Strudy On The Preparation Of Mental Organic Framework-Derived CuOx-C Electrodes And Catalytic Degradation Of Cephalosporin Antibiotics In Water

Electrochemical oxidation technology is widely used in the field of antibiotic wastewater treatment due to its advantages of environmental friendliness,high efficiency of degradation and strong oxidation ability,and the nature of the anode material determines the removal rate of the target antibiotic to a large extent.Metal-organic framework materials have the advantages of high specific surface area,strong controllability of function and structure,etc.,and have become a hot spot in the research of electrocatalytic materials.In this study,a new metal oxide porous carbon electrode was prepared using a metal organic framework material as a precursor,and its degradation effect on ceftazidime and cefaclor was studied.Related mechanisms were studied to provide a reference for the development of new electrochemical oxidation electrode materials.The main research results are as follows:1.The metal oxide porous carbon anodes was prepared by using metal organic framework as precursor.Through the ceftazidime degradation experiment,the CuOx-C electrode with the best effect was selected.The effects of calcination temperature and atmosphere on the electrode structure composition and degradation performance were investigated.SEM and BET analysis found that Cu-BTC can maintain regular octahedral structure after calcined.Calcined in nitrogen atmosphere is beneficial to the formation of mesoporous structure and Cu element.The CuOx-C-550N electrode material has the largest BET specific surface area(135.12 m2·g-1),the strongest conductivity,and the removal effect of ceftazidime is close to 100%.The results of CV analysis showed that the degradation of ceftazidime in the system was caused by the indirect oxidation of oxidizing species produced by the anode.2.The experiment of 20 repeated cycles shows that the prepared CuOx-C-550N electrode has the ability of long-term stable operation.The concentration of copper ions leached in the system was 0.3470 mg·L-1 within one degradation experiment period(30 min).The influence of main parameters on the degradation effect and kinetics of cephalosporin was investigated.Under the optimal degradation conditions,5 mg·L-1 of ceftazidime can be completely removed within 20 minutes,and the removal rate of cefaclor can also reach 88.81%.3.Flourescence spetrometry,UV-vis and HPLC-MS were used to analyze the active species,complex compounds and intermediate products during the degradation of ceftazidime.It was found that Cu2+/Cu+redox electricity played a key role in the degradation of ceftazidime.Last,the degradation process of ceftazidime in the reaction system was speculated.