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Separation of cobalt( II ) from manganese( II ) using a polymer inclusion membrane with N ‐[ N , N ‐di(2‐ethylhexyl)aminocarbonylmethyl]glycine ( D2EHAG ) as the extractant/carrier
Author(s) -
Baba Yuzo,
Kubota Fukiko,
Goto Masahiro,
Cattrall Robert W,
Kolev Spas D
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4725
Subject(s) - cellulose triacetate , chemistry , cobalt , aqueous solution , membrane , manganese , sulfuric acid , extraction (chemistry) , plasticizer , metal ions in aqueous solution , polymer , solvent , nuclear chemistry , inorganic chemistry , metal , chromatography , organic chemistry , biochemistry
BACKGROUND The hydrometallurgical separation of Co( II ) from Mn( II ) poses a difficult problem because of their similar chemical and physical properties. A membrane separation method for Co( II ) in the presence of Mn( II ) has been developed which overcomes the potential technological, environmental and health issues associated with solvent extraction. This paper reports on the development of a polymer inclusion membrane ( PIM ) capable of efficiently separating these two metal ions. RESULTS The PIM developed in this study contains 40 wt% N ‐[ N,N ‐di(2‐ethylhexyl)aminocarbonylmethyl] glycine ( D2EHAG ) as the carrier, 30 wt% cellulose triacetate ( CTA ) as the base polymer and 30 wt% dioctylphthalate as a plasticizer. The potential of this membrane for Co( II ) separation and preconcentration has been demonstrated by the complete transfer of Co( II ) from a feed solution containing a similar concentration of Mn( II ) into a sulfuric acid receiving solution with less than 5% Mn( II ) being transported during the same period. CONCLUSIONS The PIM developed as part of this study showed potential for the separation and preconcentration of Co( II ) from its mildly acidic aqueous solutions in the presence of Mn( II ) in applications such as hydrometallurgical processes or recovery of Co( II ) from lithium ion batteries. © 2015 Society of Chemical Industry