Preparation Of MOFs-derived Materials And Their Application In Electroanalysis And Enzyme-like Catalysis

Due to the controllable composition,structure and pore size,the emergence of metal organic frameworks?MOFs?has attracted widespread attention in many fields,such as catalysis,energy storage and conversion,sensors and environmental engineering.Porous carbon,metal oxide,metal phosphide and metal/carbon and other derived materials prepared by using MOFs as precursors.They can not only inherit the advantages of MOFs,but also exhibit excellent characteristics,and have become an important field in multifunctional nanomaterials.Herein,based on ZIF-8 and MOF-74,we have synthesized porous carbon/reduced graphene oxide composites and CoMn-bimetallic oxide respectively,and studied their applications in electrochemical and enzymatic catalysis.In the first experiment,porous carbon was prepared from a zeolitic imidazolate framework?type ZIF-8?by carbonization at 800°C?Z-800?.A hybrid material was then obtained by direct co-electrodeposition of Z-800 with graphene oxide?Z-800/rGO?.Z-800 is N-doped with good electrical conductivity and displays electrocatalytic activity.Z-800 readily undergoes mass transfer and also prevents graphene to agglomerate during electroanalysis.The hybrid was placed on a glassy carbon electrode?GCE?to obtain an electrochemical sensor for chloramphenicol?CAP?detection.In our preception,the method has a wide scope in that it may be applied to the preparation of various kinds of other?doped?porous carbon/rGO composites for use in?bio?chemical sensors.In the second experiment,we first synthesized the bimetallic MnCo-MOF-74,and then used it as a precursor to calcine at 300°C for 4 h in the air atmosphere to obtain the final bimetal oxide Mn/CoO-C.Based on Mn/CoO-C,we constructed a two-platform enzyme-free detection system for H₂O₂ electrochemical and colorimetric.In addition,Mn/CoO-C also has the catalytic activity for glucose oxidase,which can be used as a"tandem enzyme"to catalyze the cascade reaction of glucose and TMB for colorimetric detection of glucose.Compared to the single metal Co-oxide,Mn/CoO-C exhibits higher catalytic activity,which is related to the coupling between the bimetals.