Solvent extraction of Tc(VII) by the mixture of TBP and 2-nitrophenyl octyl ether |
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Authors: | Jing Chen T. Tomasberger |
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Affiliation: | (1) Institute of Nuclear Energy Technology (INET), Tsinghua University, P.O.Box 1021, Beijing, 102201, P.R. China;(2) NRG, P.O. Box 25, 1755 ZG Petten, The Netherlands |
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Abstract: | The extraction of Tc(VII) by the mixture of tri-n-butyl phosphate (TBP) and 2-nitrophenyl octyl ether (NPOE) has been studied. 0.2M NPOE-TBP can extract Tc(VII) effectively from 1M HNO3 and 1M NaOH solutions with distribution ratios of 57.1 and 12.3, respectively. The distribution ratio of Tc(VII) decreases with increasing (>0.5M) HNO3 concentration but increases with the increase of NaOH concentration. A pH 9 NaOH solution has proven to be suitable for Tc(VII) stripping. A simple extraction-stripping cycle can remove Tc(VII) from a sodium hydroxide solution. A more sophisticated extraction process is proposed to remove Tc(VII) from nitric acid solution because the co-extracted HNO3 prevents the direct stripping of Tc(VII) by NaOH solution of pH 9. |
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