Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

Khawassek, Yasser; Eliwa, Ahmed A.; Haggag, El Sayed A.; Omar, Sayed; Abdelwahab, Sherif

doi:10.1007/s42452-018-0051-6

Cited by 38 publications

(15 citation statements)

References 25 publications

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“…Finally, no REEs were measured in solution in the oxalic acid experiment, unlike Al, Ti, Sc, and a small amount of Fe. This was not surprising since oxalic acid is often used in industrial processes to precipitate the REEs as insoluble metal-oxalate complexes [26][27][28][29] . In our study, it was not possible to quantify the amount of REEs that reacted with oxalic acid.…”

Section: Ligand-dependent Dissolutionmentioning

confidence: 99%

Potential of Ligand-Promoted Dissolution at Mild pH for the Selective Recovery of Rare Earth Elements in Bauxite Residues

Lallemand

Ambrosi

Borschneck

et al. 2022

ACS Sustainable Chem. Eng.

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In a context of overexploitation of natural resources, a circular economy and particularly the extraction of resources from secondary sources, are essential to sustain a number of key technologies including renewable energies. Among secondary sources, bauxite residue contains critical elements including rare earth elements (REEs) (712mg/kg). We investigated the use of soft and selective dissolution protocols at mild pHs (2-6) as an alternative to pyroand hydrometallurgy for the recovery of REEs through ligand-promoted dissolution. This approach depends on the detailed characterization of the waste and the speciation of targeted elements. We assessed dissolution using low molecular weight organic acids (LMWOAs) and their conjugate bases. Citric acid/citrate showed satisfactory dissolution of REEs (up to 50% of light REEs) up to a pH of nearly 5, while tartaric acid/tartrate showed the best dissolution selectivity (enrichment factor up to 21.5 compared to Fe, Al and Ti). Almost no heavy REEs were dissolved in any of the conditions tested, probably due to the high chemical stability of their bearing phases. Indeed, heavy REEs were found as discrete phosphate particles. SynopsisLigand-promoted dissolution, an interesting mechanism for the development of selective recovery processes of REEs from bauxite residue in mild pH conditions.

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Section: Ligand-dependent Dissolutionmentioning

confidence: 99%

Potential of Ligand-Promoted Dissolution at Mild pH for the Selective Recovery of Rare Earth Elements in Bauxite Residues

Lallemand

Ambrosi

Borschneck

et al. 2022

ACS Sustainable Chem. Eng.

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“…The adsorption equilibrium parameters of La(III) and Ni(II) ions adsorption onto Lewatit Monoplus SP112 were determined using the following equations: a) the Langmuir isotherm model: C e q e = 1 K L q m + C e q m (21) b) the Freundlich isotherm model:…”

Section: Isotherm Parametersmentioning

confidence: 99%

“…To this end ion exchange, solvent extraction, combined ion exchange/solvent extraction or liquid membrane processes can be applied [14][15][16][17]. In recent years many commercially available ion exchangers such as Amberlyst 15 [18], Amberlite IRC-748 [19], DOWEX C-500 [20], Dowex 50 × 8 [21], Purolite C-100 [22], or KU-2-8 [23] were used for heavy metal ions and rare earths removal from various types of wastes. For example Xu et al [24] studied Co, Nd and Dy separations from the spent NdFeB permanent magnets using the am-ZrP/PAN composite ion exchanger.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Lanthanum(III) and Nickel(II) Ions from Acidic Solutions by the Highly Effective Ion Exchanger

2020

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The recovery of La(III) and Ni(II) ions by a macroporous cation exchanger in sodium form (Lewatit Monoplus SP112) has been studied in batch experiments under varying HNO3 concentrations (0.2–2.0 mol/dm3), La(III) and Ni(II) concentrations (25–200 mg/dm3), phase contact time (1–360 min), temperature (293–333 K), and resin mass (0.1–0.5 g). The experimental data revealed that the sorption process was dependent on all parameters used. The maximum sorption capacities were found at CHNO3 = 0.2 mol/dm3, m = 0.1 g, and T = 333 K. The kinetic data indicate that the sorption followed the pseudo-second order and film diffusion models. The sorption equilibrium time was reached at approximately 30 and 60 min for La(III) and Ni(II) ions, respectively. The equilibrium isotherm data were best fitted with the Langmuir model. The maximum monolayer capacities of Lewatit Monoplus SP112 were equal to 95.34 and 60.81 mg/g for La(III) and Ni(II) ions, respectively. The thermodynamic parameters showed that the sorption process was endothermic and spontaneous. Moreover, dynamic experiments were performed using the columns set. The resin regeneration was made using HCl and HNO3 solutions, and the desorption results exhibited effective regeneration. The ATR/FT-IR and XPS spectroscopy results indicated that the La(III) and Ni(II) ions were coordinated with the sulfonate groups.

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“…Thermodynamic parameters are necessary to determine the spontaneity and heat exchange of adsorption. The thermodynamic parameters included change in Gibbs free energy (∆ G ), enthalpy (∆ H ), and entropy (∆ S ), which were determined using Equations (8)–(10) [ 38 , 39 , 40 ]. The fitted plots are shown in Figure 10 and the results are presented in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

Preparation of a Novel Polystyrene-Poly(hydroxamic Acid) Copolymer and Its Adsorption Properties for Rare Earth Metal Ions

Cao

Wang

et al. 2020

Polymers

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In this study, a novel polystyrene-poly(hydroxamic acid) copolymer was synthesized as an effective adsorbent for the treatment of rare earth elements. Through the use of elemental analysis as well as FTIR, SEM, XPS, and Brunauer-Emmett-Teller (BET) surface area measurement, the synthesized polymer was found to have a specific surface area of 111.4 m2·g−1. The adsorption performances of rare metal ions were investigated under different pH levels, contact times, initial concentrations of rare earth ions, and temperatures. The adsorption equilibrium for La3+, Ce3+, and Y3+ onto a polystyrene-poly(hydroxamic acid) copolymer is described by the Langmuir model, which confirms the applicability of monolayer coverage of rare earth ions onto a polystyrene-poly(hydroxamic acid) copolymer. The amount of adsorption capacities for La3+, Ce3+, and Y3+ reached 1.27, 1.53, and 1.83 mmol·g−1 within four hours, respectively. The adsorption process was controlled by liquid film diffusion, particle diffusion, and chemical reaction simultaneously. The thermodynamic parameters, including the change of Gibbs free energy (∆G), the change of enthalpy (∆H), and the change of entropy (∆S), were determined. The results indicate that the adsorption of resins for La3+, Ce3+ and Y3+ was spontaneous and endothermic. The polymer was also used as a recyclable adsorbent by the desorption experiment.

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Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

Cited by 38 publications

References 25 publications

Potential of Ligand-Promoted Dissolution at Mild pH for the Selective Recovery of Rare Earth Elements in Bauxite Residues

Potential of Ligand-Promoted Dissolution at Mild pH for the Selective Recovery of Rare Earth Elements in Bauxite Residues

Recovery of Lanthanum(III) and Nickel(II) Ions from Acidic Solutions by the Highly Effective Ion Exchanger

Preparation of a Novel Polystyrene-Poly(hydroxamic Acid) Copolymer and Its Adsorption Properties for Rare Earth Metal Ions

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