Adsorption of Cadmium from Aqueous Solutions onto Coffee Grounds and Wheat Straw: Equilibrium and Kinetic Study
Publication: Journal of Environmental Engineering
Volume 142, Issue 9
Abstract
The adsorption kinetics of cadmium (Cd) from wastewater onto coffee grounds and wheat straw was ascertained under various process conditions. Batch tests were performed to study the effect of pH, adsorbent concentration, contact time, and initial metal concentration on the removal of Cadmium. The adsorption kinetics was envisaged by fitting the experimental data to the pseudo-first-order and pseudo-second-order kinetic models; and based on linear regression analysis, the best fit was found to be for the pseudo-second-order kinetic model for both adsorbents. Equilibrium conditions were achieved in less than 30 min. Two isotherm equations, namely Langmuir and Freundlich models, were also used to fit the experimental adsorption equilibrium data. The results showed that both physisorption and chemisorption mechanisms controlled the adsorption rate and capacity. The maximum adsorption capacity of coffee grounds and wheat straw was calculated to be 16.2 and , respectively.
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Acknowledgments
The authors thank Britt Vandenbroeck, Department of Materials Engineering at KU Leuven, for assistance with the ICP-OES setup.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 9 • September 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 22, 2015
Accepted: Jun 29, 2015
Published online: Aug 13, 2015
Discussion open until: Jan 13, 2016
Published in print: Sep 1, 2016
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