Study Of Cu-Mn Bimetal Catalysts For The Activation Of Persulfate To Degrade Antibiotics

In recent years,advanced oxidation technology based on persulfate has been extensively studied in the field of wastewater treatment.Cu and Mn-based materials have been widely studied in the field of persulfate catalyzed degradation of antibiotics due to their advantages of low toxicity and high abundance.Single transition metal oxide ion leaching is high,and the formation of high-valence species during the reaction results in poor recycling and low activity.In this study,a Cu-Mn bimetal catalyst was constructed to efficiently activate persulfate for the degradation of antibiotics.The main research contents are as follows:（1）Cu²⁺significantly promoted the degradation of levofloxacin（LVF）and other pollutants by Mn O₂-activated permonosulfate（PMS）.When 20μM Cu²⁺was added to the solution,the degradation rate of levofloxacin under neutral conditions was 37 times higher than that of the Mn O₂ catalyst alone.By X-ray energy spectrum,new Cuprous reagent and sodium periodate detection method,it was found that the surface of the catalyst where Cu²⁺adsorbed to Mn O₂ in the solution was transformed into Cu（Ⅰ）,and Cu（Ⅰ）interacted with PMS to form highly active Cu（Ⅲ）.Cu（Ⅲ）was the main active species in the degradation of pollutants in the system.The introduction of Mn O₂effectively enhanced the redox cycle of Cu（Ⅰ）/Cu（Ⅱ）/Cu（Ⅲ）,and promoted the activation of PMS.（2）Cu₂O is the most typical heterogeneous Cu（I）-based catalyst,but its activity and stability need to be improved.Cu₂O-Mn₃O₄ bimetallic nanoparticles were prepared by a simple coprecipitation method for activated perdisulfate（PDS）degradation of tetracycline hydrochloride（TC）.The presence of Mn₃O₄ in the catalyst decreases the particle size and increases the electron density of Cu₂O,and there is a strong Cu-Mn interaction.Cu₂O-Mn₃O₄ catalyst can remove 95%TC in water within 30 minutes,and the degradation rate is 16 times that of Cu₂O and 43 times that of Mn₃O₄,respectively.Cu（Ⅲ）was the main reactive species produced in the system,and the content of Cu（Ⅲ）produced in Cu₂O-Mn₃O₄/PDS system was significantly higher than that of Cu₂O alone.