Solvent Extraction of Rhenium(vii) With Crown Ethers and Some Univalent Cations

Zhang, Xianxin; Zhou, Zhixian; Ma, Shejun; Chen, Shu

doi:10.1080/07366299308918175

Cited by 22 publications

(10 citation statements)

References 14 publications

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“…The similar chemical behaviors and properties of rhenium and molybdenum make the separation quite difficult [1]. Various techniques such as solvent extraction [2,3], ion exchange [4,5], chemical precipitation [6], and adsorption [7,8] have been used extensively for the recovery of rhenium and molybdenum. Moreover, adsorption techniques have gained favor recently due to their efficiency in the removal [9,10].…”

Section: Introductionmentioning

confidence: 99%

Highly enhanced selectivity for the separation of rhenium and molybdenum using amino-functionalized magnetic Cu-ferrites

Yang

Liu

et al. 2015

J Mater Sci

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An effective method based on magnetic solidphase extraction for the selective recovery of rhenium and molybdenum has been developed using diethylaminefunctionalized magnetic CuFe 2 O 4 (NH 2 @CuFe 2 O 4 ) as adsorbents. Various experimental parameters that could affect the extraction efficiency had been investigated in detail. NH 2 @CuFe 2 O 4 exhibited high adsorption ability and selectivity to ReO À 4 and MoO 2À 4 ; selective separation of ReO À 4 and MoO 2À 4 could be achieved by adjusting pH of the aqueous solution. The ReO À 4 =MoO 2À 4 adsorption reaction was found to be fast, and the adsorption equilibrium was attained within 6.0 min following a pseudo-secondorder model with an observed rate constant (k 2 ) of 0.0215 mgÁg -1 Ámin -1 /0.0496 mgÁg -1 Ámin -1 at 298 K. The adsorption data could be well interpreted by the Langmuir model. The maximum adsorption capacities for ReO À 4 and MoO 2À 4 obtained from the Langmuir model are 41.667 and 62.893 mg g -1 , respectively. The extraction recovery of ReO À 4 =MoO 2À 4 was more than 93 % from Mo-Re simulated industrial leach liquor.

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Section: Introductionmentioning

confidence: 99%

Highly enhanced selectivity for the separation of rhenium and molybdenum using amino-functionalized magnetic Cu-ferrites

Yang

Liu

et al. 2015

J Mater Sci

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“…[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] Many investigators have studied solvent extraction of rhenium from aqueous media containing…”

Section: Chemical Equilibria a Commercial Methods For Recovery Of mentioning

confidence: 99%

Thermodynamics of extraction of Re O−4 from aqueous sulfuric acid media with Tri-n-butyl phosphate dissolved in kerosene

Sadrnezhaad

Alamdari

2001

Metall Mater Trans B

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Rhenium distribution between Tri-n-butyl phosphate (TBP) dissolved in kerosene and sulfuric aqueous media is investigated under different temperatures, acidities, and TBP concentrations. Results show an exothermic extraction reaction with a distribution factor that decreases with the increase of the temperature and increases with the increase of the acidity and the TBP concentration. The stoichiometry of the reaction indicates neutralization of 1 mole of H + with 1 mole of ReO Ϫ 4 and solvating of a neutral molecule with four molecules of TBP. The structure of the complexes formed is, therefore, 4TBP и HReO 4 . The apparent Gibbs free energy of the formation of 4TBP и HReO 4 from TBP, ReO Ϫ 4 , and H + is determined to be equal to Ϫ66,989 ϩ 219.8 T J/mole.

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“…The extracted complexes (R 2 NH 2 Cl) 3 AEHReO 4 is more prone to form the final synergistic complex (R 2 NH 2 Cl) 3 AEHReO 4 AEB. A possible explanation is that the extracted complex of (RO) 3 P=O with Mo(VI) is less stable than that with Re(VII), consequently, the substitutional reaction of (RO) 3 P=O with (R 2 NH 2 Cl) 3 AEHReO 4 is easier than that of (R 2 NH 2 Cl) 3/ 2 AEH 2 MoO 4 AE1/4B.…”

Section: Extraction Mechanism Of Rhenium(vii) and Molybdenum(vi) Withmentioning

confidence: 97%

“…[1] Lots of methods are used to purify and separate these elements, such as chemical deposition, ion exchange, capillary electrophoresis, liquid chromatography, and solvent extraction. [2][3][4][5] Among them, liquid-liquid extraction provides an effective and simple separation method. [6][7][8][9][10][11] However, the separation of rhenium from molybdenum in aqueous solution is difficult because of their similar chemical behavior, and also has always been a problem in hydrometallurgy.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Extraction of Rhenium(VII) and Molybdenum(VI) with Mixtures of Bis-(3,5-dimethylhexyl-4-methylhexyl) Amine and Tributylphosphate

Xiong

Shan

Lou

et al. 2011

J. Phase Equilib. Diffus.

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The extraction of rhenium(VII) and molybdenum(VI) from chloride media by mixtures of bis-(3,5-dimethylhexyl-4-methylhexyl) amine N298 and tributylphosphate (TBP) was studied in the present paper. The mixtures had higher synergistic effects on Re(VII) than that of Mo(VI), and the maximal synergistic factor was obtained at a ratio of N298 to TBP of 1 to 9. Re(VII) was extracted as (R 2 NH 2 Cl) 3 AEHReO 4 AEB, whereas Mo(VI) was extracted as (R 2 NH 2 Cl) 1/2 AEH 2 MoO 4 AE1/ 4B by the mixtures, instead of (R 2 NH 2 Cl) 3 AEHReO 4 and (R 2 NH 2 Cl) 3 AEH 2 MoO 4 by N298 alone. Furthermore, the formation constants and extraction mechanism were determined. The possibility of separating rhenium and molybdenum ions by the mixtures according to its synergistic effects and extraction ability was investigated.

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Solvent Extraction of Rhenium(vii) With Crown Ethers and Some Univalent Cations

Cited by 22 publications

References 14 publications

Highly enhanced selectivity for the separation of rhenium and molybdenum using amino-functionalized magnetic Cu-ferrites

Highly enhanced selectivity for the separation of rhenium and molybdenum using amino-functionalized magnetic Cu-ferrites

Thermodynamics of extraction of Re O−4 from aqueous sulfuric acid media with Tri-n-butyl phosphate dissolved in kerosene

Synergistic Extraction of Rhenium(VII) and Molybdenum(VI) with Mixtures of Bis-(3,5-dimethylhexyl-4-methylhexyl) Amine and Tributylphosphate

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