Abstract
The present study investigates the synergistic effect of the anionic surfactant sodium dodecyl sulfate micelles (SDS) on the solvent extraction of copper(II) from saline sulfate medium by some ortho-hydroxy Schiff base extracting agents (HL) in chloroform at (25 ± 2)°C. The Schiff base extractants used are N-salicylideneaniline (HSA), N-(2-hydroxy-1-naphthalidene)aniline (HNA) and N-(2-hydroxy-1-naphthalidene)naphthylamine (HNN). In the absence of SDS, the estimated extraction constants of the three ligands revealed that the extraction efficiency increased in the order HNN < HNA < HSA. The extraction of Cu(II) was remarkably enhanced with HL upon the addition of the SDS surfactant. It was found that SDS did not intervene in the coordination sphere of the Cu(II). The calculated synergistic constant fell in the order HNN > HNA > HSA. A synergistic extraction mechanism of copper(II) with ortho-hydroxy Schiff bases in the presence of the surfactant has been proposed.
Kurzfassung
Diese Studie untersucht den synergistischen Einfluss der Mizellen des anionischen Tensids Natriumdodecylsulfat (SDS) auf die Lösemittelextraktion von Kuper(II) aus Sulfatmedium mittels Ortho-hydroxy-Schiff'sche-Basen (HL) als Extraktionsmittel in Chloroform bei (25 ± 2)°C. Bei den als Extraktionsmittel verwendeten Schiff'schen Basen handelt es sich um N-Salicylidenanilin (HSA), N-(2-Hydroxy-1-naphthaliden)anilin (HNA) und um N-(2-Hydroxy-1-naphthaliden)naphthylamin (HNN). Ohne SDS zeigten die berechneten Extraktionskonstanten der drei Liganden, dass die Extraktionseffizienz in der Reihenfolge HNN < HNA < HAS zunahm. Die Extraktion von Kupfer(II)-ionen wurde deutlich von HL unter Zugabe von SDS erhöht. Es wurde gezeigt, dass SDS nicht in die Koordinationssphäre des Cu(II)-ion eintritt. Die berechneten synergistischen Konstanten fallen in der Folge HNN > HNA > HSA. Ein synergistischer Extraktionsmechanismus von Kupfer(II) mit Ortho-hydroxy-Schiff'schen-Basen in Gegenwart von Tensid wird vorgeschlagen.
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