Investigation of Fenton-like catalytic degradation of oxytetracycline by copper-cysteamine complex
The presence of oxytetracycline residue in water poses a significant health risk to humans.Utilizing Fenton-like catalytic degradation technology proves to be an effective method for oxytetracycline removal from water.Copper-cysteamine complexes(Cu-Cy-I)were synthesized using water bath elevated temperature synthesis and characterized for morphology,structure,and chemical composition using Scanning Electron Microscopy(SEM),X-ray Diffractometry(XRD),and X-ray Photoelectron Spectroscopy(XPS).SEM analysis revealed that the synthesized Cu-Cy-I exhibited a predominantly rectangular lamellar structure,varying in size.XRD analysis indicated diffraction peaks at diffraction angles 2θ of approximately 10° and 24.05°.XPS analysis confirmed the presence of Cu,I,N,C,Cl,S,and other elements within the Cu-Cy-I material.Four antibiotics,including tetracycline hydrochloride,gentamycin,doxycycline hydrochloride,and oxytetracycline,were screened to select oxytetracycline as the target for degradation experiments.The degradation effect of Cu-Cy-I on oxytetracycline was studied by investigating various parameters such as light exposure time,H2O2 concentration,solution pH,catalyst dosage,initial solution concentration,and light source.Additionally,the study aimed to explore the degradation mechanism.Under neutral conditions,the degradation rate of 100 mL of oxytetracycline with an initial concentration of 100 mg/L,20 mg of Cu-Cy-I catalyst,and 0.025 mol/L of H2O2 reached 99.0％after irradiation under a high-pressure mercury lamp for 100 minutes.Even after three cycles of use,the degradation effect remained substantial,demonstrating excellent stability.Free radical trapping experiments were employed to identify the active free radicals in the Cu-Cy-I/H2O2 system.Results indicated the collaboration of hydroxyl radicals(·OH),superoxide radicals(·O2-),and photogenerated holes(h+)in promoting the degradation of oxytetracycline.The Cu-Cy-I catalyst synthesized in this study exhibited significant efficacy in oxytetracycline degradation,presenting a novel approach for antibiotic wastewater treatment.
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