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Shimojo, Kojiro; Aoyagi, Noboru; Saito, Takumi*; Okamura, Hiroyuki; Kubota, Fukiko*; Goto, Masahiro*; Naganawa, Hirochika
Analytical Sciences, 30(2), p.263 - 269, 2014/02
Times Cited Count：49 Percentile：86.18(Chemistry, Analytical)Kubota, Fukiko*; Shimobori, Yosuke*; Baba, Yuzo*; Koyanagi, Yusuke*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
Journal of Chemical Engineering of Japan, 44(5), p.307 - 312, 2011/05
Times Cited Count：57 Percentile：82.68(Engineering, Chemical)The application of ionic liquids as alternatives to conventional organic solvents in extraction processes has been actively investigated. A crucial step towards the practical use of ionic liquids is the development of extractants that work effectively within these new media. In the present study, the extraction separation of rare earth metals into ionic liquids, 1-butyl, 1-octyl, and l-dodecyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C
min][Tf
N], 
= 4, 8, 12), was performed using a novel extractant, 
,-dioctyldiglycol amic acid (DODGAA). Quantitative extraction of metal ions such as Y
and Eu was selectively achieved in the presence of the base metal ion Zn
, which was not extracted at all under the present experimental conditions. The extraction efficiency was enhanced for the shorter-alkyl-chain imidazolium ionic liquid [C
mim] [TfN] compared to that for a conventional organic solvent system. Extraction mechanism studies elucidated that the metal extraction proceeds via proton exchange reactions between DODGAA and the metal ions in the ionic liquid (the same mechanism as in the conventional organic solvent). The stripping reaction, or recovery, of the metal ions from the extracting phase was readily accomplished with an acid solution such as nitric acid.
Kubota, Fukiko*; Shimobori, Yosuke*; Koyanagi, Yusuke*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
Analytical Sciences, 26(3), p.289 - 290, 2010/03
Times Cited Count：49 Percentile：82.68(Chemistry, Analytical)We have developed a highly stable supported liquid membrane based on ionic liquids (ILs) for the separation of rare-earth metals, employing 
-dioctyldiglycol amic acid as a mobile carrier. The quantitative transport of Y and Eu through the membrane was successfully attained, and separation from metal impurities, Zn, was efficiently accomplished. A membrane stable enough for long-term operation was constructible from imidazolium-based ILs having a longer alkyl chain, such as octyl or dodecyl groups in an imidazolium cation.
Kubota, Fukiko*; Shimobori, Yosuke*; Koyanagi, Yusuke*; Nakashima, Kazunori*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
Solvent Extraction Research and Development, Japan, 16, p.142 - 146, 2009/00
Kubota, Fukiko*; Koyanagi, Yusuke*; Nakashima, Kazunori*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
Solvent Extraction Research and Development, Japan, 15, p.81 - 87, 2008/00
Extraction of lanthanide ions was carried out with the organophosphorous extractant PC-88A dissolved in an imidazolium-based ionic liquid. PC-88A was soluble in ionic liquids having long-chain alkyl substituents such as octyl and dodecyl groups, [C
mim] and [C
mim][TFSI], although short-chain imidazolium ionic liquids could not solubilize the extractant. The extraction equilibrium observed in the ionic liquid system was similar to that in the n-dodecane system, and the extraction behavior could be explained by the same proton exchange mechanism as for the conventional organic solvent system, although the extraction efficiency was not improved. An ionic liquid having shorter alkyl chain [Cmim] showed a higher extraction ability than [Cmim][TFSI]. Stripping of the metal ions from the ionic liquids was also examined. Quantitative stripping of the metal ions was achieved by nitric acid in the [Cmim][TFSI] system.
