Synthesis and CO2 uptake performance of novel methyl functionalized covalent organic frameworks
In order to improve the crystallinity of covalent organic frameworks(COFs)materials and improve their application in the field of gas adsorption,2,5 dimethyl terephthalic hydrazide(Th-(Me)2)and 2,4,6-tri(4-aldehyde phenylphenyl)-1,3,5-triazine(TFPT)were used as building blocks,leading to the successful synthesis of novel methyl functionalized COF(COF-Th-Me)through the solvothermal method.Powder X-ray diffraction,fourier transform infrared spectroscopy,solid-state carbon nuclear magnetic resonance spectroscopy and nitrogen adsorption-desorption methods were employed to study its structural properties.The results show that compared with non-methyl functionalized COF(COF-Th),the crystallinity of COF-Th-Me is significantly improved,and the structure in AA stacked mode(Rwp=2.00％,Rp=1.53％)according to simulation results.The thermogravimetric analysis show that COF-Th-Me has high thermal stability.Under the conditions of 273 K and 0.1 MPa,COF-Th-Me exhibits an adsorption capacity of 27.6 cm3/g for CO2,demonstrating its potential application in the field of gas adsorption.
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