title: A Kinetic Study of Copper Ion Extraction by Kelex 100 at a Heptane-Water Interface
abstract: A study of the kinetics of Cu2+ extraction by 7-(4-ethyl-1-methyloctyl)8-hydroxyquinoline (Kelex 100) has been undertaken in a static transfer cell, where the total concentration of the Cu2+-Kelex 100 complex in the organic phase is monitored in situ as the reaction proceeds using attenuated total internal reflectance spectroscopy. The temporal characteristics of the extraction of Cu2+ from water into heptane could be accounted for using a simple one-dimensional diffusion model coupled with a reaction-limited interaction between Cu2+ and Kelex 100. Rate constants for the reaction of Kelex 100 and Cu2+ at a model interface were obtained from stopped flow experiments using a neutral micelle (C12E8) system. These rate constants were used to model the reaction between Cu2+ and Kelex 100 at the heptane-water interface.
authors.affiliation: Advanced Minerals Products Research Centre, University of Melbourne, Parkville, Victoria, 3052, Australia
authors.initials: JK
authors.lastname: Mcculloch
authors.initials: JM
authors.lastname: Perera
authors.initials: ED
authors.lastname: Kelly
authors.initials: LR
authors.lastname: White
authors.initials: GW
authors.lastname: Stevens
authors.initials: F
authors.lastname: Grieser