CO2 capture in activated pyrolytic coke/metal oxide nanoparticle composites

Abstract

Carbon dioxide (CO 2 ) capture from flue gas is of utmost importance in mitigating greenhouse gas emissions. This study focuses on enhancing the CO 2 adsorption capacity of activated carbon (AC) composites through the incorporation of metal oxides . AC, AC/Fe 3 O 4 , 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/Fe 3 O 4 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/Fe 3 O 4 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 CO 2 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/Fe 3 O 4 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 CO 2 capture using activated pyrolytic coke and metal oxide nanoparticle composites, highlighting the promising potential of AC/MgO composites as effective adsorbents for CO 2 capture applications. Further investigation and optimization of composite structures and synthesis methods are warranted to enhance their overall performance and applicability

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