Adsorption–Desorption Rate of Nonpolar Volatile Organic Compounds onto Activated Carbon Exemplified by and
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 7, Issue 3
Abstract
This investigation was to evaluate the performance of a thermodynamic model using nonlinear driving force in conjunction with the Langmuir model exemplified by the adsorption of benzene and carbon tetrachloride onto activated carbon in mono- and binary-adsorbate systems. Results show that model-fitted adsorption and desorption rate constants could well predict the adsorption isotherms and breakthrough curves under various conditions. This numerical model can provide adsorption and desorption rate constants. The kinetic parameters are of the same order of magnitude as reported in several studies. Under high reaction temperatures, both the adsorption and desorption rate constants increased while equilibrium constants decreased. A dimensionless valuable can be used to describe the relationship between adsorbate and adsorbent, and predict the service cycle during the adsorption process. For adsorption in binary mixtures, a high inlet concentration or a low temperature, the weak adsorbate, will have a high breakthrough concentration when the strong adsorbate, began to break through.
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 7 • Issue 3 • July 2003
Pages: 148 - 155
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: May 20, 2002
Accepted: Mar 21, 2003
Published online: Jun 13, 2003
Published in print: Jul 2003
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