CO₂ adsorption equilibria on a hybrid palm shell-PEEK porous carbons

CO₂ emission is attributed to be the major contributing factor for global warming. In this work, hybrid porous carbons were prepared by K₂CO₃ microwave assisted activation of palm shell with polyetheretherketone (PEEK). The Porous carbons (M4P2 and M5P2) were investigated as potential sorbents for CO₂ capture at various temperatures. The ideal CO₂ adsorption capacities of porous carbons were determined using volumetric method at temperatures of 303.15 and 243.15, 378.15 and 443.15 K and pressures (1-4 bar). CO₂ uptake of 2.97 and 2.55 mmol CO₂ adsorbed/g adsorbent was achieved by M4P2 and M5P2 sorbents at 30 °C and 1 bar. The experimental data of the CO₂ adsorption on the porous carbons were correlated by the Freundlich, Langmuir, Toths and Sips isotherm models. Sips adsorption isotherm model fits the data better with higher correlation coefficient and low root mean square deviation (RSMD) at all temperatures. CO₂ adsorption was faster initially and then subsequently decreased with time. The findings revealed the potential of palm shell-PEEK as sorbents for CO₂ adsorption applications.