DBDP Collaboration Cu@PAF-45-COOH Experimental Study On Catalytic Degradation Of Chloramphenicol In Water

Antibiotics,as one of the four major categories of new pollutants,have received much attention in recent years.However,at present,the analysis of its environmental hazard mechanism,the mechanism of action,and the means of governance are not perfect.In this study,chloramphenicol was taken as the research object,and dielectric barrier discharge Plasma（DBDP）was used to investigate the degradation effect under different discharge voltage,air carrier gas flow and initial concentration of CAP,and explore the quantitative relationship between them.Further explore the synergistic effect of DBDP system on the removal of CAP from water using loaded catalysts,and use XRD,FT-IR and other methods to evaluate the effectiveness of PAF-45 Cu@PAF-45-COOH Perform characterization.Finally,LC-MS was used to determine the intermediate and final products and study their degradation pathways.The main results of this study are as follows:（1）The DBDP system was used to separately remove CAP from water,and the maximum degradation rate was 92.26%after 100 minutes of discharge.Through single factor exploration,it can be concluded that when other parameters are controlled to be consistent,the system discharge voltage,carrier gas（air）flow rate,and CAP degradation rate are positively correlated,while the initial concentration of CAP is negatively correlated with degradation rate.（2）PAF-45 was prepared by hydrothermal method,Cu@PAF-45-COOH。Through characterization analysis,it can be concluded that PAF-45 has a significant high surface area and complex pore structure,which is load coupled Cu@PAF-45-COOH On the basis of well-developed PAF-45 pores,it overcomes the defects of aromatic main chains,enhances photocatalytic performance,and increases the adsorption capacity for active particles such as CAP particles and superoxide radicals,which is conducive to improving removal efficiency.（3）Through the exploration of DBDP synergistic catalytic degradation of CAP in water,it was found that the removal rate of CAP is similar to that of PAF-45Cu@PAF-45-COOH There is a positive correlation between the dosage.By comparison,it was found that the DBDP collaborative PAF-45 system improved the removal rate by 24.39%compared to the single discharge system;DBDP Collaboration Cu@PAF-45-COOH The removal efficiency of the system is significantly higher than that of the single discharge system and the PAF-45synergistic system,with removal rates increased by about 30%and 10%respectively;Meanwhile,research has found that a mass ratio of 1:1 Cu@PAF-45-COOH Composite materials exhibit the best performance.（4）Based on the analysis of LC-MS detection results,it is believed that the main sites for the structural damage of chloramphenicol are the amide group and the benzene ring.Roughly,the oxidation of the carboxyl group on the benzene ring of chloramphenicol causes the C-Cl bond to break,leading to the dechlorination of the chloramphenicol structure and the removal of biological toxicity;The obtained product undergoes a series of nitro reduction processes such as denitrification and deoxidation,further breaking and finally oxidizing and ring opening degradation to obtain particles such as H₂O,CO₃^2-,NO₃^-,Cl^-.