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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 8, 2016, pp. 1873-1882
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Bioline Code: st16174
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 8, 2016, pp. 1873-1882
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Thallium removal through adsorption onto ionic liquid-impregnated solid support: influence of the impregnation conditions
Negrea, P.; Popa, A.; Lupa, L. & Voda, R.
Abstract
This article presents the use of ionic liquid in
the removal process of thallium ions using solid–liquid
extraction by impregnating ionic liquid (1-n-hexyl-3-
methylimidazolium chloride) onto an inorganic solid support (Florisil). The influence of impregnation was studied
in order to improve the adsorption capacity of the material
obtained. Impregnation was realized with the help of a
rotavapor. Stirring time and temperature used were varied.
Ionic liquid-impregnated materials obtained at different
conditions of impregnation were characterized using
scanning electron microscopy, energy-dispersive X-ray
analysis, and Fourier transform infrared spectroscopy. In
order to determine the most efficient adsorbent material,
the materials obtained were used in the removal process of
thallium ions from aqueous solutions, varying the initial
concentration of thallium ions and the stirring time used in
the adsorption process. It was observed that for the
improving the adsorption capacity of the obtained ionic
liquid-impregnated material, it is not necessary to increase
the stirring time of the impregnation process but to increase
the temperature. The experimental data obtained in the
adsorption process were fitted with the Langmuir isotherm.
Adsorption of thallium ions onto Florisil impregnated with
1-n-hexyl-3-methylimidazolium chloride ionic liquid corresponds to a pseudo-second-order kinetic model.
Keywords
Ionic liquid; Impregnation; Thallium; Adsorption
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