Journal of Radioanalytical and Nuclear Chemistry
Volume/Issue:
Volume 283: Issue 3

Comparative extraction efficiencies of tri-n-butyl phosphate and N,N-dihexyloctanamide for uranium recovery using supercritical CO2

Authors:
A. Kanekar Bhabha Atomic Research Centre Radiochemistry Division Trombay Mumbai 400085 India

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P. Pathak Bhabha Atomic Research Centre Radiochemistry Division Trombay Mumbai 400085 India

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P. Mohapatra Bhabha Atomic Research Centre Radiochemistry Division Trombay Mumbai 400085 India

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V. Manchanda Bhabha Atomic Research Centre Radiochemistry Division Trombay Mumbai 400085 India

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Pages:
789–796
Online Publication Date:
29 Dec 2009
Publication Date:
01 Mar 2010
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10967-009-0423-x
Keywords:
Supercritical fluid extraction; Uranium; Soil; TBP; DHOA; H2O2
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Abstract  

Extraction of uranium from tissue paper, synthetic soil, and from its oxides (UO2, UO3 and U3O8) was carried out using supercritical carbon dioxide modified with methanol solutions of extractants such as tri-n-butyl phosphate (TBP) or N,N-dihexyl octanamide (DHOA). The effects of temperature, pressure, extractant/nitric acid (nitrate) concentration, and of hydrogen peroxide on uranium extraction were investigated. The dissolution and extraction of uranium in supercritical CO2 modified with TBP, from oxide samples followed the order: UO3 ≫ UO2 > U3O8. Addition of hydrogen peroxide in the modifier solution enhanced the dissolution/extraction of uranium in dynamic mode. DHOA appeared better than TBP for recovery of uranium from different oxide samples. Similar enhancement in uranium extraction was observed in static mode experiments in the presence of hydrogen peroxide. Uranium estimation in the extracted fraction was carried out by spectrophotometry employing 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) as the chromophore.

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Cover Journal of Radioanalytical and Nuclear Chemistry
Journal of Radioanalytical and Nuclear Chemistry
Print ISSN:
0236-5731
Online ISSN:
1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation		 1968
Volumes
per Year		 1
Issues
per Year		 12
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)

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