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Cauzzi, Daniele; Graiff, Claudia; Massera, Chiara; Predieri, Giovanni; Tiripicchio, António

doi:10.1023/a:1016639516345

Cited by 44 publications

(72 citation statements)

References 7 publications

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“…4. The initial extraction rate, Rf (mol cm -2 s -1 ) is defined as follows: (6) where CPd,org is the palladium(II) concentration in the organic phase. As is shown in Fig.…”

Section: Extraction Rate Of Palladium (1) Effect Of Hydrogen Ion Chlmentioning

confidence: 99%

“…[1][2][3][4] Solvent extraction of metal ions with chelate agents such as LIX series reagents has recently attracted interest through hydrometallurgical and waste-water treatment processes. [5][6][7][8][9] An extractant containing sulfur as a donor atom has a high selectivity for platinum metals. Few works on the extraction reactions with such an extractant have been carried out.…”

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confidence: 99%

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Extraction Mechanism for Palladium(II) from Hydrochloric Acid Solution with 2-Dodecylthiomethylpyridine Using a Stirred Transfer Cell

Iwakuma

Baba

2005

ANAL. SCI.

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The precious metals such as silver, gold, palladium and platinum are important metals in industries such as catalyst, battery and electronics. These metals have stimulated the investigation of separation and purification by solvent extraction techniques because very high purity of these metals is required in these industries. [1][2][3][4] Solvent extraction of metal ions with chelate agents such as LIX series reagents has recently attracted interest through hydrometallurgical and waste-water treatment processes. [5][6][7][8][9] An extractant containing sulfur as a donor atom has a high selectivity for platinum metals. Few works on the extraction reactions with such an extractant have been carried out. 10,11 Baba and Inoue 12,13 studied the mechanism of palladium extraction with dihexyl sulfide, concluding that the ratedetermining step was the reaction between the intermediate of trichloropalladium-extractant complex adsorbed at the interface and the extractant dissolved in the aqueous phase. In the case of 1,2-bis(tert-hexylthio)ethane, the rate-determining step was the reaction of the extractant dissolved in the aqueous phase with PdCl3 -and PdCl4 2-in the aqueous phase, because 1,2-bis(terthexylthio)ethane had no interfacial activity and its aqueous solubility was relatively high.A previous paper 14 reported that t-hexadecylthiomethylpyridine (DTMP) including nitrogen and sulfur atoms has a high affinity for palladium, platinum and silver from an ammonium nitrate solution. In this study, the extraction rate of palladium with 2-dodecylthiomethylpyridine (DTP) from hydrochloric acid was examined using a stirred transfer cell. Measurements of palladium-loading capacity and aqueous solubility of extractant were also examined in order to elucidate the extraction mechanism. ExperimentalReagents 2-Dodecylthiomethylpyridine (DTP) was synthesized from ndodecylthiol and 2-chloromethylpyridine according to a conventional method. 14 The reaction mixture was evaporated. Water and chloroform were added to the reaction mixture and then the two phases were separated with a separatory funnel. Chloroform phase was successively washed using 0.1 mol dm -3 hydrochloric acid mixed with sodium chloride as a salting out reagent, 1.0 mol dm -3 aqueous sodium hydroxide and distilled water. The final product was a viscous brownish liquid. Identification of the purified product was carried out using 1 H-NMR, 13 C-NMR and FT-IR spectra. The product was identified as DTP and its purity was 97% as measured by gas chromatography. Selectivity of DTP for metal ionsThe aqueous phase was prepared by dissolving metal chloride into hydrochloric acid. The organic phase was prepared by dissolving with chloroform gravimetrically. Selectivity of metal ions was measured by a batchwise-method at 303 K for 24 h. 2-Dodecylthiomethylpyridine (DTP) was newly synthesized to study its extraction properties for precious metals. DTP was a selective extractant for palladium(II) and gold(III) over base metals. The loading test for palladium(II) showed that one pa...

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“…4. The initial extraction rate, Rf (mol cm -2 s -1 ) is defined as follows: (6) where CPd,org is the palladium(II) concentration in the organic phase. As is shown in Fig.…”

Section: Extraction Rate Of Palladium (1) Effect Of Hydrogen Ion Chlmentioning

confidence: 99%

mentioning

confidence: 99%

Extraction Mechanism for Palladium(II) from Hydrochloric Acid Solution with 2-Dodecylthiomethylpyridine Using a Stirred Transfer Cell

Iwakuma

Baba

2005

ANAL. SCI.

