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Removal of Ruthenium from Aqueous Solution by Clinoptilolite

Published online by Cambridge University Press:  01 January 2024

Mahboobeh Kabiri-Tadi  and
Hossein Faghihian
Mahboobeh Kabiri-Tadi
Affiliation:
Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran
Hossein Faghihian*
Affiliation:
Department of Chemistry, Islamic Azad University, Shahreza Branch, Iran
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Ruthenium compounds are highly toxic and carcinogenic. In the present study, clinoptilolite was used in the removal of Ru species from aqueous solutions. Clinoptilolite is a good choice of sorbents because it is naturally abundant and therefore cheap. After the process where Ru was removed from the aqueous solution, the clinoptilolite was characterized by X-ray diffraction, X-ray fluorescence, thermogravimetric analysis, and Fourier-transform infrared spectroscopy techniques. The influence of pH, contact time, and temperature on the adsorption of Ru was investigated and the optimum conditions were found to be 2 h of contact time and pH = 2. Pseudo first-order, pseudo second-order, Elovich, and intra-particle diffusion models were used to analyze the adsorption-rate data. The pseudo second-order model was found to be the best kinetics model in terms of matching the experimental results obtained. Adsorption isotherms were constructed to assess the maximum adsorption capacity of clinoptilolite. The Langmuir model fitted the data reasonably well in terms of regression coefficients. Adsorption studies were also performed at different temperatures to calculate the thermodynamic parameters. The numerical value of ΔG0 decreased with increasing temperature, indicating that adsorption is favored at higher temperatures. The positive values of ΔH0 corresponded to the endothermic nature of the adsorption processes. The proposed method of removal is applicable at an industrial scale.

Keywords

AdsorptionAqueous SolutionClinoptiloliteRemovalRuthenium
Type
Article
Information
Clays and Clay Minerals , Volume 59 , Issue 1 , February 2011 , pp. 34 - 41
Copyright
Copyright © The Clay Minerals Society 2011

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