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

García‐Díaz, Irene; Baquero, Esther Escudero; Largo, Olga Rodríguez; López, Félix A.

doi:10.3390/met10060765

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Linear fitting of functions c e /q e vs. c e , and lnq e vs. lnc e gave the parameters of the Langmuir and Freundlich models, respectively (Table 6). Additionally, the higher Fand R 2 values, as well as a lower p-value have shown that the Langmuir model is more suitable for the experimental data description than the Freundlich model, indicating that a homogeneous surface of adsorbent is covered with a single layer of adsorbed molecules [22].…”

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confidence: 99%

Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer

Marjanović

Perić-Grujić

Ristić

et al. 2020

Metals

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Hybrid adsorbent, based on the cross-linked copolymer impregnated with hydrous iron oxide, was applied for the first time for Se(VI) adsorption from water. The influence of the initial solution pH, selenate concentration and contact time to adsorption capacity was investigated. Adsorbent regeneration was explored using a full factorial experimental design in order to optimize the volume, initial pH value and concentration of the applied NaCl solution as a reagent. Equilibrium state was described using the Langmuir model, while kinetics fitted the pseudo-first order. The maximum adsorption capacity was found to be 28.8 mg/g. Desorption efficiency increased up to 70%, and became statistically significant with the reagent concentration and pH increase, while the applied solution volume was found to be insignificant in the investigated range. Based on the results obtained, pH influence to the adsorption capacity, desorption efficiency, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) analysis of loaded adsorbent, it was concluded that the outer- and inner-sphere complexation are mechanisms responsible for Se(VI) separation from water. In addition to the experiments with synthetic solutions, the adsorbent performances in drinking water samples were explored, showing the purification efficiency up to 25%, depending on the initial Se(VI) concentration and water pH. Determined sorption capacity of the cross-linked copolymer impregnated with hydrous iron oxide and its ability for regeneration, candidate this material for further research, as a promising anionic species sorbent.

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confidence: 99%

Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer

Marjanović

Perić-Grujić

Ristić

et al. 2020

Metals

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“…Solvent extraction is highly attractive for the recovery of valuable metals at high relative concentrations [1,3]; however, environmental impact (associated with organic losses) and economic constraints may limit its application in the case of dilute effluents. Ionexchange [4][5][6], chelating resins [7,8], impregnated resins [9], nanomaterials [10], carbon-based sorbents [11] or metal organic framework [12] offer complementary possibilities for the recovery of valuable metals from low-concentration solutions (less than 200 mg L − 1 ). Alternative materials proceeding from natural sources (biopolymers, biomass) have been used directly for the recovery of valuable metals [13,14 15,16] or after functionalization [17].…”

Section: Introductionmentioning

confidence: 99%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3-4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g − 1 and 2.09 mmol Mo(VI) g − 1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30-40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5-3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).

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“…From several years ago, we have used the two particular adsorbents mentioned below in the removal of several metals from aqueous solutions [4,[34][35][36][37][38]. The reason is that both materials are easily accessible in the market and, based in our experience, represented good alternatives with respect to other adsorbents, at least in terms of availability and price.…”

Section: Introductionmentioning

confidence: 99%

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

García‐Díaz

Baquero

Largo

et al. 2020

Metals

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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.

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

Cited by 6 publications

References 43 publications

Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer

Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

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

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