Preparation Of Porous Carbon Based On MOFs And Its Electrocatalytic Degradation Of Ceftriaxone Sodium In Water

With the wide application of antibiotics in medical and animal husbandry fields,the large amount of antibiotic residues in water has also become a major environmental problem.Electrochemical advanced oxidation（EAOP）is considered as an effective method to deal with such problems because of its easy operation and non-pollution characteristics,and the search for stable and efficient cathode materials is one of the keys to EAOP applications.In this paper,cobalt MOFs porous carbon（Co-MOFs-PC）and cobalt-nickel MOFs porous carbon（Co/Ni-MOFs-PC）materials were prepared based on MOFs materials and applied to the degradation of ceftriaxone sodium and its simulated wastewater in water,providing an effective method for the electrochemical degradation of antibiotic-like wastewater.In this paper,Co-MOFs-PC composites were prepared by hydrothermal and carbonization method using Co（NO₃）₂·6H₂O and 1,3,5-benzoic acid as raw materials.Co-MOFs-PC has good redox ability and low impedance characteristics.It was applied to electrocatalytic degradation of ceftriaxone sodium(10 mg·L^-1)in water,and the degradation rate of ceftriaxone sodium was 82.91%after 120 min of reaction.After 20cycles of recycling,the Co-MOFs-PC electrode showed good stability.The Co/Ni-MOFs-PC composite was prepared by introducing Ni（NO₃）₂·6H₂O as the Ni source on the basis of Co-MOFs.The prepared Co/Ni-MOFs-PC has a secondary structure with many nanorods and nanospheres grown on the surface of hollow microspheres,and Ni and Co form a spinel structure Co₂Ni O₄.The carbonized material has a rich pore structure,and a large number of micropores（44.3%）give the material a large specific surface area(1135 m²·g^-1)with an average pore size of 2.80 nm The surface is rich in oxygen-containing functional groups,and the Co/Ni-MOFs-PC electrode has a very good electrocatalytic activity for ceftriaxone sodium,and the degradation rate was 96.41%after 120 min of reaction.After 20 cycles of recycling,the electrode sheet still retained 82.20%of the initial catalytic activity,indicating that the electrode sheet has good stability.In the experiment of electrocatalytic degradation of simulated wastewater for enzymatic production of cephalosporin,Co/Ni-MOFs-PC showed a very good degradation effect,and the COD removal rate was 97.78%after 480 min of reaction,and the electrode energy consumption W_COD was 1.74 k Wh·g^-1.