Specific extraction behavior of amide derivative of calix[4]arene for silver (I) and gold (III) ions from highly acidic chloride media

Ohto, Keisuke; Yamaga, Hiroshi; Murakami, Emi; Inoue, Katsutoshi

doi:10.1016/s0039-9140(97)00019-2

Cited by 64 publications

(30 citation statements)

References 18 publications

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“…In these studies, silver(I) has been investigated more frequently than the other metals [5][6][7], including palladium and platinum and heavy metals alone or in mixtures with different noble metals [5,7]. It was found that alkali and alkaline earth metals would be coextracted readily with most calixarenes [2,4,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

et al. 2007

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Results are reported, providing the basis for an elegant new process for metal recovery from acidic solutions, by integrating solvent extraction (SX) and electrowinning (EW) in a single process, rather than operating them separately, as in conventional SX-EW processes. Calixarene-tetramide and its thio-analogue were used for the extraction of silver(I) ions from aqueous phases into dichloromethane, both compounds achieving extraction efficiencies [90%. The effects were determined of extractant and silver(I) concentrations, aqueous phase pH, and the presence of sodium ions, on the distribution of Ag(I) between aqueous and organic phases. Due to the impossibility of stripping the extracted metal conventionally, electro-reductive stripping of silver(I) from the loaded organic phase was carried out in the calixarene/nitric acid two-phase system. The effects were also investigated of current density or electrode potential on silver deposition current efficiencies and cell voltages. Based on experimental data, a new process for silver(I) removal from very dilute solutions was proposed that showed high percentage extractions of silver(I) from the aqueous phase, coupled to direct EW of silver from the calixarene complex in the loaded organic phase, regenerating the extractant for recycle. Current efficiencies in the range from 60% to 90% and cell voltages \3.5 V were achieved simultaneously in this process.

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Section: Introductionmentioning

confidence: 99%

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

et al. 2007

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“…These extractants systems were well characterized in terms of Ag(I) extraction, but no data are provided in relation to selectivity of Ag(I) extraction to other metals. The resulting extraction recoveries were at low levels, only calix [4]arene obtained an Ag(I) extraction degree of 60% at low acid concentrations [17,18].…”

Section: Introductionmentioning

confidence: 93%

Studies of extractive removal of silver(I) from chloride solutions

Wejman-Gibas

Pilśniak-Rabiega

2016

E3S Web Conf.

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Abstract. For efficient recovery of silver(I) from chloride solutions, amine extractants were used. The effect of the type of diluent, extractant and chloride concentration, contact time and reextraction were studied. It was found that the best diluent for this process was xylene. Extraction of silver depended on concentration of hydrochloric acid, sodium chloride and extractant and additionally on the contact time. Reextraction of Ag(I) ions from the loaded organic phase showed that it can be removed only little using NH3 H2O, NaOH, NH4NO3, and NaNO3 as the stripping agents.

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“…These results supported that the extraction of copper and iron is not driven by an ion-exchange mechanism, but by coordination. [20,21]. )…”

Section: Extraction Of Precious Metals With the Dithioether Type Of Tmentioning

confidence: 99%

Precious Metal Extraction with Thiol and Dithioether Derivatives of a Trident Molecule

Ohto

Furugou

Yoshinaga

et al. 2017

SERDJ

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Thiol and dithioether derivatives of tripodal extraction reagents have been newly prepared and employed to investigate the extraction behavior of precious metals. Both sulfur-containing compounds did not exhibit a pH dependency for precious metal extraction. The thiol type derivative exhibited a high extraction ability for gold(III), silver and palladium(II), and a 1 : 3 (extractant : metal) stoichiometry for gold(III) and silver.The results showed that the thiol derivative exhibited little structural effect due to the strong functionality of thiol group. The dithioether derivative also extracted gold(III), silver and palladium(II), however the silver extraction is caused by the structural effect of the tripodal framework, while gold(III) and palladium(II) extraction is probably attributed to a partial structural effect. The tripodal derivative possesses a high extraction ability compared with the corresponding monopodal compound. Tripodal and monopodal derivatives showed 1 : 1 and 1 : 2 (extractant : metal) stoichiometry for silver. This means that the tripodal derivative exhibited the structural effect as a size effect, converging effect of the multi functionality, complementary effect. The coordination site of the tripodal derivative was confirmed by 1 H-NMR spectra before and after the silver loading. Stripping of the loaded silver from the tripodal derivative was also investigated. Finally, the stepwise separation of silver and palladium(II) was carried out and roughly achieved by using different eluents.

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Specific extraction behavior of amide derivative of calix[4]arene for silver (I) and gold (III) ions from highly acidic chloride media

Cited by 64 publications

References 18 publications

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

Studies of extractive removal of silver(I) from chloride solutions

Precious Metal Extraction with Thiol and Dithioether Derivatives of a Trident Molecule

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