Modification Of Zinc Ferrite Material And Its Synergistic Properties Of Adsorption And Photocatalysis

Human beings are progressing,society is developing,and science is breaking through.There seem to be a lot of problems hidden under the seemingly good development situation.The most noteworthy of these is the environmental problem,and the water pollution in it has always been a problem we must face.At present,there are many methods used to solve this problem,in which clean and efficient photocatalytic degradation technology emerges as the times require,and researchers have become more concerned.This paper is dedicated to the preparation of highly efficient composite photocatalysts to improve the efficiency of organic pollutant removal.Through a series of characterizations,the elemental composition,structural characteristics and performance of the composites were analyzed.The specific research contents and results are as follows:?1?Preparation and properties of environmentally friendly and magnetically recyclable SnFe₂O₄/ZnFe₂O₄ heterojunction photocatalytic materials.In the preparation of the material,Fe?NO₃?₃·9H₂O was used as the iron source,Zn?NO₃?₂·6H₂O was used as the zinc source and SnCl₂·2H₂O was used as the tin source,which was synthesized by one-step solvothermal method.The performance experiments show that the 5%SnFe₂O₄/ZnFe₂O₄ heterojunction material has the highest photocatalytic performance,and the removal rate of tetracycline reaches93.2%,and it also has a good effect on the COD removal of the actual pharmaceutical wastewater due to its specific surface area.Compared with pure ZnFe₂O₄,the photogenerated electron-hole recombination rate is the smallest and the transfer efficiency of the two is also high.The stability of the SnFe₂O₄/ZnFe₂O₄heterojunction material is still high after four cycles of use.The photocatalytic activity,which is magnetic,makes the recovery during the recycling process very convenient;finally,the non-toxicity of the catalyst itself is confirmed by the activity test of the microorganism.?2?Preparation and application of ZnFe₂O₄/Bi₂S₃ composite photocatalyst.Based on the preparation of ZnFe₂O₄,Bi?NO₃?₃·5H₂O and thioacetamide were used as the source of lanthanum and sulfur.The ZnFe₂O₄/Bi₂S₃ composite photocatalytic materials with different ZnFe₂O₄ content were synthesized by two-step solvothermal method.All materials were tested for their photocatalytic properties by degrading the tetracycline solution.The results show that the 12%ZnFe₂O₄/Bi₂S₃ photocatalyst has the highest photocatalytic activity,and the addition of ZnFe₂O₄ material has a qualitative improvement on the performance of Bi₂S₃.It was analyzed that the addition of ZnFe₂O₄ increased the specific surface area of the composite and slowed down the recombination efficiency of photogenerated electrons and holes and increased their transfer rate.