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

Abstract

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.

Adsorption-based Separation and Recovery of Rare Earth Elements

“…Carbon nanotubes (CNTs) are tubes of graphite sheets and can be divided into two types: Single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) with a set of concentric nanotubes. The examples of CNTs based adsorbent studied for REEs separation include oxidized MWCNTs (Alguacil et al, 2020;Behdani et al, 2013;Fan et al, 2009;Koochaki-Mohammadpour et al, 2014;K. Li et al, 2015), CNT modified with -COOH (Kilian et al, 2017), MWCNT modified with tannic acid (Tong et al, 2011), and MWCNT/Fe 3 O 4 composites (Chen et al, 2009;Fan et al, 2009).…”

Nd(III) sorption using aminophosphonate-based sorbents – Sorption properties and application to the treatment of REE concentrate

“…different techniques can be used [15,16]: precipitation [14], solvent extraction ( [17][18][19][20], relayed supported membranes [21,22] and impregnated resins systems [23]). Chelating resins [24][25][26], ion-exchange resins [27,28], or carbon-based sorbents [29,30] are frequently offering competitive solutions for the treatment of dilute solutions. The selectivity for target metals can be enhanced using ion-imprinted materials such as resins [31] or functionalized silica-based composite [32].…”

Enhancement of Cerium Sorption onto Urea-Functionalized Magnetite Chitosan Microparticles by Sorbent Sulfonation—Application to Ore Leachate

“…Sorption processes are usually preferred to solvent extraction for the treatment of low-concentration effluents. A wide range of materials have been reported for cerium or REE sorption, including biosorbents [ 25 , 26 , 27 , 28 , 29 , 30 ], carbon-based supports [ 24 , 31 , 32 ], inorganic sorbents [ 33 , 34 ], and chelating and ionic-exchange resins [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”