Preparation Of Nitrogen-Doped Porous Carbon Supported Cobalt/Nickel Metal Nanomaterials From Metal-Organic Frameworks And Its Performace For Reduction Of Nitro

Porous carbon-based materials derived from Metal-Organic Frameworks（MOFs）have the characteristics of high specific surface,high porosity,high stability,N\P element doping,etc.,using MOFs as precursors to synthesize nanoporous carbon Materials are one of the hottest topics in the research field of new performance carbon-based porous materials.In this thesis,a series of new cobalt/nickel bimetallic nanomaterials Co_n/Ni@NPC-T（n is Co/Ni Molar ratio,T is the pyrolysis temperature）.The structure was characterized by PXRD,SEM,TEM,XPS,EDS and other series of methods,and its catalytic performance for the reduction of 16 nitro compounds with different functional groups to amines was studied in detail,and the new high-performance porous carbon was designed and synthesized in the future.Supporting non-noble metal nitro reduction catalyst provides new ideas:（1）Co_n/Ni@NPC-T has a honeycomb porous core-shell structure.Co/Ni nanoparticles with a diameter of about 18 nm are uniformly wrapped in Nitrogen-doped Porous Carbon（NPC）.The metal particles as the core are protected by the NPC shell,which avoids the contact and agglomeration of metal nanoparticles and the leaching of metal during the catalytic process,which greatly improves the stability of the material.（2）The synthesized cobalt/nickel bimetallic nanomaterial Co₅/Ni@NPC-700 under mild conditions（hydrazine hydrate as the hydrogen source,ethanol as the solvent,25℃,0.1-0.5 hours and 1 atm）,with different 16 kinds of nitro compounds that can competitively reduce functional groups（such as halogen groups,carbon groups,aldehyde groups,ester groups,olefins and nitrile groups,etc.）,exhibit excellent catalytic reduction performance:high conversion rate（>99%）,Good selectivity（～100%）,strong stability and excellent recyclability（can be reused at least six times without significant loss of catalytic activity）.（3）The excellent catalytic activity of Co₅/Ni@NPC-700 may be synergistic with Co/Ni bimetallic nanoparticles,the porous and stable core-shell structure of the catalyst,and the medium BET surface area and more accessible active sites And so on.In addition,this thesis also designed and synthesized a hydroxyl-modified rth-ty pe topological porous MOF material HNUST-13 by using a triethylenediamine-pentah ydroxyisophthalic acid mixed ligand and copper ion coordination.Single crystal diffr action,X-ray powder diffraction,IR,TGA and other methods have detailed the struc ture of the material.HNUST-13 p-methylene blue（MB）,rhodamine B（Rh B）,methyl orange（MO）,Congo red（CR）,the adsorption behavior of Sudan II and Sudan III dyes in DMF solution.The results show that:HNUST-13 is formed by the coordina tion of Cu-paddlewheel secondary building units with triethylenediamine and pentahy droxyisophthalic acid.The three types of polyhedrons（rectangular octahedron,truncat ed octahedron and truncated tetrahedron）pass the coplanar porous frame material in a ratio of 1:2:1.HNUST-13 shows good adsorption performance for dyes such as C ongo Red（CR）and Sudan II in DMF solution at room temperature.