Effect of heat treatment on CO2 adsorption of KOH-activated graphite nanofibers.
In this work, graphite nanofibers (GNFs) were successfully expanded intercalating KOH followed by heat treatment in the temperature range of 700-1000 °C. The aim was to improve the CO(2) adsorption capacity of the GNFs by increasing the porosity of GNFs. The effects of heat treatment on the pore structures of GNFs were investigated by N(2) full isotherms, XRD, SEM, and TEM. The CO(2) adsorption capacity was measured by CO(2) isothermal adsorption at 25 °C and 1 atm. From the results, it was found that the activation temperature had a major influence on CO(2) adsorption capacity and textural properties of GNFs. The specific surface area, total pore volume, and mesopore volume of the GNFs increased after heat treatment. The CO(2) adsorption isotherms showed that G-900 exhibited the best CO(2) adsorption capacity with 59.2 mg/g.
Meng
Long-Yue
LY
Department of Chemistry, Inha University, 253 Nam-gu, Incheon 402-751, South Korea.
Park
Soo-Jin
SJ
D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry*; D010316:Particle Size; D017680:Potassium Compounds / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
D006878:Hydroxides; D017680:Potassium Compounds; D002245:Carbon Dioxide; D006108:Graphite; C029943:potassium hydroxide