Extraction of metals under Galvani potential control

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Extraction of metals under Galvani potential control. / Nieminen, Eemi; Nikkilä, Henrik; Aikio, Ella; Murtomäki, Lasse.

In: Current Topics in Electrochemistry, Vol. 19, 11.12.2017, p. 67-80.

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@article{8db0e803b77a4b36950db84648f2717a,
title = "Extraction of metals under Galvani potential control",
abstract = "Galvani potential established by a common ion at an interface between two immiscible electrolyte solutions (ITIES) can serve as a driving force and catalyse various biphasic reactions. Using potential determining ions provides a means to scale-up electrochemical processes at the ITIES from the laboratory, analytical scale – at least – to the preparative scale without relying on electrodes and an external power source. However, research on the applications of this phenomenon has been rather scarce. In this work, the effect of Galvani potential on the extraction of various metals with diphenylthiocarbazone (Dithizone) dissolved in 1,2-dichlorobenzene (DCB) was investigated using conventional 4-electrode cell cyclic voltammetry (CV) and extraction experiments in which the Galvani potential at the ITIES was controlled by a common ion. Especially, in the case of metals that do not spontaneously form a complex with the ligand, extraction was not detectable in the CV within the potential window provided by the supporting electrolytes. However, the extraction experiments show that the Galvani potential does enhance the extraction rate of these metals significantly, which indicates that the established potential exceeds the potential window of the CVs. Some of the metals were found to have affinity to the potential determining ions, and negative effect of additional electrolytes in the water phase on the extracted fraction was observed, which will have to be taken into account if potential determining ions were applied in extraction.",
keywords = "liquid-liquid interface, Galvani potential, metal extraction",
author = "Eemi Nieminen and Henrik Nikkil{\"a} and Ella Aikio and Lasse Murtom{\"a}ki",
note = "Lehden verkkosivu: http://www.researchtrends.net/tia/title.asp?id=19 http://www.researchtrends.net/tia/article_pdf.asp?in=0&vn=19&tid=19&aid=6039",
year = "2017",
month = "12",
day = "11",
language = "English",
volume = "19",
pages = "67--80",
journal = "Current Topics in Electrochemistry",
issn = "0972-4443",

}

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TY - JOUR

T1 - Extraction of metals under Galvani potential control

AU - Nieminen, Eemi

AU - Nikkilä, Henrik

AU - Aikio, Ella

AU - Murtomäki, Lasse

N1 - Lehden verkkosivu: http://www.researchtrends.net/tia/title.asp?id=19 http://www.researchtrends.net/tia/article_pdf.asp?in=0&vn=19&tid=19&aid=6039

PY - 2017/12/11

Y1 - 2017/12/11

N2 - Galvani potential established by a common ion at an interface between two immiscible electrolyte solutions (ITIES) can serve as a driving force and catalyse various biphasic reactions. Using potential determining ions provides a means to scale-up electrochemical processes at the ITIES from the laboratory, analytical scale – at least – to the preparative scale without relying on electrodes and an external power source. However, research on the applications of this phenomenon has been rather scarce. In this work, the effect of Galvani potential on the extraction of various metals with diphenylthiocarbazone (Dithizone) dissolved in 1,2-dichlorobenzene (DCB) was investigated using conventional 4-electrode cell cyclic voltammetry (CV) and extraction experiments in which the Galvani potential at the ITIES was controlled by a common ion. Especially, in the case of metals that do not spontaneously form a complex with the ligand, extraction was not detectable in the CV within the potential window provided by the supporting electrolytes. However, the extraction experiments show that the Galvani potential does enhance the extraction rate of these metals significantly, which indicates that the established potential exceeds the potential window of the CVs. Some of the metals were found to have affinity to the potential determining ions, and negative effect of additional electrolytes in the water phase on the extracted fraction was observed, which will have to be taken into account if potential determining ions were applied in extraction.

AB - Galvani potential established by a common ion at an interface between two immiscible electrolyte solutions (ITIES) can serve as a driving force and catalyse various biphasic reactions. Using potential determining ions provides a means to scale-up electrochemical processes at the ITIES from the laboratory, analytical scale – at least – to the preparative scale without relying on electrodes and an external power source. However, research on the applications of this phenomenon has been rather scarce. In this work, the effect of Galvani potential on the extraction of various metals with diphenylthiocarbazone (Dithizone) dissolved in 1,2-dichlorobenzene (DCB) was investigated using conventional 4-electrode cell cyclic voltammetry (CV) and extraction experiments in which the Galvani potential at the ITIES was controlled by a common ion. Especially, in the case of metals that do not spontaneously form a complex with the ligand, extraction was not detectable in the CV within the potential window provided by the supporting electrolytes. However, the extraction experiments show that the Galvani potential does enhance the extraction rate of these metals significantly, which indicates that the established potential exceeds the potential window of the CVs. Some of the metals were found to have affinity to the potential determining ions, and negative effect of additional electrolytes in the water phase on the extracted fraction was observed, which will have to be taken into account if potential determining ions were applied in extraction.

KW - liquid-liquid interface

KW - Galvani potential

KW - metal extraction

M3 - Article

VL - 19

SP - 67

EP - 80

JO - Current Topics in Electrochemistry

JF - Current Topics in Electrochemistry

SN - 0972-4443

ER -

ID: 16394932