Journal
CARBON
Volume 43, Issue 11, Pages 2379-2388Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2005.04.020
Keywords
carbon nanotubes; adsorption; organic
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Gravimetric techniques were employed to determine the adsorption capacities of commercially available purified electric arc and HiPco single-walled carbon nanotubes (SWNTs) for organic compounds (toluene, methyl ethyl ketone (MEK), hexane and cyclohexane) at relative Pressures, p/p(0), ranging from 1 x 10(-4) to 0.95 and at isothermal conditions of 25, 37 and 50 degrees C. The isotherms displayed both type I and type II characteristics. Adsorption isotherm modeling showed that SWNTs are heterogeneous adsorbents, and the Freundlich equation best describes the interaction between organic molecules and SWNTs. The heats of adsorption were 1-4 times the heats of vaporization, which is typical for physical adsorption of organic vapors on porous carbons. (C) 2005 Elsevier Ltd. All rights reserved.
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