Cobalt and zinc removal from aqueous solution by chemically treated bentonite

Reyad A. Shawabkeh (), Omar A. Al-Khashman, Hamzeh S. Al-Omari and Ali F. Shawabkeh
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Reyad A. Shawabkeh: Mutah University
Omar A. Al-Khashman: Al-Hussein Bin Talal University
Hamzeh S. Al-Omari: Mutah University
Ali F. Shawabkeh: Al-Balqa Applied University

Environment Systems and Decisions, 2007, vol. 27, issue 3, 357-363

Abstract: Abstract Natural bentonite was treated by hydrochloric, nitric, and phosphoric acids followed by washing with sodium hydroxide in order to enhance its adsorption capacity. The sample that treated with hydrochloric acid followed by further treatment with NaOH showed the highest cation exchange capacity with a value of 51.20 meq/100 g. The zero-point of charge for this sample was found to be 4.50. Adsorption isotherms for both cobalt and zinc were fitted using Langmuir, Freundlich, and Redlich-Peterson and showed an adsorption capacity of 138.1 mg Co2+ and 202.6 mg Zn2+ per gram of treated sample.

Keywords: Cobalt; Zinc; Heavy metals; Pollution; Adsorption; Bentonite; Treatment (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1007/s10669-007-9048-1

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