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In relation to this article, we declare that there is no conflict of interest.
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Received May 16, 2012
Accepted August 2, 2012
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Adsorption ability of oxidized multiwalled carbon nanotubes towards aqueous Ce(III) and Sm(III)

School of Chemical Engineering, University College of Engineering, University of Tehran, P. O. Box 11365-4563, Tehran, Iran 1Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P. O. Box 11365-8486, Tehran, Iran
atalebi@ut.ac.ir
Korean Journal of Chemical Engineering, February 2013, 30(2), 448-455(8), 10.1007/s11814-012-0126-9
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Abstract

The aim of the present work was to investigate the adsorption of Ce(III) and Sm(III) onto multiwalled carbon nanotubes (MWCNTs) oxidized with concentrate nitric acid. The effects of solution pH, adsorbent dosage, andcontact time were studied by batch technique. Langmuir, Freundlich and D-R isotherms were used to describe the adsorption behavior of Ce(III) and Sm(III) by oxidized MWCNTs, and the experimental results fitted Freundlich model well. The maximum uptake capacities (qm) calculated by applying the Langmuir equation for samarium and cerium ions were found to be 89.28 and 92.59 (mg/g), respectively. A comparison of the kinetic models and the overall experimental data was best fitted by the pseudo second-order kinetic model. The calculated thermodynamic parameters (ΔG°, ΔH°, and ΔS°) showed that the adsorption for Ce(III) and Sm(III) is feasible, spontaneous and exothermic at 30-60 ℃. Moreover, more than 70% of Ce(III) and Sm(III) adsorbed onto Oxidized MWCNTs could be desorbed with_x000D_ HNO3.

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