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

✍ Scribed by Jennifer K. Mcculloch; Jilska M. Perera; Enda D. Kelly; Lee R. White; Geoffrey W. Stevens; Franz Grieser

• Book ID: 102577493
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 200 KB
• Volume: 184
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.0635

✦ Synopsis

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.