Cooperative effect of 2-(dibutylcarbamoyl)benzoic acid and 2-thenoyltrifluoroacetone for the synergistic extraction of lanthanide ions

Safarbali, Reyhaneh; Yaftian, Mohammad Reza; Zamani, Abbasali

doi:10.1080/01496395.2016.1165252

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…One of the most important properties of those acidic extractants is their tunable extraction ability to the desired metal ions, which could be achieved by simply adjusting the pH of the aqueous phase solutions. Although organophosphorus extractants are considered effective ligands for RE extraction, they do have some certain drawbacks such as leaving behind phosphorus residues as byproducts and exhibiting low selectivity in the case of intragroup separation of REs. − Moreover, P507 and naphthenic acid have been found ineffective to separate REs from sulfate media due to emulsion formation . Also, the low selectivity of Cyanex 921 and the multistage stripping operations required for Cyanex 923 are considered as common drawbacks that may limit their uses in the industry .…”

Section: Introductionmentioning

confidence: 99%

Selective Extraction of Light Lanthanides(III) by N,N-Di(2-ethylhexyl)-diglycolamic Acid: A Comparative Study with N,N-Dimethyl-diglycolamic Acid as a Chelator in Aqueous Solutions

et al. 2019

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The complexation and selectivity of N,N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA/kerosene, HA) toward the light lanthanides, La(III), Ce(III), Pr(III), and Nd(III), are presented for the extraction from chloride media. In the low pH region (pH 1.8–2.8), the obtained data reveal that the extraction of Ln(III) is governed by cation-exchange mechanism and is driven by the negative change in enthalpy. The results from the slope analysis method suggest the formation of LnA3·(HA)1or2 in the extraction process. As major extracted species with a core of LnA3 in the first coordination sphere, LnA3 might connect with one or two additional HA molecules in the second coordination sphere by hydrogen bonding. The LnA3 core might share similar coordination geometry to those of 1:3 Ln(III) complexes (LnA′3) with water-soluble N,N-dimethyl-diglycolamic acid (HDMDGA, HA′) formed in aqueous solutions or in solid-state compounds. The correlation between the extraction with HDEHDGA (HA) as an extractant and the complexation with HDMDGA (HA′) as a chelator has been explored by interpreting the separation factors for HA with the difference in the stability constants for HA′. Consequently, the ratios of the stability constants of the corresponding 1:3 complexes (LnA′3) with HDMDGA could be reasonably translated to the separation factors (SFs) with HDEHDGA, providing a valuable approach for understanding the origin of the extraction/separation mechanism. By comparing the extraction selectivity of HDEHDGA with that of the currently deployed extractants in the industry such as P204, P507, and Cyanex 272, HDEHDGA offers outstanding selectivity with considerable SFs (SFCe/La = 6.68, SFPr/Ce = 2.79, and SFNd/Pr = 2.65) for light Ln(III) pairs under conditions of low acid concentrations.

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Section: Introductionmentioning

confidence: 99%

Selective Extraction of Light Lanthanides(III) by N,N-Di(2-ethylhexyl)-diglycolamic Acid: A Comparative Study with N,N-Dimethyl-diglycolamic Acid as a Chelator in Aqueous Solutions

et al. 2019

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“…It is generally known that the cation-exchange process is greatly affected by the acidity of the acidic extractant, and the extraction can be improved by increasing the acidity of the extractant. [22] The different extraction capacity of HA and CA12 may be ascribed to their different acidity. To verify it, the apparent pKa of HA and CA12 was tested in ethanol/water (50/ 50) mixed solvent by potentiometric titration with sodium hydroxide under constant ionic strength (0.1 mol L sodium chloride).…”

Section: Comparison Of Extracting Res With Ha and Ca12mentioning

confidence: 99%

“…Up to date, various types of extractants have been developed and applied in hydrometallurgy of REs. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Among these extractants, carboxylic acids are promising and have been applied in REs hydrometallurgy for years. However, the extraction ability of carboxylic acids is not satisfactory, and structure optimization and synergistic extraction systems have been adopted to improve the extraction ability of carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

Improved Extraction of Rare Earths of La, Ce, Pr, and Nd by Optimizing the Structure of Phenoxyacetic Acid

Zhang

Guo

et al. 2021

ChemistrySelect

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A novel extractant, 2‐(2‐heptanoylphenoxy)acetic acid (HA), was synthesized and applied to extract La, Ce, Pr, and Nd from the hydrochloric acid solution. The extraction parameters including pH, temperature, concentrations of HA and chloride ion were investigated and discussed in detail. The extraction mechanism was studied with Fourier‐transform infrared (FT‐IR) spectroscopy. Compared with the extractant of sec‐octylphenoxy acetic acid (CA12), HA showed excellent performance and different extraction order in extracting La, Ce, Pr, and Nd. All the rare‐earth metals (REs) were extracted by the cation exchange mechanism and loaded as REs(A)3. The stripping test showed that the loaded REs in the organic phase can be effectively stripped with sulfuric acid at medium acidity. This work revealed that HA is an effective extractant for REs.

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Selective extraction equilibria of Sc(III), Y(III), Fe(III) and Al(III) from acidic media with toluene mixture of deep eutectic solvent (DES) composed of TOPO and isostearic acid

et al. 2023

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Cooperative effect of 2-(dibutylcarbamoyl)benzoic acid and 2-thenoyltrifluoroacetone for the synergistic extraction of lanthanide ions

Cited by 5 publications

References 33 publications

Selective Extraction of Light Lanthanides(III) by N,N-Di(2-ethylhexyl)-diglycolamic Acid: A Comparative Study with N,N-Dimethyl-diglycolamic Acid as a Chelator in Aqueous Solutions

Selective Extraction of Light Lanthanides(III) by N,N-Di(2-ethylhexyl)-diglycolamic Acid: A Comparative Study with N,N-Dimethyl-diglycolamic Acid as a Chelator in Aqueous Solutions

Improved Extraction of Rare Earths of La, Ce, Pr, and Nd by Optimizing the Structure of Phenoxyacetic Acid

Selective extraction equilibria of Sc(III), Y(III), Fe(III) and Al(III) from acidic media with toluene mixture of deep eutectic solvent (DES) composed of TOPO and isostearic acid

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