Abstract
In this study, adsorption of CO2 was performed experimentally using NaOH@Chitosan-Fe3O4 as a magnetic biodegradable adsorbent. Chitosan was magnetized with Fe3O4 nanoparticles. In order to improve alkali nature of Chitosan-Fe3O4, NaOH solution with concentration 4 M immobilized on it. According to the results with increasing pressure from 1 to 9 bar and decreasing temperature from 25 to 65 °C, the adsorption capacity was enhanced. The highest adsorption capacity was 3.21 mmol/g at 25 °C and 9 bar. The isotherm study results indicated that the well-fitting correlation between experimental data with the Langmuir, Freundlich and Sips models based highest R2 values. The Elovich kinetic model can be best fitted with adsorption results. The kinetic study showed that the connection of CO2 to the adsorbent performed by forming the chemical bonds and it was heterogeneous adsorption mechanism. The thermodynamic results displayed that the adsorption process was exothermic and spontaneous. The diffusion coefficient, mass flux, and mass transfer coefficient for CO2 molecules in the single-component system have calculated 2.850 m2/s, 0.0042 mol/m2.s, and 10.324 m/s, respectively.
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