Working Paper Article Version 1 This version is not peer-reviewed

On the Adsorption of Cerium(III) Using Multiwalled Carbon Nanotubes

Version 1 : Received: 20 July 2020 / Approved: 21 July 2020 / Online: 21 July 2020 (13:40:39 CEST)

A peer-reviewed article of this Preprint also exists.

Alguacil, F.J.; García-Díaz, I.; Escudero Baquero, E.; Rodríguez Largo, O.; López, F.A. On the Adsorption of Cerium(III) Using Multiwalled Carbon Nanotubes. Metals 2020, 10, 1057. Alguacil, F.J.; García-Díaz, I.; Escudero Baquero, E.; Rodríguez Largo, O.; López, F.A. On the Adsorption of Cerium(III) Using Multiwalled Carbon Nanotubes. Metals 2020, 10, 1057.

Journal reference: Metals 2020, 10, 1057
DOI: 10.3390/met10081057

Abstract

Commercially available oxidized (carboxylic groups) and non-oxidized multiwalled carbon nanotubes were studied as adsorbents of cerium(III) in batch operation mode. Several variables affecting the rare earth adsorption were investigated, including: the stirring speed applied to the system, the pH of the solution and the metal concentration and carbon dosages. Although the removal of cerium from the solution is different and dependent upon the adsorbent type: i) adsorption in non-oxidized multiwalled carbon nanotubes, ii) cation exchange in the case of using oxidized multiwalled carbon nanotubes, the adsorption kinetics, the rate law and the isotherm models are the same for both adsorbents: pseudo-second order, film diffusion and Langmuir Type-1, respectively. Cerium is desorbed from loaded adsorbents using acidic solutions.

Subject Areas

adsorption; carbon nanotubes; rare earth

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