Poly(triazine-co-pyrrole)-based conjugated microporous polymers for carbon dioxide capture

Abstract

Nowadays, conjugated microporous polymers (CMPs) are among the superior porous materials for carbon dioxide (CO2) capture. The objective of this study was to accomplish oxidative copolymerization of 2,4,6-tris(5-bromothiophene-2-yl)-1,3,5-triazine and pyrrole in the presence of iron(iii) chloride to produce a series of conjugated microporous polymers, TP-CMP-1, TP-CMP-2 and TP-CMP-3 for CO2 capture applications. The monomers were employed at different molar ratios; the polymerization proceeded at room temperature, and subsequently, under solvothermal conditions to form a microporous network. The chemical structure of these TP-CMPs was ascertained using FTIR and solid 13C NMR techniques. The TP-CMPs were further characterized for thermal and morphological studies and subsequently evaluated for CO2 adsorption capacity. All the TP-CMPs showed exceptional thermal stability with decomposition temperatures ranging from 314 to 390 °C. Moreover, these TP-CMPs exhibited a Brunauer-Emmett-Teller (BET) surface area of up to 556 m2 g−1, and CO2 adsorption of up to 1.09 mmol g−1 at 298 K under 1 bar pressure. The high surface area facilitated great interactions with CO2 molecules and enhanced carbon dioxide capture.