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Kusaka, Ryoji; Watanabe, Masayuki
Journal of Physical Chemistry Letters (Internet), 13(30), p.7065 - 7071, 2022/08
Times Cited Count：5 Percentile：70.33(Chemistry, Physical)Kusaka, Ryoji; Watanabe, Masayuki
Journal of Physical Chemistry B, 125(24), p.6727 - 6731, 2021/06
Times Cited Count：8 Percentile：44.55(Chemistry, Physical)Kusaka, Ryoji
Hosha Kagaku, (41), p.31 - 33, 2020/03
This commentary article introduced researches involved in encouragement award 2019 of the Japan Society of Nuclear and Radiochemical Sciences. Vibrational sum frequency generation (VSFG) spectroscopy and interfacial studies of solvent extraction of lanthanides and actinides using VSFG spectroscopy were described.
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; Watanabe, Masayuki
no journal, ,
In general solvent extraction, an aqueous phase where metal ions are dissolved and an organic phase where an extractant is dissolved are brought into contact with each other, and the metal is extracted from the aqueous phase to the organic phase as a metal complex. Since the extractant used is poorly soluble in water and surface active, it is considered that complex formation between metal and extractant takes place at the interface and then the metal is extracted into the organic phase. However, due to experimental difficulties, the phase transfer mechanism occurring at the interface is unknown. One of the reasons for the difficulties to observe the metal complex at the interface is that the metal complex moves to the organic phase after the complex formation at the interface. In order to observe the metal complex at the interface, we removed the organic phase so that we can trap the metal complex at the extractant/water interface (the surface of aqueous solution). The structure of the metal complex at the interface is investigated using sum frequency generation (VSFG) spectroscopy to elucidate the solvent extraction mechanism.
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.
