Controlled Preparation Of Iron-Based Nanocomposite Fibers And Photocatalytic Performance

With the continuous development of society,environmental problems are becoming more and more serious and the treatment of pollutants has become a top priority.Photo-Fenton degradation technology,as a green,recyclable and efficient advanced oxidation technology,can decompose different pollutants into carbon dioxide and water.Therefore,in recent years,the synthesis of novel photo-Fenton catalysts has become a research direction for many researchers.The degradation performance is related to the light absorption range of the synthesized composite photocatalysts,the environment they are exposed to,and the concentration of added H₂O₂ .In order to improve the photocatalytic performance,this paper modified graphene oxide（GO）by compounding it with cobalt（CoFe₂O₄）and nickel（NiFe₂O₄）ferrate to further improve the photo-Fenton catalytic degradation performance.In this paper,two different spinel iron oxide nanofibers were prepared by electrostatic spinning technique,and different AFe₂O₄/GO composite photocatalyst materials were prepared by ultrasonic compounding method,and different analytical characterization methods were used to verify the corresponding degradation efficiency and to investigate the photo-Fenton degradation mechanism,the main work is as follows.（1）Using rhodamine B（Rh B）as the target pollutant,the photo-Fenton degradation performance of different GO ratios compounded with CoFe₂O₄（CFO）was investigated at different pH environments and with different concentrations of H₂O₂ added.The experimental results showed that CFO/GO-0.1%had the best photo-Fenton degradation performance after90 min of light exposure at pH=7 and 200μL of H₂O₂ addition.A series of characterization data and experimental results were used to investigate the reasons for the differences in the performance of catalysts with different compound ratios,and the analysis revealed that the catalysts with appropriate compound ratios had stronger light absorption performance,which effectively enhanced their photo-Fenton catalytic degradation performance.（2）Also using rhodamine B（Rh B）as the target pollutant,the photo-Fenton degradation performance of different GO ratios compounded with NiFe₂O₄（NFO）was investigated at different pH environments and with different concentrations of H₂O₂ added.The experimental results showed that NFO/GO-0.15%had the best photo-Fenton degradation performance after90 min of light exposure at pH=7 and 200μL of H₂O₂ addition.A series of characterization data and experimental results were used to investigate the reasons for the differences in the performance of catalysts with different compound ratios,and the analysis revealed that the catalysts with appropriate compound ratios had stronger light absorption performance,which effectively enhanced their photo-Fenton catalytic degradation performance.By compounding two iron oxides with GO,the separation rate of photogenerated electron-hole pairs was effectively enhanced,thus effectively improving the photo-Fenton degradation efficiency.In summary,the research work described in this thesis provides some theoretical and practical references for the development and modification of high-efficiency photo-Fenton catalysts and the study of the photo-Fenton degradation mechanism.