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

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1057
Author(s):  
Francisco José Alguacil ◽  
Irene García-Díaz ◽  
Esther Escudero Baquero ◽  
Olga Rodríguez Largo ◽  
Félix Antonio López
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Operation Mode ◽  
Isotherm Models ◽  
Type I ◽  
Multiwalled Carbon ◽  
Carboxylic Groups ◽  
Pseudo Second Order ◽  
Oxidized Multiwalled Carbon Nanotubes

Commercially available oxidized (carboxylic groups) and nonoxidized 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 nonoxidized 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.

scholarly journals Oxidized and Non-Oxidized Multiwalled Carbon Nanotubes as Materials for Adsorption of Lanthanum(III) Aqueous Solutions

2020 ◽  
Author(s):  
Francisco J. Alguacil ◽  
Irene García-Díaz ◽  
Esther Escudero Baquero ◽  
Olga Rodríguez Largo ◽  
Félix Antonio López
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Multiwalled Carbon Nanotubes ◽  
Metal Uptake ◽  
Isotherm Models ◽  
Particle Diffusion ◽  
Acid Solutions ◽  
Multiwalled Carbon ◽  
Several Variables ◽  
Oxidized Multiwalled Carbon Nanotubes

The behaviour of oxidized and non-oxidized multiwalled carbon nanotubes in the adsorption of lanthanum(III) from aqueous solutions is described. Metal uptake is studied as a function of several variables such as the stirring speed of the system, pH of the aqueous solution and metal and nanomaterial concentrations. The experimental results are fitted to various kinetics and isotherm models, being the rate law fitted to the film diffusion and particle diffusion models, when the non-oxidized and the oxidized nanomaterials are used to remove lanthanum from the solution, respectively. Sulphuric acid solutions seem to be appropriate to recover the metal from La-loaded nanomaterials.

scholarly journals Oxidized and Non-Oxidized Multiwalled Carbon Nanotubes as Materials for Adsorption of Lanthanum(III) Aqueous Solutions

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 765 ◽  
Author(s):  
Francisco J. Alguacil ◽  
Irene García-Díaz ◽  
Esther Escudero Baquero ◽  
Olga Rodríguez Largo ◽  
Félix A. López
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Multiwalled Carbon Nanotubes ◽  
Metal Uptake ◽  
Isotherm Models ◽  
Particle Diffusion ◽  
Multiwalled Carbon ◽  
Several Variables ◽  
Sulfuric Acid Solutions ◽  
Oxidized Multiwalled Carbon Nanotubes

The behavior of oxidized and non-oxidized multiwalled carbon nanotubes (MWCNTs) in the adsorption of lanthanum(III) from aqueous solutions is described. Metal uptake is studied as a function of several variables such as the stirring speed of the system, pH of the aqueous solution and metal and nanomaterial concentrations. The experimental results are fitted to various kinetic and isotherm models, the rate law being fitted to the film diffusion and particle diffusion models, when the non-oxidized and the oxidized nanomaterials are used to remove lanthanum from the solution, respectively. Sulfuric acid solutions seem to be appropriate to recover the metal from La-loaded nanomaterials.

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