Removal of Nickel(II) from Dilute Aqueous Solution by Sludge-Ash
Publication: Journal of Environmental Engineering
Volume 128, Issue 8
Abstract
This work examines the adsorption of Ni(II) onto sludge–ash, a waste produced from a fluidized bed incinerator combusted primarily with biosolids. Results of kinetic experiments showed that the adsorption was rapid. The kinetic adsorption data can be well described by an empirical modified Freundlich equation. The rate of adsorption decreased with either increasing surface loading and ionic strength or decreasing solution pH. The results of equilibrium studies showed that the solution pH was the key factor affecting the adsorption. The modified Langmuir model fit revealed that the hydrogen ion acts as a competitive inhibitor for the adsorption of Ni onto ash. The maximum adsorption capacity for Ni is 5.41 μmol/g. Experimental results indicate that the adsorption is favorable at higher temperature. Thermodynamic adsorption parameters for and are −7.41 kcal/mol, 7.25 kcal/mol, and 48.9 cal/mol K, respectively.
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Published In
Journal of Environmental Engineering
Volume 128 • Issue 8 • August 2002
Pages: 716 - 722
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Mar 31, 2000
Accepted: Jan 25, 2002
Published online: Jul 15, 2002
Published in print: Aug 2002
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