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Shimomura, Ryotaro*; Suzuki, Tomoya*; Motokawa, Ryuhei; Ueda, Yuki; Shiwaku, Hideaki; Koyama, Kazuya*; Narita, Hirokazu*
no journal, ,
no abstracts in English
Sasaki, Yuji
no journal, ,
Since initially reported TODGA extractant at 2001, I have developed four analogous extractants, which have O, S, and N donor at ether position. The distribution ratios of over 70 metals using these extractants were obtained in order to know the all-inclusive extractability. Concerning with this, I developed water-soluble reagents with the same central frame but with short alkyl chains and examined their masking effects.
Sasaki, Yuji; Kaneko, Masashi; Ban, Yasutoshi; Matsumiya, Masahiko*; Nakase, Masahiko*; Takeshita, Kenji*
no journal, ,
In our group, the separation of An from Ln is performed using batch-wise multi stage extraction. The condition, DGA(diglycolamide)-DTPA(diethylenetriamine-pentaacetic acid) or DGA-DTBA(diethylenetriamine-triacetic diamide),showed approximate 10 of D(Am)/D(Ln). The multi stage extraction of 10 
10 of organic and aqueous phase numbers gives successfully 97% of Am with 3% of Ln in the aqueous phase.
Nomizu, Daiki; Sasaki, Yuji; Kaneko, Masashi; Matsumiya, Masahiko*; Katsuta, Shoichi*
no journal, ,
In our group, the mutual separation of lanthanides by solvent extraction method is conducted. We focus on two phases in solvent extraction, the hydrophilic and lipophilic reagents are employed in both phases. Namely, using the condition of TODGA in organic phase and DOODA(C2, dioxaoctane-diamide) in aqueous phase or DOODA(C8) in organic phase and TEDGA in aqueous phase, the distribution ratios of Ln are compared. Using these results, the batch-wise multi stage extractions are performed in order to separate light and heavy Ln.
Okamura, Hiroyuki; Kozai, Naofumi
no journal, ,
Technetium-99 is a long-lived anionic radionuclide and is also contained in radioactively contaminated water generated from the Fukushima Daiichi Nuclear Power Plant. However, there are few studies on the development of anion treatment technique compared to that of cation treatment technique. Therefore, it is desired to develop a novel technique capable of separating anionic radionuclides including technetium from an aqueous solution such as radioactively contaminated water with high efficiency. In this study, we focused on a protic ionic liquid ([TOAH][Cl]) consisting of a proton adduct of trioctylamine (TOA) and a chloride ion. The extraction system for perrhenate ion (ReO
), which is an analog of technetium, was developed, and the extraction separation characteristics were evaluated. In the organic solvent system using TOA as an extractant, quantitative extraction was achieved only in the acidic region, whereas in the case of using [TOAH][Cl], ReO can be extracted into the ionic liquid phase with an extremely high distribution ratio of 10
or more even in the neutral region, which is the pH of radioactively contaminated water. Thus, it was suggested that the developed ionic liquid extraction system can efficiently separate technetium from neutral aqueous solutions such as radioactively contaminated water.
Osugi, Haruka; Kim, S.-Y.*; Okamura, Hiroyuki
no journal, ,
To extract the platinum group metals, Ru(III), Rh(III) and Pd(II) from the high-level radioactive liquid waste (HLLW), a thiodiglycolamide(TDGA)type extractant, CF
Bn-TDGA, was synthesized. The extraction properties of platinum group metals from an aqueous nitric acid solution were evaluated using ionic liquids containing the extractant. CFBn-TDGA could extract almost all Pd(II) using [Bmim][NTf
] (1-butyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imide) and [Bmim][NfO] (1-butyl-3-methylimidazolium nonafluorobutanesulfonate) as ionic liquids. In addition, the extractability of Ru(III) and Rh(III), which are difficult to extract from an aqueous nitric acid solution, increased by using an ionic liquid, [Bmim][NfO], as the solvent. Furthermore, because the extractability of Ru(III) and Rh(III) was improved under the condition at 50
C, it also has an advantage in the extraction of platinum group metals from HLLW containing heat-generating nuclides. These results indicate that Ru(III), Rh(III) and Pd(II) contained in HLLW can be collectively extracted by using the TDGA type extractant in combination with [Bmim][NfO].