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Modification of Langmuir isotherm in solution systems - Definition and utilization of concentration dependent factor

Title
Modification of Langmuir isotherm in solution systems - Definition and utilization of concentration dependent factor
Authors
Sohn S.Kim D.
Ewha Authors
김동수
SCOPUS Author ID
김동수scopus
Issue Date
2005
Journal Title
Chemosphere
ISSN
0045-6535JCR Link
Citation
Chemosphere vol. 58, no. 1, pp. 115 - 123
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The Langmuir isotherm, originally derived for the adsorption of gas molecules on solid surfaces, was modified to fit the adsorption isotherm of solutes onto solid surfaces in solution systems. The aim of this modification is based on the fact that direct application of the Langmuir isotherm to solution systems often leads to poor data fitting. In the present communication, it is shown that the level of data fitting to the Langmuir isotherm of literature data can be improved by a simple modification introducing a concentration dependent factor, X. The key concept of the modification lies in that the concentration of solute affects both adsorption and desorption stages. As a first approximation, we adopted a single-term polynomial for both processes of adsorption and desorption. Based on reanalysis of literature data of adsorption in solution, we confirmed that indeed the modified Langmuir isotherm more accurately describes the experimental observations. Furthermore, we proposed that the concentration dependent factor could be associated with the surface heterogeneity index that was introduced in a few other modified Langmuir isotherms. Some advantages and limitations of proposed modified Langmuir isotherm are also discussed. © 2004 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.chemosphere.2004.08.091
Appears in Collections:
공과대학 > 환경공학과 > Journal papers
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