TY - JOUR
T1 - Pertraction of americium(III) through supported liquid membranes containing benzene-centered tripodal diglycolamides (Bz-T-DGA) as an extractant/carrier
AU - Mahanty, Bholanath
AU - Mohapatra, Prasanta K.
AU - Leoncini, Andrea
AU - Huskens, Jurriaan
AU - Verboom, Willem
PY - 2019/1
Y1 - 2019/1
N2 - Two novel benzene-centered tripodal diglycolamide (Bz-T-DGA) ligands with affinity for actinide ions were employed for the solvent extraction as well as flat sheet supported liquid membrane (SLM) transport of trivalent americium (Am3+), considered as one of the most important minor actinide ions in the high level waste (HLW). Bz-T-DGA ligands with isopentyl substituents and varying spacer lengths in the DGA arms, viz. methylene (TPAMTEB) and ethylene (TPAETEB) groups were employed for actinide extraction for possible application in nuclear waste remediation. With both the ligands, the extraction of Am3+ increased with the concentration of nitric acid (1–6 M HNO3), the distribution ratio (D) values being 16.6 and 3.71 at 3 M HNO3 and 35.1 and 44.4 at 6 M HNO3 for 6.6 × 10−4 M TPAMTEB and TPAETEB, respectively taken in a 5% isodecanol and 95% n-dodecane diluent mixture. A stripping study showed a relatively slow stripping of Am3+ from the loaded membrane with TPAETEB even in the presence of a complexing agent. Am3+ transport rates were rather slow in polypropylene (PP) flat sheets as compared to previous, analogous studies suggesting slow migration of the complexed ions. Am3+ transport was 4.8 times slower in TPAETEB than in TPAMTEB with diffusion coefficients of 4.5 × 10−8 and 2.16 × 10−7 cm2/s, respectively.
AB - Two novel benzene-centered tripodal diglycolamide (Bz-T-DGA) ligands with affinity for actinide ions were employed for the solvent extraction as well as flat sheet supported liquid membrane (SLM) transport of trivalent americium (Am3+), considered as one of the most important minor actinide ions in the high level waste (HLW). Bz-T-DGA ligands with isopentyl substituents and varying spacer lengths in the DGA arms, viz. methylene (TPAMTEB) and ethylene (TPAETEB) groups were employed for actinide extraction for possible application in nuclear waste remediation. With both the ligands, the extraction of Am3+ increased with the concentration of nitric acid (1–6 M HNO3), the distribution ratio (D) values being 16.6 and 3.71 at 3 M HNO3 and 35.1 and 44.4 at 6 M HNO3 for 6.6 × 10−4 M TPAMTEB and TPAETEB, respectively taken in a 5% isodecanol and 95% n-dodecane diluent mixture. A stripping study showed a relatively slow stripping of Am3+ from the loaded membrane with TPAETEB even in the presence of a complexing agent. Am3+ transport rates were rather slow in polypropylene (PP) flat sheets as compared to previous, analogous studies suggesting slow migration of the complexed ions. Am3+ transport was 4.8 times slower in TPAETEB than in TPAMTEB with diffusion coefficients of 4.5 × 10−8 and 2.16 × 10−7 cm2/s, respectively.
KW - Americium
KW - Plutonium
KW - Solvent extraction
KW - Supported liquid membrane
KW - Tripodal diglycolamides
KW - 22/4 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85056197166&partnerID=8YFLogxK
U2 - 10.1016/j.cherd.2018.10.023
DO - 10.1016/j.cherd.2018.10.023
M3 - Article
AN - SCOPUS:85056197166
SN - 0263-8762
VL - 141
SP - 84
EP - 92
JO - Chemical Engineering Research and Design
JF - Chemical Engineering Research and Design
ER -