The Construction Of Zn-MOFs Composites And Application For Detection

Metal-Organic Frameworks material is a kind of porous material with a variety of metal ions/clusters as metal nodes,functionalized organic ligands/ligands as bridges for connecting metal ions.It provides new ideas and paths for the modification and application of porous materials,and the cross fusion of organic and inorganic materials is realized.Nano-materials were considered as a hot materials for various research groups and brings new surprise to the research field and life.Composites consisting of nano-materials and metal-organic frameworks can broaden the scope of application.In this paper,a stable and functionalized composite materials composed of MOFs with zinc ions as metal nodes was used to the detection of organic pollutants and heavy metal ions.The content of this thesis mainly includes the following three aspects:(1)The dual-emission fluorescent metal-organic frameworks(MOFs)-based nanoprobe was prepared by encapsulating the fluorescein isothiocyanate FITC and Eu(III)complex-functionalized Fe3O4 into the zeolitic imidazolate framework materials(ZIF-8)for ultrasensitive ratiometric detection of copper ion.The core-shell-like nanoprobe exhibits a single excitation,dual-emission fluorescence property.In such a ratiometric fluorescent probe,a porous structure ZIF-8 as a protective layer can not only prevent the aggregation of the nanoparticles but also enrich the target analytes,resulting in amplify the fluorescence signal.FITC effective eliminates interference from environmental and human factors as a reference signal,which make the results of experiment more reliable.This dual-emission MOFs-based nanoprobe for Cu2+detection in real samples and Cu2+imaging in live cells were also investigated.(2)2D Au/H-MOF-5 nanosheet was obtained by supported gold nanoparticles in H-MOF-5 through in-situ reduction method,which can effective detect Hg2+.Au nanoparticles dispersed on H-MOF-5 nanosheet homogeneously,which effective avoid the nanoparticles to aggregate and guarantees the more active site.Two-dimensional H-MOF-5 nanosheet has a larger pore size and surface area compared to the cube MOF-5,which is beneficial to target analytes enrichment,thus improve the performance of the catalysis and sensing.The Au/H-MOF-5 composites can be used to detect Hg2+ in the Yellow River water and test paper application.(3)We Set up a simple and rapid method to detect nitrophenol.The synthesis of Zn-MOF-1with porous structure under room temperature conditions has low energy consumption.Zn-MOF-1 has the function of target enrichment and the size selectivity.The fluorescence probe was used to construct a specific response to p-nitrophenol based on interactions between organic ligands of MOFs and analytes.It was found that Zn-MOF-1 has good stability and excellent selectivity to p-nitrophenol with a wide linear range.