Analysis of adsorption of gases and vapors on nonporous graphitized thermal carbon black

Do, D. D., Do, H. D. and Tran, K. N. (2003) Analysis of adsorption of gases and vapors on nonporous graphitized thermal carbon black. Langmuir, 19 14: 5656-5668. doi:10.1021/la020191e


Author Do, D. D.
Do, H. D.
Tran, K. N.
Title Analysis of adsorption of gases and vapors on nonporous graphitized thermal carbon black
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1021/la020191e
Volume 19
Issue 14
Start page 5656
End page 5668
Total pages 13
Place of publication Washington, DC, USA
Publisher Amer Chemical Soc
Language eng
Subject C1
290603 Membrane and Separation Technologies
770501 Air quality
Abstract In this paper we analyzed the adsorption of a large number of gases and vapors on graphitized thermal carbon black. The Henry constant was used to determine the adsorbate-adsorbent interaction energy, which is found to be a modest decreasing function of temperature. Analysis of the complete adsorption isotherm over a wider range of pressure yields information on the monolayer coverage concentration and the adsorbate-adsorbate interaction energy. Among the various equations tested, the Hill-de Boer equation accounting for BET-postulated multilayer formation describes well the adsorption isotherms of all adsorbates. On average, the adsorbate-adsorbate interaction energy in the adsorbed phase is less than that in the bulk phase, suggesting that the distance between adsorbed molecules in the first layer of the adsorbed phase is slightly less than the equilibrium distance between two adsorbate molecules in the bulk phase. This suggests that the first layer is in a compressed state, which is due to the attraction of the adsorbent surface. The monolayer concentration as determined from the fitting of the Hill-de Boer equation with experimental data is slightly larger than the values calculated from the molecular projection area, suggesting that molecules can be oriented such that a larger number of molecules can be accommodated on the carbon black surface. This further supports the shorter distance between adsorbate molecules in the adsorbed phase.
Keyword Chemistry, Physical
Physical Adsorption
Isotherms
Surface
Benzene
Heats
State
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 12:17:20 EST