Pertraction of Np(IV) and Pu(IV) across a flat sheet supported liquid membrane containing two N-pivoted tripodal diglycolamides

Liquid–Liquid Extraction of Actinides from Nitric Acid Feeds Using Two Hexa-n-alkylnitrilotriacetamides

“…The hexaalkyl nitrilotriacetamide ligands, HBNTA and HHNTA, were studied for the extraction of U(VI), Np(IV), Pu(IV), and Am(III) from nitric acid feed solutions in the diluent mixture 20% isodecanol-80% n-dodecane (due to solubility reasons and to avoid third-phase formation). HHNTA 1 x 10 -3 M TREN-DGA in 5% isodecanol-95% n-dodecane 3.8 8.7 [38] 1 x 10 -3 M TRPN-DGA in 5% isodecanol-95% n-dodecane 17.9 ± 0.89 134 ± 1.51 [39] 1.0 × 10 -3 M i-Pr 3 -TREN-DGA in 5% isodecanol-95% n-dodecane 147 ± 7.35 315 ± 2.70 [39] 0.1 M HONTA in n-dodecane -~ 12 [21] 0.08 M HHNTA in 20% isodecanol-80% n-dodecane 83. showed better extraction properties than HBNTA, the observed trend being Pu(IV) > Np(IV) ≫ Am(III) > U(VI) at 0.5 M HNO 3 . In case of HHNTA, slope analysis indicated the extraction of 1:1 (ML) species with Np(IV) and Pu(IV) at 3 M HNO 3 and mixed 1:2 (ML 2 ) and 1:3 (ML 3 ) species with U(VI) at pH 2.…”

“…Although, the D M values for Np(IV) and Pu(IV) extraction with TREN-DGA and TRPN-DGA are lower at the concentrations quoted in Table 4, they would be significantly higher if the extractant concentration is extrapolated to 0.08 M, as ML type species are expected to be extracted with this type of ligands. [38,39]…”

Carrier mediated transport of actinides using hexa–n-hexylnitrilotriacetamide (HHNTA)

“…This would definitely form almost quantitative formation of the hexanitrato anionic species, Np(NO 3 ) 6 2− , thereby resulting in poor transport of the metal ion. Such an observation has been made in our recent study on the transport of Np(IV) ions with tripodal diglycolamide ligands [35]. The permeability coefficients were obtained by linear fitting of the ln(C t /C 0 ) vs time plots.…”

Sequestration of Am3+ and Eu3+ into ionic liquid containing Aza-macrocycle based multiple-diglycolamide ligands: Extraction, complexation, luminescence and DFT studies

“…239 Np was prepared as per a procedure reported before. [31] An Eu(NO 3 ) 3 standard solution was prepared by dissolving a known quantity of Eu(NO 3 ) 3 Á5H 2 O (Aldrich; 99.9%) in water (pH $ 2) followed by its volumetric titration with standard EDTA (BDH; AR grade). Eu(Tf 2 N) 3 salt was prepared by reaction of Eu 2 O 3 with HTf 2 N in water as described earlier.…”

“…7 F 4 transition. [31] For the titration experiments, the initial concentration of Eu 3+ in the spectrophotometer cell was ca. 0.35 mmol/L to which a calculated aliquot of the titrant (ligand solution in C 8 mimÁTf 2 N) was added.…”