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Kusaka, Ryoji; Watanabe, Masayuki
Physical Chemistry Chemical Physics, 20(47), p.29588 - 29590, 2018/12
Times Cited Count：18 Percentile：70.02(Chemistry, Physical)Mechanistic understanding of solvent extraction of uranyl ions (UO
) by tributyl phosphate (TBP) will help improve the technology for the treatment and disposal of spent nuclear fuels. So far, it has been believed that uranyl ions in the aqueous phase are adsorbed to a TBP-enriched organic/aqueous interface, form complexes with TBP at the interface, and are extracted into the organic phase. Here we show that uranyl-TBP complex formation does not take place at the interface using vibrational sum frequency generation (VSFG) spectroscopy and propose an alternative extraction mechanism that uranyl nitrate, UO(NO
), passes through the interface and forms the uranyl-TBP complex, UO(NO)(TBP), in the organic phase.
Kusaka, Ryoji; Schnaars, K.; Watanabe, Masayuki
no journal, ,
To unveil the extraction mechanism of metal elements from the aqueous phase to the organic phase, we have recently suggested that it is useful to clarify the structure and the property of the metal complexes formed on the surface of aqueous solutions dissolving metal ion and extractant (ligand). In the present study, in order to reveal the mechanism of the solvent extraction of lanthanides by di-(2-ethylhexyl)phosphoric acid (HDEHP), we measured vibrational spectra of lanthanides-HDEHP complexes on the aqueous solutions in the P=O stretch region with vibrational sum frequency generation (VSFG) spectroscopy, and investigated the structure and properties of the complexes on the surface of the aqueous solutions.
Kusaka, Ryoji; Watanabe, Masayuki
no journal, ,
We study extraction mechanism of metal elements from the aqueous phase to the organic phase to improve separation technology by solvent extraction. In the present presentation, we comprehensively show recent results about transfer mechanism of metal elements, studied by Vibrational Sum Frequency Generation (VSFG) spectroscopy. Based on the results, we propose a novel way for improvement of solvent extraction technology.
Kusaka, Ryoji
no journal, ,
This presentation is the award-winning lecture of the Japan Society of Nuclear and Radiochemical Sciences 2019 Encouragement Award. It will be presented that the research achievements on the interface chemistry of lanthanide and actinide, which have been obtained by using vibrational sum frequency generation spectroscopy in the 4th research building of JAEA.
