Novel Nitrogen and Sulfur Rich Hyper-Cross-Linked Microporous Poly-Triazine-Thiophene Copolymer for Superior CO2 Capture

Abstract

A novel synthetic strategy has been developed for the preparation of hyper-cross-linked microporous copolymers, HMC-1, HMC-2, and HMC-3, by using 2,4,6-tri(thiophen-2-yl)-1,3,5-triazine and thiophene monomers in their different molar ratios in the presence of anhydrous FeCl3 in chloroform under solvothermal conditions at 150 °C. These polymers are highly porous and robust materials, exhibiting very high BET surface areas and supermicroporosity. The presence of triazine and thiophene moieties within the copolymer network increases the electron donating basic N and S sites in the porous frameworks. Thus, these porous polymers displayed efficient adsorption of Lewis acidic CO2 molecules and showed good CO2/N2 adsorption selectivity. The maximum CO2 uptake of 14.2 mmol g–1 at 273 K under 3 bar pressure has been observed.