Preparation And Application Of Fe-based Bimetallic MOFs Material

With the growth of population and the acceleration of industrialization,the discharge of organic and inorganic pollutants is increasing,resulting in serious pollution of freshwater resources,and wastewater purification has become particularly important.Some pollutants in industrial wastewater can be removed by physical and biodegradation,but organic pollutants such as dyes,phenols and drugs are difficult to be eliminated by biodegradation due to their biological toxicity.Advanced oxidation processes（AOPs）have the advantages of high mineralization rate and fast oxidation reaction rate,and become an ideal method for the treatment of organic wastewater.Fenton’s reagent(Fe²⁺/H₂O₂)based on ferrous ion catalysis,as one of the advanced oxidation technologies,has been extensively studied in recent years.Metal-organic frameworks（MOFs）are a class of porous crystalline materials formed by the coordination of metal ions and organic ligands.Due to their flexible chemical composition and structure,large surface area,and controllable pore size,they are widely used in gas storage,electrochemistry,catalysis,and biomedicine.There are a wide range of applications in the field.In this paper,based on Fe-based MOFs materials,Fe_0.1Cu-BDC and Fe/Co-MOFs bimetallic MOFs materials were synthesized by doping different metal ions into the synthesis system,which greatly improved the performance of Fe-based MOFs materials as Fen-like material.Catalytic performance of fenton catalyst for the removal of the dye Rhodamine B in aqueous solution.A series of Fe/Cu bimetallic MOFs were synthesized by solvothermal method,in which Fe_0.1Cu-BDC catalyst catalyzed the degradation of Rhodamine B by hydrogen peroxide（H₂O₂）in aqueous solution.Under the condition of 35℃and p H=4,the decolorization rate of Rhodamine B can reach more than 95%within 60 minutes,and when the p H increases to 9,the decolorization rate is still more than 90%.At 65℃,the decolorization rate of Rhodamine B can reach 100%within 8 minutes.At the same time,the catalyst has good stability,and the decolorization rate of Rhodamine B is still more than 90%after repeated use for 6 times.The solvothermally synthesized Fe/Co bimetallic MOFs material Fe/Co-MOFs catalyzes the degradation of Rhodamine B by hydrogen peroxide（H₂O₂）in aqueous solution.Under the condition of 35℃,in a wide p H range（p H=5～11）,the decolorization can reach 100%within 30 minutes.The study of the catalytic reaction mechanism by free radical capture experiment showed that under the catalysis of Fe/Co-MOFs,hydroxyl radical（·OH）and hole（H⁺）play a particularly important role in the degradation of Rhodamine B effect.