Preparation Of SrTiO₃/MnFe₂O₄ Using Microwave Hydrothermal Method And Microwave-UV Catalytic Degradation Of Tetracycline In Water

The use of antibiotics has increased and the development of the antibiotic pharmaceutical industry has become more and more serious.The pollution of antibiotics and refractory organic pollutants has become more and more serious.In the advanced oxidation technology,microwave catalytic oxidation technology and photocatalytic oxidation technology have high efficiency in treating antibiotics and refractory organic substances.The advantages of short time and no secondary pollution of degradation products have become popular technologies in water environmental management research.This paper aims to combine the microwave catalytic oxidation technology with the photocatalytic oxidation technology,using the semiconductor material composite ferrite material as a catalyst,preparing the SrTiO₃/MnFe₂O₄ composite catalyst by microwave hydrothermal method,and degrading the water under the simultaneous irradiation of microwave and ultraviolet light.tetracycline.The XRD,SEM and FT-IR spectra of the prepared SrTiO₃,MnFe₂O₄,and SrTiO₃/MnFe₂O₄ were analyzed.The mass ratio of SrTiO₃ and MnFe₂O₄ to the activity of the catalyst was investigated under certain microwave hydrothermal synthesis time and synthesis pressure.influences.The main results are as follows:1.Under the condition of microwave hydrothermal pressure 1.5 Mpa,microwave hydrothermal time 30 min,SrTiO₃ and MnFe₂O₄ mass ratio of 1:1,the prepared catalyst SrTiO₃/MnFe₂O₄ shows the most.Higher catalytic activity.2.The degree of degradation of tetracycline increases with the increase of microwave power,treatment time and catalyst dosage.3.As the initial concentration of tetracycline increases,the degradation efficiency of tetracycline gradually decreases.4.After five repeated experiments,the composite catalyst SrTiO₃/MnFe₂O₄ showed a decrease of5.6%in catalytic activity,indicating that the catalyst has high stability.5.Active free radical capture experiments show that hydroxyl radicals,superoxide radicals and holes?·OH,·O₂^-and h⁺?are the main active species in the degradation system.In summary,the catalytic activity and stability of the novel SrTiO₃/MnFe₂O₄ composite catalyst are high,and microwave catalytic oxidation combined with photocatalysis technology has a good application prospect in the treatment of antibiotic wastewater.