Solvent extraction of plutonium(IV) in monoamide – ammonium ionic liquid mixture (original) (raw)

Separation and Purification Technology, 2016

Abstract

Abstract The extraction behavior of plutonium(IV) was studied in the room temperature ionic liquid, trioctylmethylammonium bis(trifluoromethanesulfonyl)imide ([N 1888 ][NTf 2 ]) containing a monoamide, N,N- dihexyloctanamide (DHOA). The unusual extraction of Pu(IV) observed in this ionic liquid system was reported in this paper. The extraction behavior of plutonium(IV) was investigated as a function of various parameters, such as feed acid concentration, extractant and ionic liquid concentration, type of the extractants, equilibration time and temperature. Changing the extractant from DHOA to tri- n -butyl phosphate reduced the distribution ratio of Pu(IV). The extraction trend of Pu(IV) in neat [N 1888 ][NTf 2 ] was compared with those observed in other ionic liquids such as 1-alkyl-3-methylimidazolium bistriflimide ([C n mim][NTf 2 ]). Pu(IV) extraction in [N 1888 ][NTf 2 ] was found to follow a combination of anion exchange mechanism and neutral solvation pathway at feed acidities above 2 M HNO 3 . The extraction of Pu(IV) in DHOA/[N 1888 ][NTf 2 ] was also compared with those observed in a molecular diluent system, DHOA/ n -DD. All thermodynamic parameters governing the extraction of plutonium(IV) in [N 1888 ][NTf 2 ] was determined and discussed in detail. Stripping of Pu(IV) from the loaded ionic liquid phase was performed using dilute nitric acid.

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