CO2 capture in activated pyrolytic coke/metal oxide nanoparticle composites

Carbon dioxide (CO2) capture from flue gas is of utmost importance in mitigating greenhouse gas emissions. This study focuses on enhancing the CO2 adsorption capacity of activated carbon (AC) composites through the incorporation of metal oxides. AC, AC/Fe3O4, and AC/MgO composites were synthesized and characterized using various analytical techniques including Raman and FTIR spectroscopy, TGA, SEM, EDX, XRD, AFM, BET, and VSM analysis. The CO2 adsorption isotherms of the AC/MgO and AC/Fe3O4 composites were measured at different temperatures and pressures using quartz crystal microbalance (QCM). The Langmuir model was successfully employed to fit the experimental data, with AC/MgO and AC/Fe3O4 exhibiting adsorption capacities of 38.567 mmol g− 1 and 71.963 mmol g− 1, respectively, at 298.15 K and 5 bar. These results demonstrate the significant enhancement of CO2 adsorption capacity achieved by incorporating metal oxides into the AC composite structure. Furthermore, the regeneration efficiency of the adsorbents was evaluated through multiple adsorption/desorption cycles, revealing that AC, AC/MgO, and AC/Fe3O4 maintained adsorption capacities of 94.1%, 97.9%, and 96.5%, respectively, after six consecutive cycles. This confirms their stability and reusability under practical conditions. These findings contribute to our understanding of CO2 capture using activated pyrolytic coke and metal oxide nanoparticle composites, highlighting the promising potential of AC/MgO composites as effective adsorbents for CO2 capture applications. Further investigation and optimization of composite structures and synthesis methods are warranted to enhance their overall performance and applicability [Display omitted]