Sorption of organic compounds to activated carbons. Evaluation of isotherm models

Pikaar, Ilje, Koelmans, Albert A. and van Noort, Paul C.M. (2006) Sorption of organic compounds to activated carbons. Evaluation of isotherm models. Chemosphere, 65 11: 2343-2351. doi:10.1016/j.chemosphere.2006.05.005

Author Pikaar, Ilje
Koelmans, Albert A.
van Noort, Paul C.M.
Title Sorption of organic compounds to activated carbons. Evaluation of isotherm models
Journal name Chemosphere   Check publisher's open access policy
ISSN 0045-6535
Publication date 2006-12
Sub-type Article (original research)
DOI 10.1016/j.chemosphere.2006.05.005
Volume 65
Issue 11
Start page 2343
End page 2351
Total pages 9
Place of publication United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
Sorption to 'hard carbon' (black carbon, coal, kerogen) in soils and sediments is of major importance for risk assessment of organic pollutants. We argue that activated carbon (AC) may be considered a model sorbent for hard carbon. Here, we evaluate six sorption models on a literature dataset for sorption of 12 compounds onto 12 ACs and one charcoal, at different temperatures (79 isotherms in total). A statistical analysis, accounting for differences in the number of fitting parameters, demonstrates that the dual Langmuir equation is in general superior and/or preferable to the single and triple Langmuir equation, the Freundlich equation, a Polanyi-Dubinin-Manes equation, and the Toth equation. Consequently, the analysis suggests the presence of two types of adsorption sites: a high-energy (HE) type of site and a low-energy (LE) type of site. Maximum adsorption capacities for the HE domain decreased with temperature while those for the LE domain increased. Average Gibbs free energies for adsorption from the hypothetical pure liquid state at 298 K were fairly constant at -15 ± 4 and -5 ± 4 kJ mol-1 for the HE and LE domain, respectively.
Keyword Black carbon
Freundlich model
Gibbs free energy
Langmuir model
Polanyi-Dubinin-Manes model
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Thu, 17 Nov 2011, 12:24:59 EST by Mr Ilje Pikaar on behalf of School of Chemical Engineering