Research On Preparation Of Metal-organic Framework Materials And Their Gas Separation And Adsorption Performance

The adsorption and separation of gas has always been a key issue that has been explored and urgently needed to be resolved in the industry.For example,hydrogen,as an ideal clean energy,is very promising to solve the current shortage of fossil fuels and other resources.Therefore,the purification and storage of hydrogen becomes a key issue.At the same time,carbon dioxide,as a harmful gas,has led to a series of negative effects such as the greenhouse effect and sea level rise.The capture of carbon dioxide has also become a hot area of research in recent years.Seeking a material that can efficiently separate H₂/CO₂and other mixed gases is the key to achieve carbon capture and purification of hydrogen before combustion.Traditional separation methods and adsorbent materials are widely used,but they always have different disadvantages,such as high energy consumption and poor effect.Therefore,it is urgent to explore some materials with excellent performance to solve the current problems.As an advanced and attractive material,separation membrane has become the ideal material that people like.Compared with traditional separation technologies such as extraction and distillation,membrane separation has the advantages of lower energy consumption,simple operation,excellent separation performance,and zero emission.Therefore,gas separation membranes are expected to be widely used in the above-mentioned gas purification and capture fields.In recent years,the problem of Volatile Organic Compounds（VOC）pollution has been extremely serious.Studies have shown that VOC can harm human organs such as the liver and nervous system,and can cause cancer in severe cases.At the same time,it will also destroy the ozone layer in the atmosphere.Therefore,the effective recovery and utilization of volatile oil and gas has attracted widespread attention.So far,many technical processes related to deal with volatile organic compounds have been reported,such as absorption method,plasma catalytic oxidation,adsorption method,condensation method,etc.Among them,adsorption separation technology is regarded as one of the most effective methods as a mature and most cost-effective method.Therefore,the exploration of high-efficiency adsorbents has become a subject of continuous exploration.Metal Organic Frameworks（MOFs）,as an ordered inorganic-organic hybrid porous crystalline material,have become one of the popular materials in the field of gas adsorption and separation in recent years.This topic selects MOFs materials as the research object,and explores the performance of gas membrane separation and alkane adsorption of such materials.We synthesized[Cu₂（tpa）₂（bipy）]_n powder material and successfully prepared[Cu₂（tpa）₂（bipy）]_n membrane by the secondary growth method,and it has good separation performance for mixed gas,and we have proved this through experiments that the membrane material has good long-term stability and repeatability.In the high temperature test,the permeability of H₂ and the separation factor of H₂/CO₂ will increase with the increase of temperature.It also illustrates the stability and excellent separation performance of the membrane material at high temperatures.For the adsorption of ethane in volatile organic compounds,we selected several MOF powder materials,first tested their crystallinity,stability,specific surface area,etc.,and then used commercial activated carbon as a control.The adsorption performance was compared.In view of the instability of the MOF material,we modified the MOF material again,and then tested the adsorption capacity of ethane again.The results show that the modified sample still has high adsorption performance and has potential application value.