Study On Construction Of Fe Based Photocatalyst And Removal Of Tetracycline

Nowadays,with the rapid development of China’s social economy,people’s living standards are also constantly improving.Therefore,people are not only satisfied with food and clothing,but also put forward higher requirements for health and safety.Antibiotics are indispensable in daily life,which can help people get rid of the disease.However,the compositions of wastewater in the process of preparing antibiotics are complex and the pH fluctuates greatly,which will produce certain toxic effects on microorganisms in the environment.In addition to the antibiotic wastewater produced in the preparation process,the human body can’t effectively absorb about 95%of the antibiotics and enter the environment through human excreta.Therefore,a large amount of antibiotic wastewater is discharged into the water body and its characteristics greatly raise the difficulty of the treatment process.At the same time,it also increases the burden of sewage treatment.Subsequently,researchers find that semiconductor photocatalysis technology can not only use solar energy to effectively treat water antibiotics,but also can hardly cause secondary pollution to the surrounding water.Therefore,iron-based semiconductor photocatalysis materials were studied in this paper.By constructing nano interface to reduce the recombination of photo generated carriers and form carbon layer,the transfer efficiency of photo generated electrons was effectively improved.In addition,different cations were introduced to regulate the potential of the guide band and valence band to degrade the target pollutants.Then,the photocatalytic materials were characterized in a series.Through the degradation of methylene blue（MB）dye and tetracycline（TC）wastewater,the catalytic performance and existing mechanism of photocatalyst were evaluated.Besides,the charge transfer of active substances and the relationship between them were also analyzed.The main research contents were as follows:（1）The Z-type Fe₂O₃@Ag-ZnO@C heterogeneous structure was designed and synthesized by using Fe-MOFs as precursor.The experimental results showed that Fe₂O₃@ZnO nano interface could reduce the recombination of photogenerated carriers,the carbon layer effectively improved the transfer efficiency of photogenerated electrons and provided more active sites for the reaction.In addition,the treated water quality after a series of cell biology experiments exhibited that the discharged wastewater would not cause harm to the environment,which was of great significance to the practical application of green environmental protection.（2）Different cations were introduced into Fe₂O₃/ZnO to adjust the potential of conduction band and valence band.The experimental results demonstrated that the synthesis method was conducive to accelerating the recombination of photogenerated electrons in the conduction band of Cu-Fe₂O₃ and holes in the valence band of Ni-ZnO,thus facilitating the redox reaction between the remaining holes in the valence band of Cu-Fe₂O₃ and the remaining photogenerated electrons in the conduction band of Ni-ZnO,so as to achieve the purpose of degrading tetracycline in water.Its excellent photocatalytic activity came from the doping energy level,which enhanced the separation of photocarrier charge and the formation of reactive free radicals（ROS）.