New family of Type V eutectic solvents based on 1,10-phenanthroline and their application in metal extraction

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Crema, APS (Author) Other; Schaeffer, N (Author) Other; Bastos, H (Author) Other; Silva, LP (Author) Other; Abranches, DO (Author) Other; Passos, H (Author) FEUP; Hespanhol, MC (Author) Other; Coutinho, JAP (Author) Other

Journal

Title: Hydrometallurgy

Vol. 215

ISSN: 0304-386X

Publisher: Elsevier

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Other information

Authenticus ID: P-00X-CYX

DOI: 10.1016/j.hydromet.2022.105971

Abstract (EN): Although a theoretically extensive number of hydrophobic eutectic mixtures suitable for solvent extraction are obtainable, to date reported mixtures rely on a limited number of chelating groups, namely phosphine oxide, carboxylic acid, and ketones. Herein, a new family of Type V Deep Eutectic Solvents (DES) based on the poly-pyridyl ligand 1,10-phenanthroline (phen) is presented with the aim of facilitating the extrapolation of the disclosed findings to other potential systems based on phen or bipyridine derivatives. The hydrophobic eutectic solvent composed of the natural phenolic extract thymol with phen exhibits a solid-liquid phase diagram with a useable liquidus compositional range on the thymol-rich side. The physical properties of the mixture are dependent on the presence of solutes liable to change the nature of the existing hydrogen-bonded network, most notably through the protonation of phen. The metal chelating ability of phen are retained when included as a DES component. Quantitative extraction of various transition metals cations (Cd(II), Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)) as well as the platinum group metal Pd(II) was obtained across a range of solvent compositions. The extraction of Li(I), Mn(II), Co(II) and Ni(II) was further studied as a function of the aqueous phase pH, with the extent of metal partition decreasing with the protonation of phen at pH values below 1.0. Building upon the luminescent properties of phen, the eutectic solvent was further applied as a simultaneous pre-concentration and quantification medium for Fe(II/III), allowing for the facile UV-vis detection of Fe up to 12 mu g L-1.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12