Abstract
In the present work, commercial coconut shell activated carbon was impregnated with alkaline NaOH to investigate the efficiency of modified activated carbon for CO sub(2) adsorption in a fixed-bed column adsorption system. The modification parameters, such as the NaOH concentration (24-48%) and dwelling time (1-4 h), were also investigated. The results showed that a 32% NaOH concentration with a 3 h dwelling time provided the best CO sub(2) adsorption capacity. Later, the modified activated carbon was characterized by nitrogen adsorption-desorption, scanning electron microscopy and Fourier transform infrared spectroscopy. The effects of the CO sub(2) % in the feed, the adsorption temperature, the feed flow rate and the amount of adsorbent in the column were investigated in the adsorption experiments. The maximum CO sub(2) adsorption capacity in this study was 27.10 mg/g at 35 [degrees]C. This study also suggests that NaOH-modified activated carbon is a state-of-the-art adsorbent for CO sub(2) adsorption.