidance for the efficient degradation of CIP in wastewater.
Electro-FentonCiprofloxacin(CIP)ZIF-67Co based carbon materialActive oxygen species
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维普
