Abstract
Activated carbon (AC) prepared from corn cobs was used as an adsorbent for CO2 capture under different temperatures. The characterization by Boehm titration and TGA showed that the total acidic groups of AC were significantly higher than the total basic groups, and the increasing activated temperature resulted in increases in the total basicity and decreases in the total acidity. The CO2 adsorption behavior of AC was predicted by four isotherm models. It was found that the suitable order was Sips > Tóth > Freudlich > Langmuir. The maximum monolayer coverage capacity and isosteric heat of adsorption were in the range of 6.28 - 10.92 mmol g-1 and 26.48 - 21.55 kJ mol-1, respectively. High specific surface area and high amount of carboxylic groups were found to be in favor of CO2 capture.
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