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Journal Articles

Lanthanide extraction using a thiodiglycolamic acid extractant; Effect of S-donor on lanthanide separation

Shimojo, Kojiro; Fujiwara, Iori*; Oshima, Tatsuya*; Yokoyama, Keiichi; Yaita, Tsuyoshi

Analytical Sciences, 38(7), p.1003 - 1006, 2022/07

 Times Cited Count:0 Percentile:0(Chemistry, Analytical)

Liquid-liquid extraction of lanthanide (Ln) ions was investigated using $$N,N$$-dioctylthiodiglycolamic acid (DOTDGAA), which is a sulfur donor ligand with an amide group and a carboxyl group connected by a thioether chain. The extraction performance and selectivity of DOTDGAA for Ln ions were compared with those of $$N,N$$-dioctyldiglycolamic acid (DODGAA), which is also an oxygen donor ligand with a similar chemical structure, to assess the effect of the soft/hard donor atom on Ln separation. DOTDGAA quantitatively extracted all Ln ions while being selective toward light and middle Ln ions, in contrast to the selectivity of DODGAA for heavier Ln ions. Slope analysis demonstrated that the Ln$$^{3+}$$ transfer using DOTDGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, Ln(DOTDGAA)$$_{3}$$. The back-extraction of Ln ions from the extracting phase was successfully achieved under acidic conditions.

Journal Articles

A Comprehensive extraction study using a mono-alkylated diglycolamic acid extractant; Comparison between a secondary amide group and a tertiary amide group

Sugita, Tsuyoshi; Fujiwara, Iori*; Okamura, Hiroyuki; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika; Shimojo, Kojiro

Solvent Extraction Research and Development, Japan, 24(2), p.61 - 69, 2017/05

We investigated an influence of amide group in diglycolamic acid-type extractants on extraction property of metal ions. The extraction characteristics of $$N$$-dodecyldiglycolamic acid (C$$_{12}$$DGAA), with a secondary amide group, for 56 metal ions have been investigated, and compared with those of $$N,N$$-dioctyldiglycolamic acid (DODGAA) with a tertiary amide group. Compared with DODGAA, C$$_{12}$$DGAA has a poor extraction performance and separation ability for rare-earth metal ions, except for Sc(III). However, C$$_{12}$$DGAA tended to provide better extraction for relatively small-sized metal ions than DODGAA. In addition, it was found that C$$_{12}$$DGAA enables the selective removal of Hg(II) from aqueous solutions containing various divalent metal ions.

Journal Articles

Extraction behavior of rare-earth elements using a mono-alkylated diglycolamic acid extractant

Shimojo, Kojiro; Fujiwara, Iori*; Fujisawa, Kiyoshi*; Okamura, Hiroyuki; Sugita, Tsuyoshi; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika

Solvent Extraction Research and Development, Japan, 23(2), p.151 - 159, 2016/05

Liquid-liquid extraction of rare-earth (RE) cations has been investigated using $$N$$-dodecyldiglycolamic acid (C$$_{12}$$DGAA) with a secondary amide group, and compared with that using $$N,N$$-dioctyldiglycolamic acid (DODGAA) with a tertiary amide group. C$$_{12}$$DGAA enables quantitative transfer of all RE cations from moderately acidic solution, while being selective toward the heavier RE cations, and performs better than typical carboxylic-acid-type extractants. However, C$$_{12}$$DGAA provides low extraction performance and separation ability for RE cations compared with DODGAA because of the weaker basicity of the amide oxygen. Slope analysis demonstrated that RE$$^{3+}$$ transfer with C$$_{12}$$DGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, RE(C$$_{12}$$DGAA)$$_{3}$$. Structural characterization by X-ray diffraction revealed that three $$N$$-butyldiglycolamic acid (C$$_{4}$$DGAA) molecules coordinated to the La$$^{3+}$$ central ion in a tridentate fashion and the La$$^{3+}$$ primary coordination sphere consisted of three oxygen atoms from the amide group, three oxygen atoms from the ether group, and three oxygen atoms from the carboxy group.

Oral presentation

Application of cyclopentyl methyl ether as a diluent in the liquid-liquid extraction system for metal ions

Fujiwara, Iori; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika

no journal, , 

no abstracts in English

Oral presentation

Diglycolamic acid-substituted calix[4]arene; Lanthanide extraction and analysis of coordination structure

Yabe, Makoto; Fujiwara, Iori; Okamura, Hiroyuki; Sairenji, Shiho; Ohashi, Akira*; Naganawa, Hirochika; Shimojo, Kojiro

no journal, , 

no abstracts in English

Oral presentation

Comprehensive extraction study using novel extractants composed of a diglycolamic acid framework

Fujiwara, Iori; Yabe, Makoto; Okamura, Hiroyuki; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika; Shimojo, Kojiro

no journal, , 

no abstracts in English

Oral presentation

Diglycolamic acid extractant; Relationship between substituent group and extraction separation performance

Shimojo, Kojiro; Fujiwara, Iori*; Okamura, Hiroyuki; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika

no journal, , 

The extractant plays a key role in the extraction efficiency and the separation operation. Thus, the development of novel extractants, which perform better than conventional commercial extractants, is required for effective separation of metal ions. In this study, we have developed diglycolamic acid (DGAA) ligand as a new extractant. Extraction behavior of 56 metal ions using DGAA extractants was comprehensively investigated, and basic data on the extraction performance and selectivity of DGAA extractants was collected. In addition, we demonstrated the relationship between substituent group and extraction separation performance of DGAA extractants by the difference in performance of tertiary amide and secondary amide.

Oral presentation

Comprehensive metal extraction using thiodiglycolamic acid extractant; Effect of soft-donor on extraction

Shimojo, Kojiro; Fujiwara, Iori*; Sugita, Tsuyoshi; Ueda, Yuki; Okamura, Hiroyuki; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika

no journal, , 

We have synthesized a thiodiglycolamic acid type ligand with a soft donor atom as a novel extractant. Extraction behavior of 56 metal ions using this extractant was comprehensively investigated. By comparing the extraction properties of this extractant with those of a diglycolamic acid type ligand with a hard donor atom, the effect of soft-hard property in the ether-site on extraction characteristics was clarified.

Oral presentation

Effect of amide group and ether chain in diglycolamic acid-type extractants on extraction performance

Sugita, Tsuyoshi; Fujiwara, Iori*; Okamura, Hiroyuki; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika; Shimojo, Kojiro

no journal, , 

The extractant plays a key role in solvent extraction. Previous studies reveal that acidic extractant with tridentate structure, DGAA, has superior extraction performance for various metal ions. in this study, to investigate a effect of each functional group in DGAA-type extractant, we carried out are synthesis and evaluation of analogous extractants of DGAA. In the result, the secondary amide-type DGAA tended to provide better extraction for relatively small-sized metal ions than tertiary amide-type DGAA, and the thioether chain-type DGAA showed superior extraction ability for soft metal ions compared to ether chain-type DGAA.

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