Preparation And Characterization Of Metal-Organic Frameworks And Their Composites

Metal-organic frameworks (MOFs) built from metal ions and polyfunctional organic ligands have attracted considerable attention due to their intriguing structures and potential application in gas storage, molecule separation, chemical sensing, catalysis, drug delivery. With its organic functional groups, and easy to adjust the metal node, more and more MOFs have been synthesized. However, the current development of MOFs application is far from enough for its great application value. In order to expand the application scope of this material, MOFs based composite materials as well as the template for MOFs derivatives were prepared.In recent years, more and more magnetic MOFs materials have been synthesized due to its properties of porous and magnetic. The structures of MOF materials have potential use in the areas of recycle catalyst, magnetic separation, magnetic resonance imaging. In this thesis, we have synthesized magnetic MOF materials and verified its application in organic catalysis. Meanwhile for the wide use of MOF materials, we obtained MOFs derivatives which possess good photocatalytic performance by calcining. MOFs in different air conditions. The main contents of this thesis are as follows:1. With the development of technology, water pollution become more and more serious in which heavy metal ions pollution is the most prominent. How to solve this issue has become a big problem for the scientists. In this paper we have synthesized rod-like CaMOFs through traditional hydrothermal method.We discovered that it can remove most of the heavy metal ions in wastewater by ion exchange method. It offers the possibility of industrial of removal heavy metal ions from wastewater with tremendous exchange capacity and easier synthesis method.2. MOFs are widely used by scientists as a catalytic material for their high catalytic activity, more catalytic points, and stablility in structure. However, most of the organic catalysts have drawbacks such as more cumbersome in terms of recycling. In this paper we synthesized a magnetic metal organic framework materials (Fe3O4/MOF), which provides a broader platform for the application of MOFs, at the same time we found that the introduction of magnetic materials can improve to some extent the rate of oxidation of benzyl alcohol, which provides a possibility for industrial catalysis.3. MOFs with nano-sized features and supramolecular structures are ideal candidates for precursors in solid state calcination processes to fabricate nano-sized metal and metal oxides with novel structures and properties. Magnetic nanocomposites with a core/shell structure have been successfully synthesized via direct calcinations of magnetic MOFs in different atmosphere. Fe3O4@C/Cu nanocomposites show more powerful photocatalytic activity for the degradation of methylene blue under visible light irradiation in the presence of H2O2. Meanwhile, the catalyst is stable during the reaction and the high Ms value of the as-prepared magnetic composites is favorable for the separation and recycling of the catalyst from the reaction media after the catalytic reactions.