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Dioxouranium(VI) extraction in microchannels using ionic liquids
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DOI：10.1016/j.cej.2012.08.064.png)
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The extraction of uranium(VI) from aqueous nitric acid solutions by tributylphosphate {TBP; 30%(v/v)} dissolved in the ionic liquid 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide was investigated. The experiments were performed in a Teflon microchannel of 0.5 mm internal diameter, while the dioxouranium(VI) concentrations in the aqueous and the ionic liquid phases were determined by UV-Vis spectroscopy. The effects of initial nitric acid concentration (0.01-3 M), residence time, and phase flow rate ratio were studied. It was found that, with increasing nitric acid concentration, the percentage of dioxouranium(VI) extracted decreased and then increased again, while the extraction efficiency followed a slightly different trend. Overall mass transfer coefficients varied between 0.049 s(-1) and 0.312 s(-1). (C) 2012 Elsevier B.V. All rights reserved.
Keyword:
Liquid-liquid extraction
Ionic liquids
Microchannel
Dioxouranium(VI) nitrate
UV-Vis spectroscopy
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13.2
论文数:
7.6W
被引数:
48.5W
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