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Updated: Feb 2, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
Published on: August 13, 2019
Mechanism of phase transfer of uranyl ions: a vibrational sum frequency generation spectroscopy study on solvent
Ryoji Kusaka1, Masayuki Watanabe
1Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan. kusaka.ryoji@jaea.go.jp.
Abstract:
Mechanistic understanding of solvent extraction of uranyl ions (UO22+) 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, UO2(NO3)2, passes through the interface and forms the uranyl-TBP complex, UO2(NO3)2(TBP)2, in the organic phase.
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