Selective extraction of silver(I) over palladium(II) with ketonic derivatives of calixarenes from highly concentrated nitric acid

Ohto, Keisuke; Murakami, Emi; Shinohara, Takaaki; Shiratsuchi, Koji; Inoue, Katsutoshi; Iwasaki, Mineto

doi:10.1016/s0003-2670(96)00555-7

Cited by 91 publications

(36 citation statements)

References 16 publications

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“…[18][19][20][21][22] Since the structures of the extractants significantly influence such physicochemical property and extraction behavior, macrocyclic compound such as calixarene derivatives are attractive. 23) In our previous work by the batchwise method, methyl ketonic 24) and 2-pyridyl 25) derivatives of pt-octylcalix [4]arene as extractants exhibited high extraction selectivity for silver among precious metals in nitrate media. However, silver extraction rates between two derivatives exhibited large difference.…”

Section: Introductionmentioning

confidence: 94%

Effect of Interfacial Activity on Silver Extraction Rate with Calix[4]arene Derivatives in Nitrate Media

Kim¹,

Morisada²,

Kawakita³

et al. 2014

J.I.E.

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arene derivatives as extraction reagents have been prepared to investigate silver extraction rate in nitrate media by batch-wise method. The interfacial tension was also measured by the drop volume method to investigate the effect of interfacial activity on silver extraction rate with the calix[4]arene derivatives in chloroform / nitric acid media by varying the concentrations of the extraction reagent and nitric acid. Interfacial activities of calix[4]arene derivatives were evaluated by comparing the obtained interfacial tension values. The interfacial excess and the average area per the adsorbed extractant molecule at chloroform / nitric acid interface were estimated from the Gibbs' adsorption equation and were used to investigate the relationship with silver extraction by using calix [4]arene derivatives in nitrate media. From the result, silver extraction rate with calix[4]arene derivatives in nitrate media was significantly related to their interfacial activities.

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Section: Introductionmentioning

confidence: 94%

Effect of Interfacial Activity on Silver Extraction Rate with Calix[4]arene Derivatives in Nitrate Media

Kim¹,

Morisada²,

Kawakita³

et al. 2014

J.I.E.

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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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“…Recovery of Ag from nitrate solution is mainly studied at low acid concentrations, typically above a pH of 1, while that at high acid concentration solutions is limit. [13][14][15][16][17][18][19] 5, 8-diethyl-7-hydroxy-dodecan-6-oxime (LIX63) has been used in research and industrial settings to extract many metals, including cobalt, nickel, palladium, gallium, and molybdenum. [20][21][22][23] In our previous study, 24) LIX63 was used to selectively extraction of silver from the nitrate leaching solution of spent Ag/α-Al 2 O 3 catalyst, which contains Ag 7.08, Al 0.07, Si 0.04, Ca 0.007, and Re 0.016 g/dm 3 .…”

Section: Introductionmentioning

confidence: 99%

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al<sub>2</sub>O<sub>3</sub> Catalyst by Solvent Extraction and Reduction

2017

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Nitric acid was employed to strip silver from loaded 5,8-diethyl-7-hydroxy-dodecan-6-oxime (LIX63) in the recovery of silver from a leaching solution of a spent Ag/α-Al 2 O 3 catalyst. The loaded LIX63 was obtained by contacting the real leaching solution with 0.5 mol/dm 3 LIX63 diluted in kerosene. In order to produce silver powder by reduction, the HNO 3 in the stripping solution was recovered by extraction with tri 2-ethylhexyl amine (TEHA) followed by stripping with distilled water. Silver powder was obtained by reduction with 0.1 mol/dm 3 L-ascorbic acid. A owsheet was proposed to recover Ag from the leaching solution of the spent Ag/α-Al 2 O 3 catalyst by solvent extraction and reduction with minimum waste emissions.

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Selective extraction of silver(I) over palladium(II) with ketonic derivatives of calixarenes from highly concentrated nitric acid

Cited by 91 publications

References 16 publications

Effect of Interfacial Activity on Silver Extraction Rate with Calix[4]arene Derivatives in Nitrate Media

Effect of Interfacial Activity on Silver Extraction Rate with Calix[4]arene Derivatives in Nitrate Media

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

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al<sub>2</sub>O<sub>3</sub> Catalyst by Solvent Extraction and Reduction

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