Preparation And Application Of Zirconium And Cobalt Metal Organic Framework/Carbon Composite

Metal organic framework(MOF)is a crystalline material which assembled by metal cation or metal cluster and an organic ligand.It has unique properties such as high porosity,large specific surface area,and adjustable work.So far,various MOF materials have been successfully used in the fields of gas separation,catalysis,sensors,supercapacitos and so on.However,the shortcomings of MOF materials were also found in some studies,mainly focused on their poor chemical stability and electrical conductivity.In order to improve these important properties,different functional materials(carbon materials)and metal nanoparticles particles)have been combined with MOF to form new composite materials.These materials not only did not destroy the original MOF morphology.Moreover,it has given new functions to the materials and expanded the range of application.In this thesis,zirconium-MOF(MOF-801)and cobalt-MOF(ZIF-9)were respectively compounded with mesoporous carbon(MC)and carbon spheres(Cs)with different morphologies to obtain a composite material MOF-801/MC and ZIF-9/Cs.The morphological characteristics of the obtained composite materials were studied thugh a series of characterizations,and they were modified on glassy carbon electrodes for electrochemical detection.Finally,their detection in actual samples was evaluated.The specific work of the paper is as follows:1.For the first time,a composite of MOF-801 and mesoporous carbon(MC)was successfully prepared by a simple hydrothermal method and applied to electrochemical detection-luteolin and gallic acid(GA).First,we performed a series of characterizations for the composite material.The results indicate that the addition of MC not only limits the size of MOF-801,but also enables the composite material to obtain a large specific surface area and good electrical conductivity.At the same time,we optimized the carbon content of the composite material to obtain the best carbon content,and named it MOF-801/MC-3.Finally,under the best experimental conditions,the MOF-801/MC-3-based electrochemical sensor showed excellent performance for the electrochemical oxidation of luteolin and the electrochemical reduction of GA.MOF-801/MC-3/GCE was used to detect GA and luteolin in green tea and urine,respectively,with satisfactory results.This work has been published in the Journal of Electroanalytical Chemistry.This work has been published in ? Journal of Electroanalytical Chemistry?.2.ZIF-9/Cs composites were synthesized by solvothermal method,and a series of composites were obtained by adjusting the ratio of ZIF-9 and Cs.These composites have improved specific surface area and electrical conductivity compared to pure ZIF-9 materials.The electrocatalytic performance of the prepared ZIF-9/Cs/GCE for the electrochemical reduction of metronidazole(MNZ)and flutamide(FLU)is higher than that of ZIF-9.ZIF-9/Cs-2/GCE was used to detect MNZ and FLU with a wider linear range and higher sensitivity.We also studied the electrocatalytic mechanism of MNZ and FLU on ZIF-9/Cs-2/GCE.In addition,the sensor has been used to the detection of MNZ and FLU in serum samples.