Preparation Of MOFs Derived Composite Electrode And Degradation Of Ceftazidime In Water

Electrochemical catalytic process is one of the advanced oxidation processes that are green,efficient and energy-saving,to meet the broad-spectrum degradation of most pollutants in modern industry.Electrochemical catalysis technology includes electrochemical oxidation,reduction,electrocoagulation,Photoelectrochemical oxidation and so on.Electrochemical oxidation is one of the earliest and most researched electrochemical processes,which uses metals,metal oxides or carbon materials to electrochemically degrade organic pollutants in water,atmosphere,and soil with anodes.There are remaining hidden dangers with narrow heat/acid-resistant and metal dissolution in some anode materials with high catalytic activity.Recent research focus on metal organic frameworks with large specific surface area,adjustable pore diameter and primary metal core and carbon framework due to the limits of traditional anode materials with instability and high-cost preparation.A novel composite electrode was prepared by hybridizing traditional DSA electrodes and metal-organic framework materials for the degradation of pollutants in water environment.The main research contents are as follows:（1）The carbon coated SnO₂-Sb/Ni electrode was prepared by one-step in-situ growth hydrothermal method with the help of multi-walled carbon nanotube CNT then carbonized and pyrolyzed in N₂atmosphere.The appearance,element composition and valence distribution of the prepared electrodes were investigated by SEM,XRD,XPS,BET and electrochemical characterization.The electrode was also applied to the electrochemical degradation process of ceftazidime antibiotic simulated wastewater,optimizing the degradation conditions of laboratory scale.（2）The reaction mechanism and intermediate product path of the electrode participating in the organic mineralization process were explored.The identification of intermediate active groups was carried out through a variety of quenchers and EPR experiment.The electrode was mainly based on the direct electron transfer between the electrode surface and the catalyst in the degradation system was found.There are easily broken chiral unsaturated double bonds and weak C-N bonds in the matrix of ceftazidime,resulting in the breaking of pyridine groups,thiazole rings and lactam rings at both ends,and further formation of small molecules.Improving the traditional DSA electrode with MOFs is one of the technical routes that still have exploration prospects with the above research contents.