TY - JOUR
T1 - Liquid–Liquid Extraction of Actinides from Nitric Acid Feeds Using Two Hexa-n-alkylnitrilotriacetamides
AU - Karak, Ananda
AU - Mahanty, Bholanath
AU - Mohapatra, Prasanta K.
AU - Egberink, Richard J.M.
AU - Valsala, T. P.
AU - Sathe, D. B.
AU - Bhatt, R. B.
AU - Huskens, Jurriaan
AU - Verboom, Willem
N1 - Publisher Copyright:
© 2021 Taylor & Francis Group, LLC.
PY - 2022/6/7
Y1 - 2022/6/7
N2 - Solutions of two nitrilotriacetamide (NTA) ligands, viz., N,N,N’,N’,N”,N”-hexa-n-butylnitrilotriacetamide (HBNTA) and N,N,N’,N’,N”,N”-hexa-n-hexylnitrilotriacetamide (HHNTA) in 20% isodecanol–80% n-dodecane were employed for the extraction of U(VI), Np(IV), Pu(IV), and Am(III) from nitric acid feed solutions. Limitations of ligand solubility and third-phase formation when contacted with nitric acid solutions led to the choice of the diluent composition of 20% isodecanol and 80% n-dodecane. The results of the solvent extraction studies indicated poor extraction of the metal ions with HBNTA as compared to that with HHNTA as the extractant and hence, major part of this work involved HHNTA. Slope analysis suggested extraction of 1:1 (ML) species with Np(IV) and Pu(IV) at 3 M HNO3 and mixed 1:2 (ML2) and 1:3 (ML3) species with U(VI) at pH 2. At 0.5 M HNO3, the observed trend for extraction was Pu(IV) > Np(IV) >> Am(III) > U(VI).
AB - Solutions of two nitrilotriacetamide (NTA) ligands, viz., N,N,N’,N’,N”,N”-hexa-n-butylnitrilotriacetamide (HBNTA) and N,N,N’,N’,N”,N”-hexa-n-hexylnitrilotriacetamide (HHNTA) in 20% isodecanol–80% n-dodecane were employed for the extraction of U(VI), Np(IV), Pu(IV), and Am(III) from nitric acid feed solutions. Limitations of ligand solubility and third-phase formation when contacted with nitric acid solutions led to the choice of the diluent composition of 20% isodecanol and 80% n-dodecane. The results of the solvent extraction studies indicated poor extraction of the metal ions with HBNTA as compared to that with HHNTA as the extractant and hence, major part of this work involved HHNTA. Slope analysis suggested extraction of 1:1 (ML) species with Np(IV) and Pu(IV) at 3 M HNO3 and mixed 1:2 (ML2) and 1:3 (ML3) species with U(VI) at pH 2. At 0.5 M HNO3, the observed trend for extraction was Pu(IV) > Np(IV) >> Am(III) > U(VI).
KW - Actinides
KW - Nitrilotriacetamide
KW - Separation
KW - Solvent extraction
KW - UT-Hybrid-D
KW - 22/2 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85100750314&partnerID=8YFLogxK
U2 - 10.1080/07366299.2021.1946999
DO - 10.1080/07366299.2021.1946999
M3 - Article
AN - SCOPUS:85100750314
SN - 0736-6299
VL - 40
SP - 366
EP - 386
JO - Solvent extraction and ion exchange
JF - Solvent extraction and ion exchange
IS - 4
ER -