Preparation Of Non-ferrous Fenton-like Catalyst And Study On The Degradation Of Ciprofloxacin

In recent years,antibiotic pollution has attracted increasing attention due to its harmful effects on ecosystems and human health.Ciprofloxacin（CIP）is one of the most common antibiotics in human and veterinary medicine,active against a variety of bacteria.However,the residual CIP in the environment was difficult to be removed by traditional wastewater treatment technology.Currently,advanced oxidation technology is commonly used in the industry to treat organic pollutants in wastewater.Among them,electric Fenton technology has been widely concerned for its advantages of easy operation,short reaction time and high degradation efficiency.It is vital to design efficient catalysts achieve efficient degradation effects.Aiming at the disadvantages of traditional iron-based catalysts that are prone to produce iron sludge and secondary pollution to the environment,this study designed two non-ferrous based Fenton catalysts.The main contents and conclusions are as follows:1.Zn O-Ce O₂ catalyst was prepared by electrochemical deposition.The microscopic morphology of the material was characterized by scanning electron microscope（SEM）.X-ray powder diffraction（XRD）and BET isothermal adsorption tests were carried out on the crystal structure and specific surface area of the materials,respectively.In addition,X-ray photoelectron spectroscopy（XPS）was used to analyze the valence state and composition of the constituent elements on the catalyst surface,indicating that the Ce element had two valence states of+3 and+4.The electrochemical performance of the composite material Zn O-Ce O₂ was studied by CV and EIS tests.2.In the Fenton-like degradation system of Zn O-Ce O₂ catalyst,the influence factors of degradation were investigated.It was found that when the deposition time was600 s,the initial p H was 3,and the degradation applied voltage was 4 V,the best degradation effect was achieved.After 2 h,the degradation effect reached 99%,and the TOC removal rate reached 82%.The degradation effect could still achieve higher than 96%after 10 cycles,indicating that the material had good stability performance.3.A series of Cu doped La Co O₃ catalysts with different ratios were prepared by sol-gel method by using citric acid as organic complexing agent,and the materials were characterized by SEM,XRD,and XPS tests,which proved the successful preparation of the materials.Through XPS characterization,it could be found that there were two valence states of Co element and Cu element,respectively.4.In the Fenton-like degradation system of Cu doped La Co O₃ catalysts,experimental investigations had found that when the doping amount of Cu was 60%,the dosage of the catalyst were 5 mg,and the initial p H was 3,the degradation effect reached the best.After CIP degradation for 2 h,the degradation efficiency reached 99%,and the TOC removal rate was 83%.It was found that after 5 times cycles,the degradation efficiency was still higher than 90%,indicating that the catalyst material had better stable performance.5.Through the investigation of the active reactive species during the experiments,it was found that the hydroxyl radicals played the main role in the Fenton-like degradation systems of Zn O-Ce O₂ catalyst and Cu doped La Co O₃ catalysts.