Solvent extraction of Zr(IV) and Hf(IV) with N,N,N′,N′-tetraoctyldiglycolamide

Abstract

N,N,N′,N′-tetraoctyldiglycolamide (TODGA) was synthesized and characterized with elemental analysis, infrared spectrometry and nuclear magnetic resonance spectrometry. The synthesized TODGA was applied for the extraction and separation of Zr(IV) and Hf(IV) from nitric acid solutions. The performed studies include the effects of TODGA, nitric acid, nitrate ion, hydrogen ion, and metal ion concentrations as well as time and temperature. TODGA shows effective extraction of Zr(IV) and Hf(IV) from HNO3 ≥ 3 M. However, the maximum separation factor (D Zr/D Hf) obtained using TODGA is 2.8.