TY - JOUR
T1 - Effect of sodium ions on the extraction of rare earth metals by liquid surfactant membranes containing a calix[4]arene carboxyl derivative
AU - Kakoi, Takahiko
AU - Oshima, Tatsuya
AU - Nishiyori, Takayuki
AU - Kubota, Fukiko
AU - Goto, Masahiro
AU - Shinkai, Seiji
AU - Nakashio, Fumiyuki
N1 - Funding Information:
This work was partly supported by the Arai Science and Technology Foundation. The authors are grateful to Mr. Ohto in Saga University for the valuable discussion concerning extraction of rare earth metals with calixarene derivatives.
PY - 1998/5/27
Y1 - 1998/5/27
N2 - A novel host compound calixarene has been applied as a mobile carrier for the separation and concentration of rare earth metals by liquid surfactant membranes (LSMs). Using the novel carrier, extraction of rare earth metals (He, Er and Y) by LSMs was systematically studied in a stirred cell. Extraction behavior of rare earth metals by the carboxyl derivative of calix[4]arene was found to be extremely sensitive to coexisting sodium ions in the feed solution. The extractability of rare earth metals was remarkably enhanced by the addition of sodium ions. The permeation rate of rare earth metals through the LSMs in the presence of sodium ions was 100-fold higher than that without sodium ions. This enhancement of the permeation rate is attributed to the preferential conformation change in the host compound of calixarene initiated by sodium ions. The permeation mechanism of rare earth metals by LSMs is elucidated by an interfacial reaction model.
AB - A novel host compound calixarene has been applied as a mobile carrier for the separation and concentration of rare earth metals by liquid surfactant membranes (LSMs). Using the novel carrier, extraction of rare earth metals (He, Er and Y) by LSMs was systematically studied in a stirred cell. Extraction behavior of rare earth metals by the carboxyl derivative of calix[4]arene was found to be extremely sensitive to coexisting sodium ions in the feed solution. The extractability of rare earth metals was remarkably enhanced by the addition of sodium ions. The permeation rate of rare earth metals through the LSMs in the presence of sodium ions was 100-fold higher than that without sodium ions. This enhancement of the permeation rate is attributed to the preferential conformation change in the host compound of calixarene initiated by sodium ions. The permeation mechanism of rare earth metals by LSMs is elucidated by an interfacial reaction model.
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U2 - 10.1016/S0376-7388(97)00341-4
DO - 10.1016/S0376-7388(97)00341-4
M3 - Article
AN - SCOPUS:0032572022
SN - 0376-7388
VL - 143
SP - 125
EP - 135
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1-2
ER -