Experimental study of CO<sub>2</sub> adsorption using activated carbon
Maha M. Almoneef, Hedi Jedli, Mohamed Mbarek
Abstract
Abstract The current study aimed to investigate the CO 2 adsorption isotherms of activated carbon (AC), prepared from olive waste via chemical activation by H 3 PO 4 . The textural parameters, the microstructural and morphological characterization of the AC were characterized by N2 adsorption-desorption, SEM and XRD. The AC presented the best textural properties with a BET surface area of 1565 m 2 g −1 and a micropore volume of 0.649 cm 3 g −1 . The CO 2 adsorption was measured with a volumetric method at three various temperatures: 298 K, 308 K and 318 K. Different models, such as the Langmuir and Freundlich isotherms, were applied to model the CO 2 adsorption. Based on the correlation coefficient (R 2 ), the Langmuir model provided a the best fit with the experimental data. Different thermodynamic functions, such as Gibbs free energy and entropy, were calculated using Van Hoff’s formulation. These thermodynamic parameters indicated that the CO 2 adsorption is an exothermic and spontaneous process. The results obtained in this study can serve as a benchmark while designing an adsorption-based gas storage system. the Freundlich