Abstract
A new Schiff base extractant, o-(1-{(E)-[1-(o-hydroxyphenyl)ethylidene]hydrazono}ethyl)phenol (HPEHEP), was synthesized to separate and preconcentrate U(VI) ions from sulfate solution. Various instrumental techniques such as elemental analysis, FTIR, and 1H NMR were employed for full characterization of the synthetic extractant. Analysis of the traditional log D-log [extractant concentration] and log D-pH dependences shows that the uranium ions were extracted as a complex with the ligand: metal ratio of 2: 1, containing one ionizable hydrogen ion. The uranium extraction and stripping conditions have been experimentally optimized. From the extractant effects, 1.86 × 10−2 M HPEHEP was found to be suitable for the U separation. The thermodynamic study indicates that the extraction of uranium(VI) from sulfate medium is an exothermic process (ΔH = −9.87 kJ mol−1). The construction of extraction and stripping isotherms shows that three theoretical stages will be sufficient for countercurrent treatment. The tolerance limits for several metal ions with the synthesized Schiff base extractant were calculated and gave high tolerance limit. The optimum parameters of solvent extraction were finally applied to sulfate leach liquor.
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Ismaiel, D.A. Extraction of Uranium(VI) Ions from Sulfate Medium Using Synthesized o-(1-{(E)-[1-(o-Hydroxyphenyl)ethylidene]-hydrazono}ethyl)phenol. Radiochemistry 62, 37–49 (2020). https://doi.org/10.1134/S1066362220010063
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DOI: https://doi.org/10.1134/S1066362220010063