Preparation Of Polycarboxylic Acid-based Organic Framework Materials And Study On The Adsorption Of C₂H₂

As one of the most widely used gases in industry,the storage,separation and purification of acetylene has always been a problem affecting its industrial process.In this regard,the advantages of solid material adsorption separation technology,such as safety and high efficiency,have attracted extensive attention of a large number of scholars,and the key of its technology is the development of high efficient adsorption materials.In recent years,metal-organic framework materials（MOFs）,as a new type of porous materials with the characteristics of design and functionability,have been widely used in many industrial fields.In particular,metal-organic framework materials have shown good application prospects in the adsorption and separation of acetylene.In this paper,the main preparation for more than several kinds of carboxylic acid base metal organic skeleton materials and its modified materials,on the characterization of the test,and through the study materials under different conditions on the adsorption performance of acetylene gas,which is concluded to be effective in adsorption of acetylene gas metal organic skeleton materials,on the basis of the material to test the stability,to further explore the practical value of the material.The main work of this paper is as follows:（1）Three metal-organic skeleton materials,UIO-66,UIO-66-（COOH）₂ and UIO-66-NH₂,were synthesized by hydrothermal synthesis method.Through structural analysis,it was found that the three materials had similar crystal structure.In the specific surface area test,UIO-66-NH₂ material had the highest specific surface area.At the same time,combining the interaction between amino（-NH₂）and acetylene,the acid gas,it was measured that the UIO-66-NH₂material with the introduction of basic group（-NH₂）showed the best adsorption effect on acetylene gas.（2）Secondly,from the perspective of structural stability and preparation cost of MOF material,another polycarboxylic acid group material（M-gallate material）was selected to study its acetylene adsorption performance.M-gallate materials with different metal centers（Zn,Mn,Mg and Ni）were synthesized by in-situ synthesis method.The specific surface area of the materials was tested,and it was found that Mg-gallate had the highest specific surface area.The water contact angle of the material was also tested to compare the hydrophobic performance of the material,so as to explore the practicability of the material.This paper systematically analyzed and compared the adsorption properties of several different polycarboxylic acid based MOF materials and their modified materials for acetylene gas,and explored the interaction principle with acetylene gas from the molecular structure of the materials,and further compared and screened out MOF materials that can efficiently adsorb acetylene gas and ensure the stability of the materials.This study provides a theoretical basis for the design and application of new high-efficiency MOF materials,and promotes the development of MOF materials in this field in the future.