Abstract
The ion-exchange sorption of La(III) and Ce(III) from nitrate solutions using oxidized carbon nanotubes with a solubility of 4.2 g/L is studied at metal concentration С = 5–160 mg/L, рН 2.5–6.0, ratio S: L = 0.002–0.06, and room temperature. At С = 35 mg/L, the equilibrium capacity is shown to grow dramatically with рН rising from 3.0 to 4.0–4.5 and reaching 840 mg/g in La and 950 mg/g in Се when S: L < 0.006 and рН > 4.0–4.5. The introduction of ionic salts is found to reduce the capacity (at рН > 4 and concentrations of 0.01 М and 0.1 М NaCl, the Се capacity is reduced to ~500 and ~200 mg/g). It is concluded that the sorption equilibrium is better described by the Langmuir equation, while the process kinetics, by pseudo-first and pseudo-second order equations.
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Original Russian Text © Sh.T. Lyu, E.G. Rakov, 2016, published in Zhurnal Fizicheskoi Khimii, 2016, Vol. 90, No. 10, pp. 1523–1527.
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Lyu, S.T., Rakov, E.G. Sorption of La(III) and Ce(III) by oxidized carbon nanotubes. Russ. J. Phys. Chem. 90, 2011–2015 (2016). https://doi.org/10.1134/S0036024416100198
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DOI: https://doi.org/10.1134/S0036024416100198