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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.
Ouchi, Kazuki; Otobe, Haruyoshi; Kitatsuji, Yoshihiro
no journal, ,
We analyzed electrodeposited U(IV) compounds on the electrode surface with electrochemical impedance spectroscopy. Impedance spectra of U deposits on the electrode surface were observed Nyquist plot semicircles, and these semicircles grew with the increase of deposition amount. This indicates that these semicircles are originated from U deposits. The obtained electrical resistances of U deposits were increased with time. This phenomenon indicates that electrodeposits of U deposits had been transfered into oxide with high electrical resistance.
O / EtOH SolutionSaeki, Morihisa*; Matsumura, Daiju; Yomogida, Takumi; Taguchi, Tomitsugu*; Tsuji, Takuya; Saito, Hiroyuki*; Nakanishi, Ryuzo*; Oba, Hironori*
no journal, ,
When nanosecond pulsed UV laser is irradiated into a HO / EtOH solution of platinum group metal (PGM) ions, PGM particles with sub-micron size are formed. We investigated laser induced particle formation of Pd
in the HO / EtOH solution by in situ time-resolved XAFS spectroscopy and showed dependence of the reaction rate of laser-induced particle formation on the laser fluence. The dependence on the laser fluence elucidated that the photons contribute not only to the reduction of the Pd, but also to the autocatalytic growth of the Pd particles.