Abstract
Kinetic study of the extraction of palladium(I) with didodecylmonothiophosphoric acid in n-heptane diluent was carried out-~using a stirred transfer cell to clarify the extraction mechanism. The effect of surfactants on the kinetics of palladium extraction was also investigated, to elucidate the role of surfactants used in liquid surfactant membranes. Moreover, the interfacial tension between the organic and aqueous phases was measured to elucidate the adsorption equilibrium of the surfactants. It was found that the interfacial activity of each surfactant is higher than that of the extractant. In the kinetic study of palladium extraction, the experimental results of the extraction rate was analyzed by the interfacial reaction model, taking into account of the adsorption of the surfactant and extractant. The rate-determining step of palladium extraction was the complex formation between four chloro-palladium complexes and the extractant at the interface, and the extraction rate constants of each palladium species were obtained. The extraction rate of palladium in n-heptane diluent was much faster than that in toluene. Additionally, it was suggested that there was particular interaction between the surfactant and extractant at the interface. The effect of the surfactant on the extraction rate was explained by taking into account the adsorption of the surfactant at the interface.
| Original language | English |
|---|---|
| Pages (from-to) | 627-643 |
| Number of pages | 17 |
| Journal | Solvent Extraction and Ion Exchange |
| Volume | 11 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - May 1 1993 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Chemical Engineering(all)
Cite this
Extraction mechanism of palladium with didodecylmonothiophosphoric acid in heptane diluent. / Kakoi, Takahiko; Goto, Masahiro; Kondo, Kazuo; Nakashio, Fumiyuki.
In: Solvent Extraction and Ion Exchange, Vol. 11, No. 4, 01.05.1993, p. 627-643.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Extraction mechanism of palladium with didodecylmonothiophosphoric acid in heptane diluent
AU - Kakoi, Takahiko
AU - Goto, Masahiro
AU - Kondo, Kazuo
AU - Nakashio, Fumiyuki
PY - 1993/5/1
Y1 - 1993/5/1
N2 - Kinetic study of the extraction of palladium(I) with didodecylmonothiophosphoric acid in n-heptane diluent was carried out-~using a stirred transfer cell to clarify the extraction mechanism. The effect of surfactants on the kinetics of palladium extraction was also investigated, to elucidate the role of surfactants used in liquid surfactant membranes. Moreover, the interfacial tension between the organic and aqueous phases was measured to elucidate the adsorption equilibrium of the surfactants. It was found that the interfacial activity of each surfactant is higher than that of the extractant. In the kinetic study of palladium extraction, the experimental results of the extraction rate was analyzed by the interfacial reaction model, taking into account of the adsorption of the surfactant and extractant. The rate-determining step of palladium extraction was the complex formation between four chloro-palladium complexes and the extractant at the interface, and the extraction rate constants of each palladium species were obtained. The extraction rate of palladium in n-heptane diluent was much faster than that in toluene. Additionally, it was suggested that there was particular interaction between the surfactant and extractant at the interface. The effect of the surfactant on the extraction rate was explained by taking into account the adsorption of the surfactant at the interface.
AB - Kinetic study of the extraction of palladium(I) with didodecylmonothiophosphoric acid in n-heptane diluent was carried out-~using a stirred transfer cell to clarify the extraction mechanism. The effect of surfactants on the kinetics of palladium extraction was also investigated, to elucidate the role of surfactants used in liquid surfactant membranes. Moreover, the interfacial tension between the organic and aqueous phases was measured to elucidate the adsorption equilibrium of the surfactants. It was found that the interfacial activity of each surfactant is higher than that of the extractant. In the kinetic study of palladium extraction, the experimental results of the extraction rate was analyzed by the interfacial reaction model, taking into account of the adsorption of the surfactant and extractant. The rate-determining step of palladium extraction was the complex formation between four chloro-palladium complexes and the extractant at the interface, and the extraction rate constants of each palladium species were obtained. The extraction rate of palladium in n-heptane diluent was much faster than that in toluene. Additionally, it was suggested that there was particular interaction between the surfactant and extractant at the interface. The effect of the surfactant on the extraction rate was explained by taking into account the adsorption of the surfactant at the interface.
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UR - http://www.scopus.com/inward/citedby.url?scp=0027656908&partnerID=8YFLogxK
U2 - 10.1080/07366299308918178
DO - 10.1080/07366299308918178
M3 - Article
AN - SCOPUS:0027656908
VL - 11
SP - 627
EP - 643
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
SN - 0736-6299
IS - 4
ER -