Preparation And Properties Investigation Of Metal-Organic Frameworks And Their Composites

Metal-organic frameworks(MOFs)are a new type of multifunctional materials that have developed rapidly over the past decade.MOFs have the characteristics of large specific surface area,high porosity,regular and open pores,rich functional groups and structural diversity,which make them show great development potential and attractive application prospects in modern materials research.MOFs are composed of metal ions/clusters and organic ligands,so in order to design and synthesize MOFs materials with special structures and properties,rational selection of metal and organic ligands is crucial.In this dissertation,prepared MOFs and their composites to study their performance in fluorescence sensing,gas adsorption,and photocatalysis.The optimal performance is achieved by rationally regulating organic ligands and metal building blocks.By choosing different ligand synthesis strategies and regulating the types of metal moieties,synthesized three MOFs materials,and carried out characterization,testing and analysis of these MOFs materials.Chapter 1:The related properties and synthesis methods of MOFs materials are introduced,and the basis and significance of the topic selection of this paper as well as the main results of the research are briefly described.Chapter 2:A scu-type polyoxometalate-based Cu(II)-MOF material with excellent acid-base stability was obtained by using bifunctional ligand strategy,and its photocatalytic degradation performance of organic dye in aqueous system was also studied.Chapter 3:A ths-type microporous In(III)-MOF material with double interpenetrating structure was prepared by using acid-acid mixed ligand strategy.Considering that the material has one-dimensional pore environment modified by fluorine atoms,its selective adsorption and separation performance of acetylene and ethane gas was studied.Chapter 4:A trinuclear{Cd₃(OH)}⁵⁺cluster-based MOF material with pacs-type topology was synthesized by using acid-base mixed ligand strategy,and its selective adsorption of acetylene and carbon dioxide gas and recognition behavior of nitroaromatic compounds were investigated.