Characterisation of nickel(II) extraction by 2-hydroxy-5-nonylacetophenone oxime (LIX 84) in a micellar phase

Warren, Dallas B., Dyson, Gail, Grieser, Franz, Perera, Jilska M., Stevens, Geoff W. and Rizzacasa, Mark A. 2003, Characterisation of nickel(II) extraction by 2-hydroxy-5-nonylacetophenone oxime (LIX 84) in a micellar phase, Colloids and surfaces A : physicochemical and engineering aspects, vol. 227, no. 1-3, pp. 49-61, doi: 10.1016/S0927-7757(03)00386-8.

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Title Characterisation of nickel(II) extraction by 2-hydroxy-5-nonylacetophenone oxime (LIX 84) in a micellar phase
Author(s) Warren, Dallas B.
Dyson, Gail
Grieser, Franz
Perera, Jilska M.
Stevens, Geoff W.
Rizzacasa, Mark A.
Journal name Colloids and surfaces A : physicochemical and engineering aspects
Volume number 227
Issue number 1-3
Start page 49
End page 61
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2003-10-23
ISSN 0927-7757
Keyword(s) solvent extraction
micellar phase
electrostatic surface potential
probe location
Summary The properties of the nickel(II)/2-hydroxy-5-nonylacetophenone oxime (HNAPO), an active ingredient in LIX 84, extraction system were characterised in a micellar system. The extinction coefficient, λmax of HNAPO (316 nm) and the Ni2+ complex (387 nm) in a neutral micellar system, poly dispersed octa-ethyleneglycol mono-n-dodecyl ether (G12A8) were determined as 3100 and 3500 M−1 cm−1, respectively. HNAPO was found to have a neutral micellar phase and bulk aqueous phase pKa of 11.5 and 12.5, respectively. The extraction equilibrium constant, Kex, was determined to be 10−8.0, and the deviation from theory observed at high pH can be accounted for by consideration of the competition for nickel(II) ions by hydroxide ions and HNAPO. A micellar phase of octa-ethyleneglycol mono-n-dodecyl ether (C12E8) was determined to be an appropriate model of the free oil/water interface from the solubilised location of HNAPO. Utilising the interfacial probe, 4-heptadecyl-7-hydroxy coumarin (HHC) allowed the determination of the electrostatic surface potential of mixed micelles of G12A8 and sodium dodecyl sulphate (SDS) or dodecyl trimethyl ammonium chloride (DTAC). The electrostatic surface potential was a linear function of the number of additional surfactant monomers within the G12A8 micelle, for the concentration range studied. For G12A8/DTAC mixed micelles, the surface potential was given by +1.1 mV per DTAC molecule per micelle, and for G12A8/SDS mixed micelles the relationship was −1.4 mV per SDS molecule per micelle.
Language eng
DOI 10.1016/S0927-7757(03)00386-8
Field of Research 030199 Analytical Chemistry not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier B.V.
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Document type: Journal Article
Collection: School of Biological and Chemical Sciences
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