Extraction of Eu(III) in diglycolamide-organophosphorous acid and the interaction of binary solution with Eu(III) studied by FTIR spectroscopy

Add time:08/16/2019    Source:sciencedirect.com

Extraction behavior of Eu(III) from nitric acid medium was studied in a binary solution of tetra bis(2-ethylhexyl)diglycolamide (TEHDGA) and an acidic extractant (HA) present in n-dodecane (n-DD). The acidic extractants chosen were bis(2-ethylhexyl)phosphoric acid (HDEHP), bis(2-ethylhexyl)phosphonic acid (PC88A) and bis(2,4,4-trimethylpentyl)phosphinic acid (CYANEX-272) whose pKa values were 3.24, 4.51 and 6.37 respectively. The interaction of Eu(III) with TEHDGA and HA at various acidities was studied by Attenuated Total Reflectance (ATR)-Fourier Transform Infrared (FTIR) spectroscopy. The changes in the amidic CO and etheric CO stretching bands of TEHDGA and phosphoryl PO stretching bands of HA occurred upon Eu(III) extraction at various acidities were monitored, and correlated the peak shifts observed in the ATR-FTIR spectrum to the distribution ratio of Eu(III) in the binary solution and pKa value of the acidic extractant.

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