Interfacial Kinetics in the Extraction of Copper(II) and Nickel(II) with 2′-Hydroxy-5′-nonylbenzophenone Oxime

Abstract

The kinetics of the extractions of copper(II) and nickel(II) with 2′-hydroxy-5′-nonylbenzophenone oxime (HL) in heptane was studied by means of a high-speed stirring apparatus. Linear correlations were established between the initial extraction rate of the metal ions and the amount of HL adsorbed at the liquid-liquid interface. The ratecontrolling step was the reaction between L^- at the interface and the metal ions in aqueous phase adjacent to the interface. A solvent effect of heptane and chloroform on the interfacial mechanism of the extraction of nickel(II) was also examined.