Design,Synthesis And Adsorption Properties Of Nanoporous Materials

Nanoporous materials are porous polymer materials composed of organic small molecules,inorganic small molecules,or organic-inorganic molecules connected by chemical bonds.According to the degree of regularity in the microscopic perspective,it can be divided into two categories:amorphous and high crystallinity materials.Due to its adjustable pore size,the diversity of pore-forming framework structures,and the modifiability of chemical functional groups around pore walls,nanoporous materials provide a broad research platform for many fields such as energy and environmental governance.In this paper,six kinds of amorphous organic polymers were synthesized using different organic small molecules,and a high crystallinity COFs were modified.Their adsorption properties for radioactive waste,organic dyes and carbon dioxide were also studied.In addition,a green synthesis method of MOF-505 was also studied.We alkylated aniline,9,9-bis(4-aminophenyl)fluorene,triphenylamine,N,N,N',N'-tetraphenylbenzidine,and sodium tetraphenylborate,respectively,to synthesize Five nitrogen-rich polymers and a mesoporous polymer with an anionic backbone were identified.The two AHCPs with primary amine groups synthesized by aniline exhibited ultra-high adsorption capacity of 250 wt%and 596 wt%for iodine in aqueous solution and vapor,respectively.Under the same conditions,the polymer based on sodium tetraphenylborate can increase the adsorption rate of rhodamine B by more than 40%.In addition,we used sodium borohydride to reduce the imine bond in 4PE-1P COF to amine bond at low temperature to obtain 4PE-1P COF-AR,which increased the CO₂ adsorption capacity by 64.31%;the iodine vapor capacity increased by 21.56%;adsorption capacity of methyl iodide increased by 48.09%.Finally,we used copper oxide and 3,3?,5,5?-biphenyltetracarboxylic acid as raw materials,first pre-ion liquid-grinding with ethanol for 1 min for pretreatment and mixing,and then placed in water vapor for fumigation at room temperature for 20 h to obtain VAG-MOF-505 with high crystallinity.SEM and PXRD results showed that VAG-MOF-505 had similar crystallinity to the product synthesized by solvothermal method.