Design,Synthesis And Fluorescence Sensing Properties Of Metal-Organic Framework Materials Containing Eu

Metal-organic frameworks?MOFs?is a very popular porous material developed in the past two or three decades,and has been widely used in many disciplines.Among them,Luminescent metal-organic frameworks?LMOFs?have the advantages of MOFs material structure and unique luminescent properties,which have been widely used in various types of sensing research.With the development of human society and the continuous progress of industry,more and more industrial pollution and environmental problems are exposed.Many toxic organic liquids and heavy metal ions have not been effectively treated,causing major hidden dangers to human health,so the detection of pollutants is very important.LMOFs materials exhibit excellent properties in terms of fluorescence sensing,and the development of new,efficient,and sensitive luminescent metal organic framework materials can be effectively used for environmental monitoring.In this paper,two Eu???based luminescent metal organic framework materials were designed and synthesized for fluorescent sensing detection of nitrobenzene and metallic copper ions:1.A case of Eu???-doped Zn-MOF?Zn₃?BTC?₂:Eu????was synthesized by solvothermal method using 1,3,5-benzenetricarboxylic acid,zinc nitrate hexahydrate and europium nitrate hexahydrate as raw materials.The optimal doping ratio was studied and the structure,morphology,composition,and fluorescent properties of the material were characterized in detail.The selectivity to a variety of small organic molecules was tested,and it was found that nitrobenzene has an obvious quenching effect on the luminescence of the material.Then the relationship between the fluorescence intensity of the material and the concentration of nitrobenzene was studied,and the corresponding fitting analysis was performed.The Zn₃?BTC?₂:Eu???can be used as a potential fluorescence sensor for fast and highly sensitive detection of trace amounts of nitrobenzene.2.A dual-ligand Eu-MOF material was synthesized by solvothermal method with1,3,5-benzenetricarboxylic acid,4,4'-azopyridine and europium nitrate hexahydrate.The Eu-MOF was characterized by X-ray diffractometer?XRD?,scanning electron microscope?SEM?,X-ray photoelectron spectroscopy?XPS?,thermogravimetric analysis?TG?,and the luminescence performance test.This material exhibits the characteristic emission of Eu???,and has good selectivity and sensitivity to nitrobenzene and copper ions,and can be used for fluorescence identification of trace nitrobenzene and copper ions in the liquid phase environment.This work provides a good choice for designing and synthesizing multifunctional fluorescent MOFs as fluorescent probes for selective detection of target analytes.