The Research On Structure Of MOFs-derived CuCo/C Catalyst And The Degradation Of Ciprofloxacin By Activated PMS

Over the years,the abuse,improper use and unconscionable post-use treatment of antibiotics often appear all around us,which also leads to a large number of antibiotic pollutants into the water environment,causing serious pollution of the water,but also bring irreversible harm to our ecosystem.However,there are some problems such as incomplete removal,secondary pollution and high cost in the current treatment process of sewage treatment plants,thus,it is difficult to make antibiotics harmless in water.Advanced oxidation technology（AOPs）is a sewage treatment method that generates strong oxidizing free radicals in the catalytic process.Free radicals act as oxidants to degrade antibiotics in water into small molecules with low toxicity or to form into CO₂ and H₂O.Among them,metal-organic frameworks（MOFs）are favored by researchers because of their adjustable chemical structure and abundant active sites.Based on this,in this study,Cu@Co-MOF-71（named as Cu@Co-MOF in the article）was used as the precursor to synthesize a highly efficient and easily recycled CuCo/C catalyst by one-step carbonization method,and the prepared catalyst was used for catalytic degradation of ciprofloxacin,and the entire catalytic degradation process was explored in depth.The detailed research contents are as follows:（1）Cu@Co-MOFs precursor was prepared by simple one-step hydrothermal method,and then CuCo/C composite catalyst was prepared by high-temperature pyrolysis under the protection of N₂.The catalysts were characterized through XRD,SEM,TEM and BET to analyze the crystallization chemistry,morphology and specific surface area.In addition,FT-IR,XPS and Raman spectroscopy were utilized to analyse and verify the chemical composition,functional groups and graphitization degree of the catalyst.These results illustrated that the prepared material is successfully synthesized and had excellent catalytic performance.（2）In this study,catalytic performance and reusability of CuCo/C catalyst were investigated by activating PMS to degrade CIP pollutants.The results show that the degradation efficiency of CuCo/C can reach 90%in 30min,which is significantly higher than that of Cu@Co-MOFs and Co/C,indicating that the catalytic activity of MOFs-derived metallic carbon materials is improved,and the catalytic performance of bimetallic catalytic materials is better than that of single metal.（3）In this study,we discussed the influence of p H,the amount of catalyst and PMS,temperature,co-existing inorganic anions and CIP concentration on CIP degradation.Four cycle degradation experiments and the leakage of metal ions in the reaction system were carried out to further illustrate the recyclability and stability of the prepared materials.In addition,the intermediates of CIP in CuCo/C+PMS system and the possible degradation pathway were obtained by HPLC-MS/MS.ESR and radical quenching experiments have also proved that the degradation of CIP in the catalytic system is due to both the existence of free radicals（SO₄^-·,OH·and O₂^-·）and the no free radicals of singlet oxygen（¹O₂）.In this work,a simple synthesis method of metal-organic frameworks（MOFs）derived catalyst and its application in the treatment of organic pollutants are presented.