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“…In recent years we have carried out systematic investigations on the selenium-transfer reactions of tertiary phosphane and diphosphane selenides with carbonyl clusters MЈ 3 (CO) 12 (MЈ ϭ Fe or Ru).…”

Section: Introductionmentioning

confidence: 99%

“…reactions between preformed dimetallic clusters and tertiary phosphane selenides, [10] and (b) MЈSe ϩ M, i.e. cluster growth reactions between preformed chal-with the fragment W(CO) 5 through a selenido ligand. DFT calculations, performed on the model species [WRu 3 (µ 4 -Se) 2 (µ-CO) 4 (CO) 6 cogenide metal clusters and suitable organometallic fragments.…”

Section: Introductionmentioning

confidence: 99%

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Cluster Growth Reactions with Selenido‐Carbonyl Clusters − Synthesis, Characterisation and Theoretical Study of the Dimetallic closo Clusters [WRu₃(μ₄‐Se)₂(μ‐CO)₄(CO)₆(L)₂] (L = Phosphane) and of the Donor‐Acceptor Adduct [(CO)₅W(μ₄‐Se)Ru₃(μ₃‐Se)(CO)₇{P(CH₂Ph)Ph₂}₂]

et al. 2004

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Multiple Oxidative Addition of Ph2(C5H4N)PSe to [Ru3(CO)12] − Structural Characterization of [Ru3(µ3-Se)(µ-PPh2)2(µ-C5H4N)(µ3-C5H4N)(CO)6] Containing Two Differently Metalated 2-Pyridyl Fragments

Cauzzi

Graiff

Massera

et al. 2001

Eur. J. Inorg. Chem.

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The ligand Ph2(2‐C5H4N)PSe undergoes multiple fragmentation by reaction with [Ru3(CO)12] affording the 54‐electron trinuclear complex [Ru3(μ3‐Se)(μ‐PPh2)2(μ‐C5H4N)(μ3‐C5H4N)(CO)6] (1) which does not contain any Ru−Ru bond and is built up by a unique synergism of five bridging ligands. Complex 1 contains two bridging pyridyl groups: the first one connects two ruthenium atoms through σ bonds and lies on the plane defined by the three metals; the second one is also σ‐bound to two ruthenium atoms, and is nearly perpendicular to the metal plane in such a way that it appears to be involved in a weak π interaction with the third metal.

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Cited by 44 publications

References 7 publications

Extraction Mechanism for Palladium(II) from Hydrochloric Acid Solution with 2-Dodecylthiomethylpyridine Using a Stirred Transfer Cell

Extraction Mechanism for Palladium(II) from Hydrochloric Acid Solution with 2-Dodecylthiomethylpyridine Using a Stirred Transfer Cell

Multiple Oxidative Addition of Ph2(C5H4N)PSe to [Ru3(CO)12] − Structural Characterization of [Ru3(µ3-Se)(µ-PPh2)2(µ-C5H4N)(µ3-C5H4N)(CO)6] Containing Two Differently Metalated 2-Pyridyl Fragments

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Untitled

Cited by 44 publications

References 7 publications

Extraction Mechanism for Palladium(II) from Hydrochloric Acid Solution with 2-Dodecylthiomethylpyridine Using a Stirred Transfer Cell

Extraction Mechanism for Palladium(II) from Hydrochloric Acid Solution with 2-Dodecylthiomethylpyridine Using a Stirred Transfer Cell

Cluster Growth Reactions with Selenido‐Carbonyl Clusters − Synthesis, Characterisation and Theoretical Study of the Dimetallic closo Clusters [WRu3(μ4‐Se)2(μ‐CO)4(CO)6(L)2] (L = Phosphane) and of the Donor‐Acceptor Adduct [(CO)5W(μ4‐Se)Ru3(μ3‐Se)(CO)7{P(CH2Ph)Ph2}2]

Multiple Oxidative Addition of Ph2(C5H4N)PSe to [Ru3(CO)12] − Structural Characterization of [Ru3(µ3-Se)(µ-PPh2)2(µ-C5H4N)(µ3-C5H4N)(CO)6] Containing Two Differently Metalated 2-Pyridyl Fragments

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