Electrochemical Synthesis Of UIO-66-NH₂ And Fluorescence Detection Performance

Metal-Organic Frameworks?MOFs?are a new type of material in current scientific research.Because of its high specific surface area and abundant pores,the material is favored by researchers and widely used in many fields such as gas storage,catalysis and detection.At the same time,the method of synthesizing MOFs materials is also advancing with the times.In the traditional synthesis methods,there are shortcomings such as long time consumption,high energy consumption and large safety hazards.Among them,the electrochemical method has become a hot spot in this field because of its advantages of clean and environmental protection,mild conditions,simple operation,short time consumption and low energy consumption.In this paper,the electrochemical method is used to use metal zirconium wire as the metal source,2-aminoterephthalic acid as the organic ligand,tetrabutylammonium bromide as the conductive salt,and a mixed solution of N,N-dimethylformamide and acetic acid.UIO-66-NH₂ materials were synthesized at room temperature and atmospheric pressure by applied DC voltage.In the experiment,a series of products were obtained by changing the solvent ratio,reaction voltage and reaction time respectively.The obtained products were characterized by XRD and SEM,and the structure and morphology of the materials under different reaction conditions were analyzed.When the volume ratio of N,N-dimethylformamide to acetic acid is 52:8,the applied DC voltage is4 V,and the material synthesis time is 1 h,the obtained UIO-66-NH₂ material has higher crystallinity and The shape is uniform and small.Furthermore,FT-IR characterization was used to characterize the composites.The structure and coordination mode of the groups were analyzed and determined.The results showed that the synthesized materials were stable in structure.In order to study the fluorescence detection performance of UIO-66-NH₂,this experiment selected UIO-66-NH₂ synthesized under optimal conditions to detect the metal ions in water.Selective test,test performance test,anti-interference test and cycle stability test were carried out,and the fluorescence characteristics and fluorescence mechanism were analyzed.The results show that the electrochemically synthesized UIO-66-NH₂ has maximum absorption at 360 nm,can emit fluorescence with a wavelength of 460 nm,and has a significant quenching effect on the fluorescence of Fe³⁺in water to UIO-66-NH₂.The detected UIO-66-NH₂ has a detection limit of 10^-8 mol/L for Fe³⁺,and has good selectivity,anti-interference and cycle stability.Through research,the detection mechanism is the result of the interaction of electron transfer and resonance energy transfer.In addition,the factors affecting the yield of UIO-66-NH₂ synthesized by electrochemistry were also analyzed,and the detection limits of Fe³⁺in water were compared with UIO-66-NH₂ synthesized by solvothermal method.According to the analysis,the yield of UIO-66-NH₂synthesized by electrochemical method is about 11 times that of solvothermal method,and the electrochemically synthesized UIO-66-NH₂ has better detection ability for Fe³⁺than solvothermal synthesis.The ability to detect Fe³⁺.In summary,the electrochemical synthesis of MOFs materials has unique advantages in the synthesis process and detection performance,and has a bright future.