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

A conformationally constrained diamide, (N,N,N′,N′-tetra-2-ethylhexyl) 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamide (OBDA) was found to transport Am(III) from HNO3 medium across a Supported Liquid Membrane with good transport rate, diffusion coefficient and selectivity over fission products. [Displa...

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Bibliographic Details
Published in:Journal of hazardous materials 2016-03, Vol.305, p.171-177
Main Authors: Sharma, S., Panja, S., Ghosh, S.K., Dhami, P.S., Gandhi, P.M.
Format: Article
Language:English
Subjects:
7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxamide
Americium(III)
Facilitated transport
Lanthanide actinide selectivity
Supported Liquid Membrane
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Summary:A conformationally constrained diamide, (N,N,N′,N′-tetra-2-ethylhexyl) 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamide (OBDA) was found to transport Am(III) from HNO3 medium across a Supported Liquid Membrane with good transport rate, diffusion coefficient and selectivity over fission products. [Display omitted] The highlights of the work are as follows: •Efficient transport of Am(III) in SLM from HNO3 using 0.1M OBDA as carrier.•Very high transport rate (∼95% in 1h) of Am(III).•Higher permeability co-efficient value compared to TEHDGA.•The OBDA loaded SLM can be used for multiple cycles of operation. 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 5.1×10−6cm2/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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2015.11.045