Iron-based Oxides@Active Carbonwith Optical Assisted Fenton Technology For Treatment Of Tetracycline Wastewater

The widespread application of antibiotics in the medical and veterinary industries,and the discharge of industrial wastewater is the main source of antibiotic wastewater.Tetracycline antibiotics are widely used in the prevention and control of human diseases and infectious diseases in animals due to their low price and broad antibacterial spectrum,or they are added to animal feeds as growth promoters.It is necessary to remove the harm of tetracycline antibiotic contamination.Among AOPs,Fenton,Fenton-like,and photo-Fenton-like catalytic oxidation technologies have been used as effective methods to degrade and mineralize organic pollutants.Compared with the Fenton-like process,the photo-Fenton-like catalytic oxidation technology has a faster oxidation rate.This article is based on photo-assisted Fenton-like catalytic oxidation technology.A Fe₃O₄/activated carbon catalyst capable of efficiently degrading tetracycline,reusable,and magnetically recovered was successfully prepared.The catalyst materials were characterized and tested to reveal the relationship between the material properties and the catalytic oxidation process.A photo-Fenton-like catalytic oxidation system using Fe₃O₄/activated carbon as a catalyst was established,and the mechanism model of tetracycline degradation was explored.XRD,XPS,SEM,EDS,TEM,UV-vis DRS,BET and VSM were used to characterize Fe₃O₄/activated carbon and its various properties.The material has a mesoporous structure,has a large specific surface area,can be recovered by an external magnetic field,and has strong chemical stability.Based on this material,a photo-Fenton-like catalytic oxidation system targeting tetracycline simulated wastewater is established.The single-factor experiment determined the room temperature condition?22±1??.The best experimental conditions were an initial tetracycline concentration of 50 mg/L,a pH of 7.0,an H₂O₂ dosage of 10 mmol/L,and an Fe₃O₄/activated carbon dosage of 0.3 g/L.The system was validated for the efficient degradation of tetracycline and its kinetic analysis was performed.Its quasi-first-order kinetic constant was 0.10647 min^-1.It is clear that the main body of the photo-assisted Fenton-type catalytic oxidation system is the oxidation reaction dominated by the hydroxyl radical HO?.