화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.15, No.3, 410-414, May, 2009
DOI10.1016/j.jiec.2008.11.001  Export Citation
Nitrogen and hydrogen adsorption of activated carbon fibers modified by fluorination
Min-Jung Jung, Ju Wan Kim, Ji Sun Im, Soo-Jin Park1, and Young-Seak Lee†
  • Department of Applied Chemistry and Biological Engineering, BK21-E2M, Chungnam National University, Daejeon 305-764, Republic of Korea
  • 1Department of Chemistry, Inha University, Nam-Gu, Incheon 402-751, Republic of Korea
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In this study, activated carbon fibers (ACFs) were surface modified with fluorine and mixed oxygen and fluorine gas to investigate the relationship between changes in surface properties by nitrogen and hydrogen adsorption capacity. The changes in surface properties of modified activated carbon fibers were investigated using X-ray photoelectron spectroscopy (XPS) and compared before and after surface treatment. The specific surface area and pore structures were characterized by the nitrogen adsorption isotherm at liquid nitrogen temperature. Hydrogen adsorption isotherms were obtained at 77 K and 1 bar by a volumetric method. The hydrogen adsorption capacity of fluorinated activated carbon fibers was the smallest of all samples. However, the bulk density in this sample was largest. This result could be explained by virial coefficients. The interaction of hydrogen-surface carbon increased with fluorination as the first virial coefficient. Also, the best fit adsorption model was found to explain the adsorption mechanism using a nonlinear curve fit. According to the goodness-of-fit, the Langmuir.Freundlich isotherm model was in good agreement with experimental data from this study.
Keywords:Fluorination;Surface modification;Activated carbon fibers;Adsorption
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