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Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO 2 capture
Author(s) -
Ramezanipour Penchah Hamid,
Najafi Pegah,
Ghaemi Ahad,
Ghanadzadeh Gilani Hossein
Publication year - 2021
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13586
Subject(s) - adsorption , gibbs free energy , enthalpy , carbazole , catalysis , fourier transform infrared spectroscopy , chemistry , monomer , materials science , polymer , thermodynamics , chemical engineering , organic chemistry , physics , engineering
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.