Removal of ruthenium from aqueous solution by clinoptilolite
Kabiri-Tadi, Mahboobeh (University of Isfahan. Department of Chemistry)
Faghihian, Hossein (Islamic Azad University. Department of Chemistry)

Data:	2011
Resum:	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 ΔG decreased with increasing temperature, indicating that adsorption is favored at higher temperatures. The positive values of ΔH corresponded to the endothermic nature of the adsorption processes. The proposed method of removal is applicable at an industrial scale.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Adsorption ; Aqueous Solution ; Clinoptilolite ; Removal ; Ruthenium
Publicat a:	Clays and Clay Minerals, Vol. 59, Núm. 1 (2011) , p. 34-41, ISSN 1552-8367

DOI: 10.1346/CCMN.2011.0590106

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