title: Efficient transport of Am(III) from nitric acid medium using a new conformationally constrained (N,N,N',N'-tetra-2-ethylhexyl)7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamide across a supported liquid membrane.
abstract: Am(III) is one of the most hazardous radionuclide present in nuclear fuel cycle. A new conformationally constrained diamide, (N,N,N',N'-tetra-2-ethylhexyl)7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamide (OBDA) was studied for Am(III) transport from HNO3 medium across a Supported Liquid Membrane. Transport rate was observed to be significantly fast with ∼95% transport of Am(III) within 1h using 0.1M OBDA in the presence of 15% isodecyl alcohol (IDA)/n-dodecane as carrier. The mechanism of transport was investigated by studying various parameters like feed HNO3/NaNO3 concentration, OBDA concentration in the membrane, membrane pore size, membrane thickness etc. From these studies, the mechanism of transport was found to be diffusion controlled with diffusion co-efficient value of 5.1×10(-6)cm(2)/s. The membrane was found to be highly selective for tri- and tetra-valent actinides, and trivalent lanthanides. OBDA based membrane was found to be stable for at least for ten consecutive cycles of operation.
authors.affiliation: Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
authors.forename: S
authors.initials: S
authors.lastname: Sharma
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
authors.forename: S
authors.initials: S
authors.lastname: Panja
authors.affiliation: Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India. Electronic address: ghsunil@barc.gov.in.
authors.forename: S K
authors.initials: SK
authors.lastname: Ghosh
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
authors.forename: P S
authors.initials: PS
authors.lastname: Dhami
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
authors.forename: P M
authors.initials: PM
authors.lastname: Gandhi
keywords: 7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxamide; Americium(III); Facilitated transport; Lanthanide actinide selectivity; Supported Liquid Membrane