Synthesis And Performance Of Functionalized MOFs For Selective Capture And Catalytic Conversion Of Carbon Dioxide

In the past decade,the concentration of carbon dioxide（CO₂）in the atmosphere has continued to increase,leading to global climate change,which is the most challenging problem of the 21st century.At the same time,CO₂ is an easily available,low-cost,and renewable C1 resource.Approaches to reducing anthropogenic CO₂emissions can eliminate CO₂ directly from point sources.About 60%of the world’s total CO₂ emissions can be attributed to electricity generation.Directly reacting CO₂in flue gas with epoxides to convert to five-membered cyclic carbonates is a promising strategy for CO₂ fixation,not only for reducing the environmental burden but also for mitigating energy in a low-cost,energy-efficient manner.Metal-organic frameworks（MOFs）are a class of rationally designed and constructed crystalline porous materials composed of organic linkers and inorganic nodes.By tuning the metal nodes and/or organic linkers,the physical and chemical properties of MOFs can be achieved.These properties make MOFs promising materials for low-concentration CO₂ capture and catalytic conversion.The main contents of this article are as follows:（1）By hydrothermal method,1,2,4 triazole（TZ）,3-amino-1,2,4 triazole（a TZ）and3,5-diamino 1,2,4 triazole（da TZ）with zinc fluoride tetrahydrate synthesized three isostructural MOFs,ZnF（TZ）,ZnF（a TZ）and ZnF（da TZ）.In the ZnF（a TZ）and ZnF（da TZ）,one and two amino groups were introduced,respectively,and the three materials showed good adsorption capacity and selectivity for CO₂,and under the condition of low concentration of CO₂,showed good adsorption capacity.The ability to catalyze cycloaddition reactions;（2）An In-MOF material with good selectivity for CO₂ and high adsorption capacity at low pressure was selected,and inexpensive metal aluminum of the same main group was added,and a one-pot synthesis method was used to mix two kinds of SUBs in each metal ions to synthesize a bimetallic MOFs material.By introducing an appropriate proportion of the second metal into the framework of MOFs,the partial substitution of metal ions induces changes in the porous structure and adsorption sites,which in turn affect the adsorption properties of gases.Synergistic effects can be produced that significantly alter the intrinsic properties of MOFs.This enables bimetallic MOFs to exhibit better performance for CO₂ adsorption,separation,and catalysis than monometallic MOFs in various applications.