Heterogeneous Fenton Reaction for Degradation of Ofloxacin with Magnetic CeO2/Fe3O4

CeO2/Fe3O4 magnetic nanoparticles were prepared for promoting the catalytic activity of Fe3O4, which is applied as the catalyst of heterogeneous Fenton reaction system for the degradation of ofloxacin. Several factors that affected the degradation efficiency of the system such as CeO2 content, H2O2 concentration and pH were investigated. The mechanism of catalytic degradation was also explored via the measurement of iron ion and kinetics fitting. The results show that the catalytic activity of CeO2/Fe3O4 is better than that of Fe3O4. The degradation efficiency of ofloxacin increases with the addition of CeO2 content, H2O2 concentration or solution acidity increase. The degradation effect of ofloxacin is the best for CeO2/Fe3O4(molar roction=0.780)-H2O2 catalytic system when H2O2 concentration is 100 mmol/L and pH is 3, which accords first order kinetics model. The catalytic ability of CeO2/Fe3O4 is strengthened through surface catalytic reaction and electronic transfer of oxygen vacancies of CeO2 during catalytic reaction.