A Kinetic Study of Copper Ion Extraction by Kelex 100 at a Heptane–Water Interface

• Published in: Journal of colloid and interface science Vol. 184; no. 2; pp. 406 - 413
• Main Authors: Mcculloch, Jennifer K., Perera, Jilska M., Kelly, Enda D., White, Lee R., Stevens, Geoffrey W., Grieser, Franz
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 25.12.1996; Elsevier
• Subjects: ATR kinetic spectroscopy; Chemistry; diffusion; Exact sciences and technology; Inorganic chemistry and origins of life; Kelex 100; Kinetics and mechanism of reactions; oil/water interface; solvent extraction; solvent extraction; Kelex 100; diffusion; oil/water interface; ATR kinetic spectroscopy; Copper Ions; Kinetics; Liquid liquid extraction; Copper Complexes; Heptane; Hydrometallurgy
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.1996.0635

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.