MOFs-derived CoFe₂O₄@N-doped Carbon Material Catalyzes PMS For The Degradation Of Norfloxacin And Sulfamethoxazole

The abuse of antibiotics has become a hot topic in recent years.Due to the low treatment efficiency of traditional sewage treatment plants,Norfloxacin(NOR)and sulfamethoxazole(SMX)are frequently detected in various water environments as co mmonly used antibiotics.SR-based advanced oxidation technology has great potential in the field of degradation of antibiotics due to its unique advantages.In this study,utilizing the structural advantages of metal organic Frameworks(MOFs),a one-step calcination of precursors was used to prepare a CoFe2O4@N-doped carbon Material with high catalytic activity and high stability,which was used to activate PMS to generate active radicals such as SO4·-to degrade the above two antibiotics of,from this,the following main conclusions are obtained:1:The prepared CoFe2O4@N-doped carbon material has a specific surface area of 109.658 m2/g,it contains a rich mesoporous structure,which is conducive to the adsorption of pollutants on the surface of the catalyst.the proportions of C,N,O,Fe and Co atoms in the synthesized catalyst are 31.98%,11.29%,38.90%,13.35%,and 4.48%,respectively.The high amount of N-doped effectively improves the catalytic activity of CoFe2O4@N-doped carbon materials;2:NOR and SMX are rapidly degraded within 40 min.The active oxygen species generated when CoFe2O4@N-doped carbon material activates PMS include SO4·-,·OH and 102,the generation of SO4·-,·OH overcomes the weaker1O2 oxidation ability and the1O2 avoids the influence of other substrates in water on free radicals,which is of great significance to the practical application of heterogeneous catalysts in natural water bodies.The structure of the catalyst before and after the reaction has not changed significantly,it can maintain high catalytic activity after 3 cycles,the leaching concentration of Co ions are effectively reduced through the synergistic effect of Fe and Co;3:The mineralization rates of NOR and SMX in 180 min are 33.56%and 36.28%,respectively.The intermediate products that may appear in the degradation process were determined by LC/MS.According to their structure,four kinds of degradation pathways of NOR were proposed,including dehydroxylation Chemical conversion,defluorination,quinolone conversion and piperazine ring conversion;SMX degradation mainly involves S-N bond cleavage,isoxazole ring opening and benzene ring opening,it is worth mentioning that the toxicity of these intermediate products are weaker compared with the parent compound,which is essential for the degradation of antibiotics.