Burcu Selen ÇAĞLAYAN, Ahmet Erhan AKSOYLU

CO2adsorption behavior and kinetics on chemically modi ed activated carbons

CO2adsorption capacities of activated carbon-based adsorbents subjected to different treatments, such asHNO3oxidation, air oxidation, alkali impregnation, and heat treatment under helium gas atmosphere, were determinedby gravimetric analyses and reported previously by our group. In the current work, the experimental adsorption isothermsof these modi ed activated carbon samples were tted to Langmuir, Freundlich, and Dubinin{Radushkevich (D-R)models. The best ts were obtained to the D-R equation, indicating competitive or multilayer CO2adsorption occurringin the micropores of the adsorbents. Air oxidation followed by alkali impregnation led to the highest micropore volume,ranging between 0.259 and 0.298 g.CO2/g.adsorbent, which resulted in the highest CO2adsorption capacity of 8.87%at 1 atm and 25◦C. The CO2adsorption kinetic plots revealed a two-step adsorption process for all the adsorbents: arelatively fast kinetic region phase followed by a slow one until reaching the equilibrium. Pseudo- rst and pseudo-secondorder kinetics explain adsorption for the kinetic region for most of the samples. When the whole adsorption data rangeis considered, the adsorption cannot be explained by any model at 25◦C due to the complex nature of the adsorbents,but the adsorption behavior ts rather well to pseudo- rst order kinetics at 120◦C for the alkali-impregnated samples.

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