Auta M., Umaru M., Yahya M.D., Adeniyi O.D., Aris I. M., and Suleiman B. (2015), Diethanolamine functionalized waste tea activated carbon for CO2 adsorption, Proceedings of International Conf. on Chemical, Environmental and Biological Sciences (CEBS), Dubai, UAE, pp. 119-122, ISBN 978-93-84422-11-0, (March 18-19th 2015) www.iicbe.org

Abstract

Development of carbon (VI) oxide (CO2) adsorbent was attempted by modifying mesoporous waste tea activated carbon (WTAC) with diethanolamine through impregnation. The modified and unmodified WTAC were used for selective adsorption of CO2 from gaseous mixture (CO2 and N2). Effect of certain adsorption parameters such as concentration of the functionalizing agent (diethanolamine), column adsorption temperature, adsorbent dosage (bed height), concentration of the CO2 in the feed and influent gas flow rate on breakthrough curves were evaluated. The exothermic nature of CO2 capturing by MWTAC was physisorptive due to the increase in in adsorption at lower temperature and the extra amine groups present. The optimum condition for CO2 capturing by MWTAC were at adsorption column temperature of 30 oC, 10 % CO2 feed concentration, 1.0 M of diethanolamine used for modification and influent feed flow rate of 90 mL/min. The result of this investigation shows that MWTAC is an excellent CO2-phylic