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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 18, 2013
Accepted September 15, 2013

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Adsorption of heavy metal ions in ternary systems onto Fe(OH)3

Syed Mustafa Muhammad Irshad Muhammad Waseem^1† Khizar Hussain Shah Umer Rashid² Wajid Rehman²

National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan ¹Department of Physics, Comsats Institute of Information Technology, P. O. Box 44000, Islamabad Pakistan ²Department of Chemistry, Hazara University, Mansehra 21300, Pakistan

Korean Journal of Chemical Engineering, December 2013, 30(12), 2235-2240(6), 10.1007/s11814-013-0178-5

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Abstract

The adsorption behavior of amorphous Fe(OH)3 has been studied in multicomponent metal system. The metal ions uptake in the ternary system is lower than in the single system, suggesting that certain sites on the surface of the solid are blocked due to competition. The selectivity trend in the ternary system is observed to be Ni2+>Zn2+>Cd2+ which is, however, lost with increase in the temperature of the aqueous solution. Further, the observed selectivity trend is neither related to electronegativity of the metal ions nor to the pH of the hydrolysis, but has been found dependent on charge to radius ratio. The metal ions adsorption is found to increase with pH, while the converse is true with the rise in temperature. The uptake of metal ions data has been interpreted in terms of stoichiometry, binding constants and adsorption capacities. The negative values of ΔG show that uptake of metal ions is favored at lower temperatures, indicating that the adsorption mechanism essentially remains ion exchange in nature.

Keywords

Ternary System Metal Adsorption Modeling Thermodynamic Parameters

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