Simulation of Lead Ions Adsorption onto the Iron-Coated Medium: Dependent on Temperature and pH
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 10, Issue 1
Abstract
Heat was employed to coat crystalline goethite onto a quartz sand surface so that the adsorbent properties of the coating could be utilized. Adsorption experiments were conducted to further demonstrate the adsorption of lead ions by goethite-coated medium under various temperatures and pH, respectively. The adsorption reaction between iron-coated medium and lead ions was simulated by a cation exchange model. Results indicated that the solution temperature and pH had a noticeable effect on the final adsorption capacity for lead ions. The pH-adsorption edges were shifted to lower pH values with increasing temperature. The adsorption reaction between lead ions and goethite-coated medium was an endothermic process. A cation exchange model applied to the regression model of experimental data was fitted very well. A high correlation coefficient and an extreme low -value indicated that the variance of dependent variable, adsorption capacity of iron-coated medium could be firmly explained by independent variables such as , temperature and .
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Acknowledgments
The writers express their gratitude to the National Science Council of the Republic of China (Contract Nos. UNSPECIFIEDNSC 93-2211-E-242-009 and UNSPECIFIEDNSC 94-2211-E-242-007) for its financial support.
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 10 • Issue 1 • January 2006
Pages: 28 - 32
Copyright
© 2006 ASCE.
History
Received: Jul 25, 2005
Accepted: Jul 25, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
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