Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 30, Issue 2, Pages 448-455Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-012-0126-9
Keywords
Multiwalled Carbon Nanotubes (MWCNTs); Cerium; Samarium; Adsorption; Desorption; Isotherm; Kinetics
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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, and contact 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 (q (m) ) 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 (Delta G(o), Delta H-o, and Delta S-o) showed that the adsorption for Ce(III) and Sm(III) is feasible, spontaneous and exothermic at 30-60 A degrees C. Moreover, more than 70% of Ce(III) and Sm(III) adsorbed onto Oxidized MWCNTs could be desorbed with HNO3.
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