capture

water vapor

adsorption performance

functional groups

adsorption desorption

gas adsorption

carbon capture

il zif

separation performance

Environmental progress & sustainable energy

In this study, a hypercrosslinked polymer (HCP) adsorbent based on Friedel–Crafts reaction and carbazole as a monomer was synthesized and used for CO 2 capture. The HCP adsorbent is characterized by Fourier transform infrared spectroscopy, Brunauer, Emmett and Teller analysis, and energy dispersive spectroscopy. The effects of crosslinker to carbazole ratio, synthesis time and catalyst type, and their interactions were evaluated by response surface methodology using central composite design. The result showed that the optimum adsorption capacity (191.2 mg/g) was obtained at a crosslinker to carbazole ratio of 2.7, synthesis time of 11.2 h, and FeCl 3 as catalyst of the reaction. The experimental adsorption data fitted by adsorption isotherm and kinetic models in the optimized parameter values and correlation coefficient ( R 2 ) were considered to select the best model. The results showed that Hill isotherm and Elovich kinetic models have higher R 2 values than other models. Finally, the feasibility of the adsorption process was determined by thermodynamic modeling and enthalpy, entropy, and Gibbs free energy differences of adsorption at 298.15 K and 5 bar were calculated −15.035 kJ/mol, −0.025 kJ/mol.K and −7.822 kJ/mol, respectively.

Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO2 capture