TY - JOUR
T1 - Synergistic Extraction of Nickel by Liquid Surfactant Membranes
AU - Yamashita, Katsushi
AU - Kakoi, Takahiko
AU - Kosaka, Hiroshi
AU - Goto, Masahiro
AU - Nakashio, Fumiyuki
N1 - Funding Information:
The authors are grateful to Henkel Hakusui Co. Ltd. (Japan) for the supply of LIX63. This work was partially supported by the Arai Science and Technology Foundation.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1998
Y1 - 1998
N2 - Synergistic extraction of Ni(II) by a mixture of the active component in the commercial extractant LIX63, 5,8-dimethyl-7-hydroxydodecane-6-oxime, and dioleylphosphoric acid (DOLPA) has been investigated by liquid surfactant membranes (LSMs) containing a commercial surfactant, Span 80. Solvent extraction of Ni(II) with the mixture of LIX63 and an ordinary extradant, di(2-ethylhexyl)phosphoric acid (D2EHPA) was carried out. The results show that the LiX63-DOLPA mixture has a high synergistic effect on the extraction of Ni(II) in the LSM system compared with the LIX63-D2EHPA mixture. The synergistic effect of the LIX63-DOLPA mixture is attributed to a mixed ligand complex formation with the stoichiometry of Ni2+/LIX63/DOLPA = 1/2/2. Besides extractant synergism, the effects of several operation factors in the LSMs were investigated: permeation of Ni(II). pH of external aqueous phase, and concentrations of extradant and surfactant. The permeation mechanism of Ni(II) in LSMs has been elucidated by using the interfacial reaction model which takes into account the complex formation at the interface.
AB - Synergistic extraction of Ni(II) by a mixture of the active component in the commercial extractant LIX63, 5,8-dimethyl-7-hydroxydodecane-6-oxime, and dioleylphosphoric acid (DOLPA) has been investigated by liquid surfactant membranes (LSMs) containing a commercial surfactant, Span 80. Solvent extraction of Ni(II) with the mixture of LIX63 and an ordinary extradant, di(2-ethylhexyl)phosphoric acid (D2EHPA) was carried out. The results show that the LiX63-DOLPA mixture has a high synergistic effect on the extraction of Ni(II) in the LSM system compared with the LIX63-D2EHPA mixture. The synergistic effect of the LIX63-DOLPA mixture is attributed to a mixed ligand complex formation with the stoichiometry of Ni2+/LIX63/DOLPA = 1/2/2. Besides extractant synergism, the effects of several operation factors in the LSMs were investigated: permeation of Ni(II). pH of external aqueous phase, and concentrations of extradant and surfactant. The permeation mechanism of Ni(II) in LSMs has been elucidated by using the interfacial reaction model which takes into account the complex formation at the interface.
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U2 - 10.1080/01496399808544774
DO - 10.1080/01496399808544774
M3 - Article
AN - SCOPUS:0032004603
SN - 0149-6395
VL - 33
SP - 369
EP - 385
JO - Separation Science and Technology
JF - Separation Science and Technology
IS - 3
ER -