CoFe2O4 nanoparticles anchored on waste eggshell for catalytic oxidation of florfenicol via activating peroxymonosulfate

Eggshell-loaded CoFe2O4 catalyst was synthesized via a convenient hydrothermal method during our work, then the surface morphology and elemental composition of the composites were systematically investigated. Performance of CoFe2O4/eggshell-activated peroxymonosulfate (PMS) system was evaluated by selecting florfenicol (FF) as the model pollutant, and effects of operating parameters and water matrices on the FF removal efficiency in this system were investigated. In addition, main radicals involved in FF degradation were identified by EPR tests and radical quenching experiments, and possible mechanism was proposed. The reduction of toxicity during FF degradation was confirmed, and in combination with HP-LC tests, it was found that dehalogenation and defluorination were effectively carried out during FF degradation. In addition, the prepared CoFe2O4 polyvinylidene fluoride (PVDF) membrane effectively improved the stability of the material and reduced the precipitation of metals.