Original scientific paper
Published in: Holistic Approach Environ. 1(2011) 1, pp. 12 – 17
Paper reference number: HAE-2
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APPLICATION OF DIFFERENT ISOTHERM MODELS ON LEAD IONS SORPTION ONTO ELECTRIC FURNACE SLAG

Lidija Ćurković^*, Alenka Rastovčan-Mioč†^**, Marijana Majić^*, Josip Župan^*

^* Faculty of Mechanical Engineering and Naval Technology, University of Zagreb, Croatia

^** Faculty of Metallurgy, University of Zagreb, Croatia

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ABSTRACT

The effect of temperature on the equilibrium sorption of Pb²⁺ from aqueous solution onto a low-cost electric furnace slag was investigated. In this paper, two-parameter isotherm models namely the Langmuir and the Freundlich and three-parameter isotherm model namely Redlich–Peterson were applied to describe the isotherms and to calculate their constants. The best estimation of the parameters of these models by a non -linear regression analysis was obtained. A comparison between two-parameter and three-parameter isotherms was reported. The characteristic parameters for each isotherms and related coefficient of determination (R²) have been determined using MATLAB 6.5. All the coefficients of determination (R²) of the non-linear method are close to unity. The Redlich−Peterson isotherm produced a higher coefficient of determination values in comparison to all the isotherms studied.

Keywords: lead, electric furnace slag, sorption isotherm
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