Synergistic Extraction of Nickel by Liquid Surfactant Membranes

Autor:	Katsushi Yamashita, Masahiro Goto, Takahiko Kakoi, Fumiyiki Nakashio, Hiroshi Kosaka
Rok vydání:	1998
Předmět:	Chemistry Process Chemistry and Technology General Chemical Engineering Extraction (chemistry) Inorganic chemistry chemistry.chemical_element Filtration and Separation General Chemistry Mixed ligand Permeation Nickel Membrane Pulmonary surfactant Solvent extraction Stoichiometry
Zdroj:	Separation Science and Technology. 33:369-385
ISSN:	1520-5754 0149-6395
DOI:	10.1080/01496399808544774
Popis:	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 di-oleylphosphoric 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 extractant, 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 extract-ant synergism, the effects of several operation factors in the LSMs were investigated: permeation of Ni(II), pH of external aqueous'phase, and concentrations of extractant and surfactant. The permeation mechanism of Ni(II) in LSMs has been elucidated b...
Databáze:	OpenAIRE
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