Preparation And Properties Of Crystalline Porous Organic Salts

In the current process of industrial technology development,the main way of water adsorption is through porous materials for adsorption.However,the porous materials currently used for water adsorption have irregular pore channels,which are prone to blockage in the process of water adsorption,or collapse of the skeleton after water adsorption,which can not be recycled,which greatly reduces the economic benefits of the materials.In view of this,this paper aims at the problems existing in the process of water adsorption of porous materials,two new crystalline porous organic salts were synthesized and their application in water absorption was explored.As a new member of the family of porous materials,the framework of crystalline porous organic salts is determined by ionic bond interaction,as well as the auxiliary action of hydrogen bonds.Due to its mild synthetic conditions,regular pore channels and permanent pore structure,it has attracted much attention in various fields and gradually entered the current application market.In this paper,by describing the basic concept of crystalline porous organic salt,the synthesis method of crystalline porous organic salt is fully demonstrated,and its application fields are briefly introduced.Secondly,two new crystalline porous organic salts were synthesized by using an organic acid of 4,4'-biphenyl disulfonic acid and two organic bases:tetra-aminophenyl methane and 1,3,5-cyclohexanetriamine.CPOS-12 and CPOS-13synthesized at room temperature have good thermal stability,and their micropore surface areas are 39 m²·g^-1,8 m²·g^-1,respectively.The adsorption capacity of water can reach 0.13g·g^-1,0.04 g·g^-1.According to thermogravimetric analysis,CPOS-12 exhibits obvious weightlessness before 120?,which may be attributed to the loss of water adsorbed in the form of hydrogen bonds in the pore.The CPOS-13 has obvious mass loss before 140?,porous organic salts adsorbed by water are completely removed at the temperature.In the cycle experiment,the water adsorption capacity of CPOS-12 and CPOS-13 can still reach about 0.1 g·g^-1 and 0.04 g·g^-1after three cycles.Finally,the two new kinds of crystalline porous organic salts maintain their original crystallinity after cyclic adsorption,and the infrared spectra before and after cyclic adsorption also prove that the functional groups and structures in the crystal structure remain unchanged.This indicates that CPOS-12 and CPOS-13 have a good application prospect in the field of water adsorption.