Equilibrium and rate of iron(III) extraction from chloride solutions by individual hydrophobic extractants and their mixtures

Abstract

The main goal of this work was to study and compare the rate of iron(III) extraction from chloride solutions by commercial extractants: Alamine 336, TOPO and LIX 54 and their mixtures. Using the interfacial tension data, obtained for mixed systems, the values of surface mole fraction and molecular interaction parameter of extractants were estimated. Determination of the extraction rates was performed by using the Lewis-type stirred transfer cell. It was found that the extraction efficiency of extractants are changed in the following order: Alamine 336>TOPO>β-diketone. The addition of a chelating extractant to the system decreases the extraction efficiency, for example the addition of β-diketone to TOPO decreases the extraction efficiency by about 50%.

Application of Polymer-Embedded Tetrabutylammonium Bromide (TBAB) Membranes for the Selective Extraction of Metal Ions from Aqueous Solutions

“…It appears that only a high concentration of HCl enables effective Fe(III) transport. It is worth noting that at high concentrations of chloride ions and HCl acid, Fe(III)occurs in the form of anion complexes of the FeCl 4 type [ 30 , 31 , 32 ] and this phenomenon probably enables the selective removal of Fe(III) by PIM with TBAB from concentrated HCl. At low concentrations of HCl, Fe(III) exists as FeCl 3 and as cationic chlorocomplexes such as FeCl 2 + , FeCl 2+ , and Fe 3+ .…”

Mutual Separation of Fe(II) and Fe(III) Using Cyclohexane/Water/ Ionic-liquid Triphasic Extraction System with 2,2′-Bipyridine and Tri-n-octylphosphine Oxide

“…Moreover, tri-n-octylphosphine oxide (TOPO, Fig. 1) [46][47][48][49] was selected as an extractant for Fe(III) due to its high affinity with aliphatic cyclohexane. Hard Lewis base TOPO with an O donor atom can act as an effective ligand for hard Lewis acid Fe(III).…”

Solvent Extraction of Iron(III) with Tri Methyl Amine from Mineral Acid Solutions

“…Because of the different biological roles of iron in humans, animals, plants, and oceans, the need for analysis of iron in environmental and biomedical materials have been increased considerable attention. Solvent extraction of Iron(III) from aqueous hydrochloric [2][3][4] and sulphuric 5 and mineral acid 6,7 solutions by various amines has been studied.…”