Shimojo, Kojiro; Naganawa, Hirochika; Noro, Junji*; Kubota, Fukiko*; Goto, Masahiro*
Analytical Sciences, 23(12), p.1427 - 1430, 2007/12
Times Cited Count：69 Percentile：88.95(Chemistry, Analytical)The extraction and separation of lanthanides have been investigated using CHON type extractants, which are composed of only C, H, O, and N atoms. N, N-dioctyldiglycol amic acid (DODGAA) shows the high extraction and separation performances for heavier lanthanides compared with typical CHON type extractants. On the other hand, N, N, N', N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) provides the unprecedentedly high selectivity for lighter lanthanides. Furthermore, it was found that the combination of DODGAA and TPEN under suitable conditions enables the mutual separation of light, middle, and heavy lanthanides.
Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
Nihon Ion Kokan Gakkai-Shi, 18(4), p.370 - 373, 2007/10
The extraction behavior of lanthanides from aqueous solutions into ionic liquids (ILs) and the stripping test have been investigated with N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) as a ligand. TPEN in ILs shows the extremely high extraction performance for lanthanides compared to that in chloroform. The stripping of lanthanides from ILs into a receiving phase is successfully achieved under acidic conditions. Furthermore, the leaching of TPEN from ILs into the receiving phase is negligible small, although almost all TPEN molecules in chloroform readily leach.
Kubota, Fukiko*; Koyanagi, Yusuke*; Nakashima, Kazunori*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
Solvent Extraction Research and Development, Japan, 14, p.115 - 120, 2007/00
We carried out the extraction of a protein cytochrome c (Cyt-c) with an ionic liquid with an attached crown ether moiety in the imidazolium cation. The functional ionic liquid, [18C6mim][PF
], was dissolved in two different ionic liquids as diluents, one having a hydroxyethyl group, [COHmim][TfN], and the other an ethyl group, [Cmim][TfN], respectively. The transfer of Cyt-c from the aqueous phase to the ionic liquid phase took place with [18C6mim][PF] in the [COHmim][TfN] system. Although the extraction ability was lower than that of dicyclohexano-18-crown-6 (DCH18C6), the functionalized ionic liquid system gave a better stripping performance than the ordinary crown ether system. The extraction efficiency was not influenced by operating temperature when the concentration of [18C6mim] was high whereas it was greatly affected by temperature at low [18C6mim] concentration.
-tetrakis(2-pyridylmethyl)ethylenediamineShimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
Chemistry Letters, 35(5), p.484 - 485, 2006/05
Times Cited Count：31 Percentile：64.63(Chemistry, Multidisciplinary)The extraction behavior of lanthanides from aqueous solutions into an ionic liquids (IL) was investigated with -tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) as a ligand. The extraction performance of TPEN for lanthanides is greatly enhanced by dissolution in IL compared to in chloroform. Furthermore, the stripping of lanthanides from IL into a receiving phase is successfully achieved under acidic conditions.
Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Kubota, Fukiko*; Koyanagi, Yusuke*; Nakashima, Kazunori*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
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Kubota, Fukiko*; Koyanagi, Yusuke*; Nakashima, Kazunori*; Shimojo, Kojiro; Kamiya, Noriho*; Goto, Masahiro*
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no abstracts in English
Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Yaita, Tsuyoshi; Suzuki, Shinichi; Goto, Masahiro*
no journal, ,
The extraction behavior of lanthanides from aqueous solutions into ionic liquids (ILs) and the stripping test have been investigated with N, N, N', N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) as a ligand. TPEN in ILs shows the extremely high extraction performance for lanthanides compared to that in chloroform. The stripping of lanthanides from ILs into a receiving phase is successfully achieved under acidic conditions. Furthermore, the leaching of TPEN from ILs into the receiving phase is negligible small, although almost all TPEN molecules in chloroform readily leach.
Shimojo, Kojiro; Kurahashi, Kensuke; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Shimojo, Kojiro; Kurahashi, Kensuke; Naganawa, Hirochika; Kubota, Fukiko*; Goto, Masahiro*
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Shimojo, Kojiro; Kubota, Fukiko*; Goto, Masahiro*; Naganawa, Hirochika
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no abstracts in English
