Fossil fuel burning is the exclusive of key causes for greenhouse fume Carbon dioxide (CO2). Magnesium nanocomposites synthesized in combination with graphene were characterized and their performance in adsorbing CO2 is validated. The novelty of this work is the use of magnesium oxide decked MG to capture CO2. The magnesium nanocomposites decked with multilayer graphene (MG) were prepared using a simple combustion process. BET surface area of 1480 m2g-1 makes it desirable for adsorbing CO2 molecules. FTIR analysis after adsorption of CO2 shows peak mid position at 3470.45 cm-1, 1300-1000 cm-1, 1603 cm-1, and 1114.30 cm-1 corresponding to the functional groups R-C-O, R-OH, R-COOH, -alkyne, Si-O-Si, and R-C-O-H shifted, signifying that chemisorption has taken place. The effect of many experimental parameters like adsorbent mass, period, and concentration of CO2 was optimized during the experiments. A maximum of 92.2% of CO2 was adsorbed at a concentration of 5 × 10- 4 M at the optimum contact of 70 min. During the experiment, the saturation point was attained at 70 min. Experiment results were best fitting to Langmuir adsorption isotherm; the maximum monolayer adsorption capacity of MG was 7.067 × 10-3 mol/g/min. The kinetics of CO2 on MG was labeled by Pseudo-second-order and R2 value nearly 0.988.
Keywords: Adsorbent; Carbon dioxide adsorption; Graphene-based materials; Isotherms; MgO.
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