Preparation and CO Sorption of a High Surface Area Activated Carbon Obtained from the KOH Activation of Finger Citron Residue

• Main Authors: Wei Dai, Yuchen Liu, Wei Su, Gengshen Hu, Gang Deng, Xin Hu
• Format: Article
• Language: English
• Published: Hindawi - SAGE Publishing 2012-02-01
• Series: Adsorption Science & Technology
• Online Access: https://doi.org/10.1260/0263-6174.30.2.183

A high surface area activated carbon was synthesized by potassium hydroxide (KOH) activation of Finger Citron residue. The pore structure of the as-synthesized activated carbon was characterized by nitrogen adsorption and its carbon dioxide (CO 2 ) sorption capacities at different conditions were measured under high pressure. The BET surface area and total pore volume of the as-synthesized sample were 2887 m 2 /g and 1.23 cm 3 /g, respectively. The dry sample exhibited a CO 2 adsorption capacity of 19.21 mmol/g at 276 K and 3.57 MPa. The CO 2 adsorption uptake increased considerably when an amount of water was pre-adsorbed onto the sample, possibly as a result of the formation of CO 2 hydrate in the pore spaces of the activated carbon. The maximum CO 2 adsorption capacity of the wet sample was found to be 29.02 mmol/g at 273 K and 3.57 MPa. Overall, the results reported confirm that Finger Citron residue could prove a promising precursor for high surface area activated carbon and point to the potential application of activated carbon made from Finger Citron residue in carbon capture and storage.