Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 389, Issue -, Pages 230-235Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.09.018
Keywords
CO2 adsorption capacity; Activated carbon fibers; Well-uniformed pore size
Categories
Funding
- Korea CCS RD Center (KCRC)
- Korea government (Ministry of Education, Science and Technology) [0031985]
- National Research Foundation of Korea [2011-0031985] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Commercially available activated carbon fibers (ACFs) were modified further by a chemical activation method to obtain superior CO2 adsorption capacity. The relationship between the pore structure of the modified ACF and the CO2 adsorption behaviors was investigated. Chemical activation (with KOH at a fixed activation temperature of 900 degrees C for 1 h and various KOH/ACF weight ratios ranging from 1 to 4) of ACF increased the total pore volume and specific surface area to 1.124 cm(3) g(-1) (KOH/ACF weight ratio of 2) and 2318 m(2) g(-1) (KOH/ACF weight ratio of 4), respectively. Compared to ACF, the total pore volume and specific surface area were improved by factors of 2.5 and 2.3, respectively. Interestingly, the highest CO2 adsorption capacity of 250 mg g(-1) at 298 K and 1 bar was observed at a KOH/ACF weight ratio of 3. The modified ACF had the narrowest microporosity ranging from 0.5 to 0.7 nm. Therefore, the increase in CO2 adsorption capacity after chemical activation is closely related to the narrower pore size distribution rather than the total or micropore volume and specific surface area. (C) 2012 Elsevier Inc. All rights reserved.
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