Extraction-separation of Eu(III) and Th(IV) ions from nitrate media into a room-temperature ionic liquid

Shiri-Yekta, Zahra; Yaftian, Mohammad Reza; Nilchi, A.

doi:10.1007/s13738-012-0144-x

Cited by 15 publications

(5 citation statements)

References 32 publications

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Section: Introductionmentioning

confidence: 99%

“…As such, the extraction of metal ions by these ILs often occurs via an ion-exchange mechanism. [7][8][9][10][11][12][13] This means that the extraction process incurs the loss of IL components, which would not only increase the extraction cost but also hamper the regeneration of ILs. Furthermore, separation processes based on ion-exchange mechanisms lead to water contamination, especially in the case of the ILs containing fluoride.…”

Section: Introductionmentioning

confidence: 99%

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An ionic liquid-based synergistic extraction strategy for rare earths

Zhu

Zhao

et al. 2015

Green Chem.

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In this work, a novel IL-based synergistic extraction system utilizing the ionic liquid tricaprylmethylammonium nitrate ([A336][NO 3 ]) and the commercial extractant Di(2-ethylhexyl) 2-ethylhexyl phosphonate (DEHEHP) was developed for the extraction of rare earth (RE) nitrates. Pr(III) was used as a model RE and the effects of key factors, i.e. the ratio of [A336][NO 3 ] to DEHEHP, the acidity of feed solutions, and the concentration of a salting-out reagent, were systematically studied. Our results demonstrate that the mixture of [A336][NO 3 ] and DEHEHP had an obviously synergistic extraction effect for the extraction of Pr(III). The maximum synergistic enhancement coefficient of 3.44 was attained at X A = 0.4 (v%). Alternatively, mixture of [A336][Cl] and DEHEHP hardly extracted Pr(III) from chloride media. Moreover, we investigated the Pr(III) extraction mechanism and demonstrated that Pr(III) can be extracted as the neutral complexation species Pr(NO 3 ) 3 ﹒xDEHEHP and the ion-type species [A336] y ﹒Pr(NO 3 ) 3+y . These extraction processes can effectively hamper the release of organic cation-ligands into the aqueous phase. The synergistic extraction effect is mainly derived from the enhanced solubility of the extracted species in the ionic liquid phase. The extraction behaviors of Pr(III) could be properly described byLangmuir and pseudo-second-order rate equations. Increased temperature was unfavorable for the extraction reaction but greatly improved the extraction rate.Interestingly, the mixed IL extraction system has an obviously synergistic extraction effect for light REs (LREs, La -Eu), but an anti-synergistic effect for heavy REs (HREs, Gd -Lu, Y), thus, indicating that our synergistic extraction system is helpful for the separation of LREs from HREs. In addition, the high selectivity between REs and non-REs suggested that the recovery of REs from a complicated high-salt leachate could be highly possible. It demonstrates that the IL-based synergistic extraction strategy developed in this work is promising and sustainable, and as a result, the development of an IL-based synergistic extraction process for the recovery of REs is straightforwardly envisaged.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An ionic liquid-based synergistic extraction strategy for rare earths

Zhu

Zhao

et al. 2015

Green Chem.

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“…[11][12][13][14] Solvent extraction processes were the most interesting technique for separation and recovery of thorium. 15 Various extractants such as amines, [16][17][18] isoxazolones, crown ethers, 19 organophosphorus reagents 20 and ionic liquids 21,22 have been employed for the extraction of thorium and rare earth metals. Extracting a trace amount of thorium spectrophotometry has been introduced as a powerful technique due to its acceptable precision and accuracy, in addition to its lower cost compared to the other techniques.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Thorium in Standard Samples and Monazite Sands using Nornicotine Alkaloid

2020

TJNPR

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A rapid, sensitive, and selective method was developed for the quantitative determination of thorium concentration which is an important natural-mineral based on the complex formed with natural phytochemical nornicotine alkaloid at pH 4-6, the coloured complex was extracted in chloroform with a linear relationship in a concentration range from 6-50 µgmL-1 with molar absorptivity 1.8 x 10 4 (1 mol-1 cm-1), Sandell's sensitivity (µgcm-2) 2.3 × 10ˉ2, correlation coefficient 0.9998, limit of detection 0.57 µg ml-1 and limit of quantification 1.88 µg ml-1 at 430 nm. The effects of pH, nornicotine concentration, temperature and time were also studied. The method shows high selectivity for thorium and holds its accuracy and precision well. Therefore, the method is useful when applied to the determination of thorium in synthetic solution and in the monazite sample.

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“…In this case, the solvent extraction processes were the most interesting technique for separation and recovery of thorium [9]. Various extractants have been employed for the extraction of thorium and rare earths, such as organophosphorus reagents [10,11], amines [12][13][14], isoxazolones, crown ethers [15], fatty acid [16], and ionic liquids [17,18].…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Thorium Using 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene

Tran

Tán

Nguyen

2016

Journal of Chemistry

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A rapid, sensitive, and selective method for determination of thorium based on the complex with ortho-ester tetraazophenylcalix[4]arene (TEAC) was described. In the presence of pH of 4-6, TEAC-Th(IV) complex is extracted from an acidic aqueous solution into chloroform layer. The absorbance intensity of complex was measured by UV-Vis spectrometer at 525 nm and the molar absorptivity was found to be 2.4 × 10 4 . Beer's law was obeyed in the range of 1.0 to 25 × 10 −5 M thorium(IV). The effects of pH, TEAC concentration, and shaking time were also studied. The tolerance limits for several metal ions were calculated. The proposed method was applied to the determination of thorium in synthetic solution and in the monazite sand samples with good results.

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Extraction-separation of Eu(III) and Th(IV) ions from nitrate media into a room-temperature ionic liquid

Cited by 15 publications

References 32 publications

An ionic liquid-based synergistic extraction strategy for rare earths

An ionic liquid-based synergistic extraction strategy for rare earths

Quantitative Analysis of Thorium in Standard Samples and Monazite Sands using Nornicotine Alkaloid

Solvent Extraction of Thorium Using 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene

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