The Synthesis And Application Of MOFs Derived Metal Nanoparticles And N-doped Porous Carbons

Metal organic frameworks(MOFs)are composed of metal clusters and organic ligands through self-assembly together to build a new kind of porous crystal materials.Compared with the traditional porous materials,MOFs have high surface area and high porosity and other characteristics,which makes them have great potentials in energy storage,gas separation and catalysis and many other fields.On the other hand,due to the highly ordered porous skeleton structures of MOFs contain lots of organic ligands,MOFs are considered as the most ideal self-sacrifice templates for the derivation of the porous carbons at high temperature conditions.As MOFs are general adjustable,it can be easily designed and tuned by simply changing the metal nodes or organic ligands.When selecting stable metal ions(such as Fe,Co,Ni,etc)as the metal centers of the precursors,can prepare the porous carbon materials with metal nanoparticles embedded under the suitable thermal conditions.If the choice of volatile metal like Zn2+ centers or nitrogen containing organic ligands in the inert atmosphere can result in nitrogen-doped and metal-embedded porous carbons.In this paper,MOFs were used as templates to produce carbon coated metal particles or nitrogen doped porous carbon materials under different carbonization conditions,and their applications in the field of catalysis or dye adsorption were studied.In the second chapter,a series of multivariate MOFs based on JUC-160 were successfully synthesized by adjusting the ratio of Co/Zn,which can serve as the precursors to obtain a series of porous carbons with cobalt nanoparticles embedded.The resultant porous carbons were explored in the 4-nitrophenol catalytic progress,which showed that the carbons,derived from the metal center of JUC-160 precursor with Co/Zn ratio of 1/1,exhibited the highest catalytic activity and the best cycle stability.In the third chapter,we mainly used nanometer Zn-JUC160 as template for the preparation of N-doped porous carbons at high temperature surrounded by inert atmosphere,and study the adsorption capacity of the carbons for methylene blue.The nanometer Zn-JUC160 with Zn2+ as metal centers,which can flow away with the gas at the temperature higher than the boiling point by evaporation.While the organic ligands of Zn-JUC160 were benzimidazole and 2-methyl benzimidazole,thus can induce the N-doped porous carbon materials at high temperature.The nitrogen adsorption results showed that the nitrogen doped porous carbons,derived from thenanometer Zn-JUC160,possess high surface area and adjustable pore structures,which can improve their adsorption capacity.In the adsorption of methylene blue,the results showed that the nitrogen doped porous carbons prepared in this chapter have good methylene blue adsorption performance.In summary,selecting the suitable MOFs as the precursors would generate metal nanoparticles or nitrogen doped porous carbon carbons,according to the effective measures and carbonization conditions.The resulting products which used in catalytic or dye adsorption both showed the high potential.Therefore,this thesis not only provides an effective synthesis method of MOF-derived porous carbons,but also offered the research directions for the practical application of the products,which make it high academic significance and practical value.