Sorption and separation of metallic ions by a macromolecular resin impregnated with 2-ethylhexyl hydrogen-2-ethylhexylphosphonate

Citation
M. Takahashi et al., Sorption and separation of metallic ions by a macromolecular resin impregnated with 2-ethylhexyl hydrogen-2-ethylhexylphosphonate, NIP KAG KAI, (5), 2000, pp. 341-346
Citations number
12
Language
GIAPPONESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
NIPPON KAGAKU KAISHI
ISSN journal
0369-4577 → ACNP
Issue
5
Year of publication
2000
Pages
341 - 346
Database
ISI
SICI code
0369-4577(200005):5<341:SASOMI>2.0.ZU;2-2
Abstract
Studies have been conducted on the sorption equilibria of Zn(II), Mn(II), C d(II), Cu(II), Co(II) and Sm(III) from aqueous media at low acidities by a macromolecular resin impregnated with 2-ethylhexyl hydrogen-2-ethylhexylpho sphonate (2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester, EHPNA, HR). Sorption equilibria of these metallic ions (Mn+) on the macromolecular res in impregnated with EHPNA (EHPNA-impregnated sorbent) can be expressed by a simple ion exchange reaction which is different from solvent extraction wi th EHPNA. Mn+ + n<(HR)over bar> reversible arrow <(MR)over bar>(n) + nH(+) The equilibrium constants K-ex of Zn(II), Mn(II), Cd(II), Cu(II), Co(II) an d Sm(III) were found to be 6.25 x 10(-3), 4.0 x 10(-5), 4.0 x 10(-5), 3.1 x 10(-5), 2.2 x 10(-6) kg-sor dm(-3) and 7.69 x 10(-3) (kg-sor)(2) dm(-6), r espectively. The separation factors defined by the ratios of the equilibrium constant of Zn(II) / Cu(II), Zn(II) / Mn(II) and Sm(III) / Co(II) were 202, 156 and 34 95, respectively. The mutual separation from the binary metal solutions of Zn(II) / Cu(II), Z n(II) / Mn(II) and Sm (III) / Co(II) using the EHPNA-impregnated sorbent ha s also been studied in a column operation. It was found that the selective separation is attained satisfactorily by use of the sorbent.