Solvent Extraction of Several Divalent Metal Ions with Benzoyltrifluoroacetone and 2-Thenoyltrifluoroacetone into Chloroform in the Presence of Tetrabutylammonium Ions

The solvent extraction of silver(I) in aqueous 0.1 mol dm-3 sodium nitrate solutions with 2-thenoyltrifluoroacetone (Htta) and 4-isopropyltropolone (f3-isopropyltropolone, Hipt) into chloroform was studied in the absence and presence of tetrabutylammonium ions (tba+), and the results were compared. Although extraction with Htta was poor, it was very much enhanced and nearly quantitative extraction was achieved by the addition of tba+. This was assumed to be due to the fact that the complex, Ag(tta), was hydrophilic due to its hydration, but tba+Ag(tta)2-, which was extracted in the presence of tba+, was very weakly hydrated and bulkier. Both Ag(ipt) and Ag(ipt)(Hipt) were extracted; extraction with Hipt was not very effective in the absence of tba+. By the addition of tba+, the anionic complex, tba+Ag(ipt)2-, was also extracted, and nearly quantitative extraction was also achieved. Since the formation of this anionic complex is made by an exchange of ipt-with Hipt of the Ag(ipt)(Hipt) species, the enhancement of extraction was impaired by the dissociation of Hipt from the self-adduct.

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“…Figure 4 gives the results treated on the basis of Eqs. (15) and (16). As can be seen from By analyzing the data in Fig.…”

Section: Solvent Extraction Of Silver(i) With Httamentioning

confidence: 88%

“…Such association constants are also reported with divalent metal ions in ref. 16 and with europium(III) in ref. 17.…”

Section: Discussionmentioning

confidence: 99%

Solvent Extraction of Silver(I) as Anionic Metal Complexes with 2-Thenoyltrifluoroacetone and 4-Isopropyltropolone into Chloroform in the Presence of Tetrabutylammonium Ions

Ohmiya

Sekine

1996

ANAL. SCI.

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“…It is well known that TTA forms adduct or ion-pair with trioctylphosphine oxide (TOPO) to create a synergistic effect, which increases the extraction efficiencies of metallic ions. Many researchers studied solvent extraction of metallic ions using TTA and TOPO [7][8][9][10][11][12][13][14][15][16]. Noro and Sekine [11] studied the synergistic extraction of lanthanide using TTA with TOPO or tetrabutylammonium ions (TBA ? )…”

Section: Introductionmentioning

confidence: 99%

“…and reported the distribution coefficient and equilibrium constant. Sekine et al [12][13][14][15] also performed several researches on the solvent extraction of metallic ions with the same extractants. Takazawa et al [16] reported thermodynamic study on the synergistic extraction of cobalt (II) with b-diketone and TTA.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction and stripping of lithium ion from aqueous solution and its application to seawater

Harvianto

Kim

2015

Rare Met.

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For the development of lithium ion recovery process from seawater, a series of experimental researches were performed. Solvent extraction of lithium ion from aqueous solution using kerosene as solvent was proposed. Lithium ion is effectively extracted by thenoyltrifluoroacetone-trioctylphosphine oxide (TTA-TOPO) in kerosene within 80 min. Extraction efficiency is severely influenced by stoichiometric parameters. Among the stoichiometric parameters, volume ratio of aqueous (A) to extraction (E) solution is the most influential parameter. After extraction, lithium ion could be easily stripped from the extraction solution by acidic solutions. Stripping efficiency decreases with pH of acidic solutions, and the kind of acid does not affect the stripping efficiency. Extraction efficiency maintains at more than 93 % even when the extraction solution is recycled three times. 65 % of lithium ion can be extracted from seawater by this solvent extraction process when magnesium ion is precipitated by NH 4 OH prior to solvent extraction process. Other metallic ions in seawater decrease the extraction efficiency of lithium ion.

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“…Zinc(II) b-diketonates and monothio-b-diketonates have also been widely studied and used as precursors for metal organic chemical vapour deposition (MOCVD) [12] where they are promising compounds for the production of high-quality films of oxide semiconductors of ZnO or ZnS [13]. b-Diketones and thio-b-diketones have also been used in solvent extraction studies of systems involving Zn(II) and other divalent metals as Cu(II), Ni(II), Cd(II) [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Standard molar enthalpies of formation of zinc(II) β-diketonates and monothio-β-diketonates

Silva

Santos

Giera

2008

The Journal of Chemical Thermodynamics

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Keywords: Standard molar enthalpy of formation Enthalpy of dehydration High temperature Calvet microcalorimetry Zinc(II) b-diketonates Zinc(II) monothio-b-diketonates Solution calorimetry Zn(II)-ligand mean molar dissociation enthalpies Bis(dibenzoylmethanate)zinc(II) Bis(thenoyltrifluoroacetonate)zinc(II) Diaquobis (thenoyltrifluoroacetonate) zinc(II) Bis(mono-thiodibenzoylmethanate)zinc(II) Bis[monothiothenoyltrifluoroacetonate] zinc(II) a b s t r a c tThe standard (p = 0.1 MPa) molar enthalpies of formation of crystalline bis(dibenzoylmethanate)zinc(II), Zn(DBM) 2 , diaquobis(thenoyltrifluoroacetonate)zinc(II), Zn(TTFA) 2 (H 2 O) 2 , bis(monothiodibenzoylmethanate)zinc(II), Zn(HDBMS) 2 , and bis(monothio-thenoyltrifluoroacetonate)zinc(II), Zn(HTTFAS) 2 , were determined, at T = 298.15 K, by high precision solution-reaction calorimetry. The standard molar enthalpy of dehydration of the diaquobis(thenoyltrifluoroacetonate)zinc(II), Zn(TTFA) 2 (H 2 O) 2 , complex was measured by high-temperature Calvet microcalorimetry. From the standard molar enthalpies of formation of the complexes in the gaseous state, the mean molar dissociation enthalpies zinc(II)-ligand, hD m i(Zn-L), were derived.kJÁmol À1 Bis(dibenzoylmethanate)zinc(II), Zn(DBM) 2 À546.9 ± 4.0 Diaquobis(thenoyltrifluoroacetonate)zinc(II), Zn(TTFA) 2 (H 2 O) 2 À2556.2 ± 8.4 Bis(monothiodibenzoylmethanate)zinc(II), Zn(DBMS) 2À107.0 ± 5.9 Bis(monothiothenoyltrifluoroacetonate)zinc(II), Zn(TTFAS) 2 À1563.6 ± 8.0

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Solvent Extraction of Several Divalent Metal Ions with Benzoyltrifluoroacetone and 2-Thenoyltrifluoroacetone into Chloroform in the Presence of Tetrabutylammonium Ions

Cited by 15 publications

References 24 publications

Solvent Extraction of Silver(I) as Anionic Metal Complexes with 2-Thenoyltrifluoroacetone and 4-Isopropyltropolone into Chloroform in the Presence of Tetrabutylammonium Ions

Solvent Extraction of Silver(I) as Anionic Metal Complexes with 2-Thenoyltrifluoroacetone and 4-Isopropyltropolone into Chloroform in the Presence of Tetrabutylammonium Ions

Solvent extraction and stripping of lithium ion from aqueous solution and its application to seawater

Standard molar enthalpies of formation of zinc(II) β-diketonates and monothio-β-diketonates

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