Equilibrium Studies on the Synergic Liquid‐Liquid Extraction Process of Copper(II) from Sulphate Media with Mixtures of some Bidentate Mono‐Schiff Bases and Acyclic Polyether Non‐ionic Surfactant in Chloroform

Abstract

The liquid-liquid extraction of copper(II) with bidentate mono-Schiff base extractants(HL), namely, N-salicylideneaniline (SA), N-(2-hydroxy-1-naphthalidene)aniline (HNA), N-salicylidene-1-naphthylamine (SN), and N-(2-hydroxy-1-naphthalidene)-1-naphthylamine (HNN), from a weakly acidic sulphate media into chloroform was studied in both the absence and the presence of acyclic polyether non-ionic surfactant (S). In the absence of the non-ionic surfactant, the extractability of copper(II) was 92.6% with SA, 89% with HNA, 81% with SN, and 80% with HNN. The estimated extraction constants, (log K ex ) of the four extractants revealed that the extraction efficiency increased in the order HNN, SN, HNA,SA. Besides, it was found that copper(II) was extracted as CuL 2 (HL) with SA and HNA, and as CuL 2 with SN and HNN. The extraction of copper(II) was significantly enhanced with HL into chloroform upon the addition of a non-ionic surfactant. An extractability of 100% was reached. The stoichiometry of the extracted complexes was CuL 2 S. The synergic extraction ability of extractants changed in the order SA.HNA.SN,HNN, whereas, the synergic effect fell in the order HNN.SN.HNA,SA.

Experimentally Consistent Ion Association Predicted for Metal Solutions from Free Energy Simulations

“…In chemistry, ion association affects chemical reaction rates, ion-exchange mechanisms, and solvent extraction. The latter is widely used in hydrometallurgical processes of which platinum group metal (PGM) extraction and transport as well as base metal extraction are commercially important examples . In both chemical and biological processes, the metal ions investigated here are generally hydrated , and may associate with hydrated ions with the opposite charge to form ion pairs. , The extent of ion pair formation in electrolyte solutions is generally low, but it occurs more frequently with an increase in salt concentration, with increases in solvent temperature, , and via the use of solvents with low dielectric constants. , …”

Liquid-liquid Extraction of Copper(II) ions from Sulfate Media with Salicylidene Chloroaniline Isomers

“…The stoichiometry coefficients of the extracted species are determined by the slope analysis method. The extraction reaction proceeds by cation exchange mechanism and the extraction constants are evaluated for the different diluents [1][2][3][4][5][6][7][8][9] .…”

Structural Insights into the Coordination and Extraction Mechanism of Nickel(II) with Dinonylnaphthalene Sulfonic Acid and n‐Hexyl 3‐Pyridinecarboxylate Ester as Extractants

“…Solvent extraction is commonly used to separate and recover valuable metals from various liquors and effluents . This technique has attracted practical interest because of its simplicity, energy conservation, and wide applicability . However, the development of a new extractant is a time‐consuming and expensive process.…”