Abstract
Commercially available activated carbon fibers (ACFs) were modified further by a chemical activation method to obtain superior CO 2 adsorption capacity. The relationship between the pore structure of the modified ACF and the CO 2 adsorption behaviors was investigated. Chemical activation (with KOH at a fixed activation temperature of 900°C for 1h and various KOH/ACF weight ratios ranging from 1 to 4) of ACF increased the total pore volume and specific surface area to 1.124cm 3g -1 (KOH/ACF weight ratio of 2) and 2318m 2g -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 CO 2 adsorption capacity of 250mgg -1 at 298K and 1bar was observed at a KOH/ACF weight ratio of 3. The modified ACF had the narrowest microporosity ranging from 0.5 to 0.7nm. Therefore, the increase in CO 2 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.
| Original language | English |
|---|---|
| Pages (from-to) | 230-235 |
| Number of pages | 6 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 389 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Jan 2013 |
Bibliographical note
Funding Information:This work was supported by the Korea CCS R&D Center (KCRC) grant funded by the Korea government (Ministry of Education, Science and Technology) (0031985).
Keywords
- Activated carbon fibers
- CO adsorption capacity
- Well-uniformed pore size