Preparation and Characterization of Polyamides and Nitrogen‐doped Carbons for Enhanced CO2 Capture

Abstract

Porous organic polymers possessing CO2‐philic moieties have captured attention of the researchers due to efficient adsorption of gas molecules. By the condensation of organic rigid and contorted precursors, amide‐linked organic framework polymers with low skeletal density have been prepared via a cost‐effective protocol. Polyamide chains were synthesized via low temperature condensation of 2,4,6‐triamino‐1,3,5‐triazine with terephthaloyl chloride and isophthaloyl chloride to yield PA‐1 and PA‐2, respectively. The synthesized polymers were further carbonized at 600°C to fabricate nitrogen‐doped carbon materials (PA1‐600 and PA2‐600). The as‐prepared materials were analyzed by Fourier transform infrared (FTIR) spectroscopy, X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FE‐SEM), thermal gravimetric analysis (TGA), CHN elemental analysis, textural analysis, and CO2 adsorption measurements. The maximum CO2 uptake determined is 42.85 mg/g at 273 K and 1 bar. The triazine rings with basic nitrogen atoms and amide bonds in the main chain are responsible for CO2 capture by the polymers.