Influence of Solution pH and Ionic Strength on Chromate Uptake by Surfactant-Modified Zeolite
Publication: Journal of Environmental Engineering
Volume 130, Issue 2
Abstract
In this study, the influence of solution pH and ionic strength on sorption of chromate by surfactant-modified zeolite was tested. The sorption of chromate followed a Langmuir isotherm under different pH and ionic strength conditions. However, as the solution pH and ionic strength increased, the Langmuir sorption coefficient of chromate decreased systematically, reflecting an increased competition of background electrolyte anions against chromate for sorption sites. The chromate sorption maximum also decreased slightly as the solution pH and ionic strength increased. The stoichiometric relationship between chromate sorption and counterion desorption further indicated that chromate sorption on surfactant-modified zeolite surfaces was mainly due to surface anion exchange. In addition, increases in background electrolyte reduced counterion desorption and resulted in a better surfactant bilayer formation.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 130 • Issue 2 • February 2004
Pages: 205 - 208
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jul 10, 2002
Accepted: Mar 19, 2003
Published online: Jan 16, 2004
Published in print: Feb 2004
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