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Journal Articles

Evaluation of photocatalytic abilities by variation of conductivity and dimethyl sulfoxide; Photocatalytically active TiO$$_{2}$$-coated wire mesh prepared via a double-layer coating method

Mori, Masanobu*; Sugita, Tsuyoshi; Fujii, Kengo*; Yamazaki, Taiki*; Isaka, Mayu*; Kobayashi, Kentaro*; Iwamoto, Shinji*; Itabashi, Hideyuki*

Analytical Sciences, 34(12), p.1449 - 1453, 2018/12

 Percentile:100(Chemistry, Analytical)

The photocatalyst coating stainless-steel wire mesh (TiO$$_{2}$$-WM) was prepared by double-layer coating method. The TiO$$_{2}$$-WM was evaluated using flow analytical system, which included the reactor and conductimetric detector (FAS-CD). The DMSO decomposition test through the FAS-CD reveal that photocatalytst was stable coating on the stainless-steel wire mesh.

Journal Articles

Extraction ability of 4-benzoyl-3-phenyl-5-isoxazolone towards 4f-ions into ionic and molecular media

Atanassova, M.*; Okamura, Hiroyuki; Eguchi, Ayano; Ueda, Yuki; Sugita, Tsuyoshi; Shimojo, Kojiro

Analytical Sciences, 34(8), p.973 - 978, 2018/08

 Times Cited Count:4 Percentile:18.4(Chemistry, Analytical)

The distribution constants of 4-benzoyl-3-phenyl-5-isoxazolone (HPBI) and deprotonated one (PBI$$^{-}$$) between hydrophobic ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C$$_{1}$$C$$_{4}$$im][Tf$$_{2}$$N]) and aqueous phases were determined, together with the acid-dissociation constant of HPBI. The solvent extraction of three selected lanthanoid ions (La$$^{3+}$$, Eu$$^{3+}$$, and Lu$$^{3+}$$) with HPBI from aqueous nitrate phase into [C$$_{1}$$C$$_{4}$$im][Tf$$_{2}$$N] has been investigated. Application of the ionic liquid as the extracting phase greatly enhanced the extraction performance of HPBI for lanthanoid ions compared with that in the chloroform system. The composition of the extracted species was established to be anionic tetrakis entities, Ln(PBI)$$_{4}$$$$^{-}$$, for light, middle, and heavy lanthanoid ions in an ionic environment.

Journal Articles

A Fluorometric skin-interfaced microfluidic device and smartphone imaging module for ${{it in situ}}$ quantitative analysis of sweat chemistry

Sekine, Yurina; Kim, S. B.*; Zhang, Y.*; Bandodkar, A. J.*; Xu, S.*; Choi, J.*; Irie, Masahiro*; Ray, T. R.*; Kohli, P.*; Kozai, Naofumi; et al.

Lab on a Chip, 18(15), p.2178 - 2186, 2018/08

The rich composition of solutes and metabolites in sweat and its relative ease of collection upon excretion from skin pores make this class of biofluid an attractive candidate for point of care analysis. Here, we present a complementary approach that exploits fluorometric sensing modalities integrated into a soft, skin-interfaced microfluidic system which, when paired with a simple smartphone-based imaging module, allows for in-situ measurement of important biomarkers in sweat. A network array of microchannels and a collection of microreservoirs pre-filled with fluorescent probes that selectively react with target analytes in sweat (e.g. probes), enable quantitative, rapid analysis. Field studies on human subjects demonstrate the ability to measure the concentrations of chloride, sodium and zinc in sweat, with accuracy that matches that of conventional laboratory techniques.

Journal Articles

Enhanced aqueous adsorption and photodecomposition of anionic organic target by amino group-modified TiO$$_{2}$$ as anionic adsorptive photocatalyst

Sugita, Tsuyoshi; Kobayashi, Kenichi*; Kobayashi, Kentaro*; Yamazaki, Taiki*; Fujii, Kengo*; Itabashi, Hideyuki*; Mori, Masanobu*

Journal of Photochemistry and Photobiology A; Chemistry, 356, p.71 - 80, 2018/04

Photocatalysts shows high redox property only by light irradiation. However, the reaction performance is lowered in aqueous phase due to the low contact efficiency between catalyst and targets. In this study, to enhance aqueous adsorption and photodecomposition of anionic organic target, we developed an amino functional-based spacer (3-[2-(2- aminoethylamino)ethylamino]propyl-trimethoxysilane, DETA), and used it to modify TiO$$_{2}$$. The modified catalyst with positively charged amino groups could enhance the adsorption and photodecomposition of anionic organic targets.

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

Pretreatment method in FIA by solvent extraction and the application possibility of novel solvent extraction method

Sugita, Tsuyoshi

Journal of Flow Injection Analysis, 33(1), p.39 - 40, 2016/06

A novel solvent extraction way, emulsion flow (EF) method, has been developed at JAEA. EF method achieves both good emulsion formation and quick phase separation only by solution sending. In this report, I referred Flow Injection Analysis (FIA) using solvent extraction as a preprocessing technique and introduced an outline of the EF method as such. Furthermore, I mentioned the application possibility of the EF method to the preprocessing in FIA with its advantage for extracting and concentrating a trace component from a large-volume sample.

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.

JAEA Reports

Horonobe Underground Research Laboratory Project; Research and development plan (H22-H26)

Iwatsuki, Teruki; Sato, Haruo; Nohara, Tsuyoshi; Tanai, Kenji; Sugita, Yutaka; Amano, Kenji; Yabuuchi, Satoshi; Oyama, Takuya; Amano, Yuki; Yokota, Hideharu; et al.

JAEA-Research 2011-009, 73 Pages, 2011/06

JAEA-Research-2011-009.pdf:4.41MB

The research and development plan in Horonobe Underground Research Laboratory are summarized according to the 2nd Midterm Plan till 2014 fiscal year of JAEA. In this midterm, galleries and the infrastructures for the research and development up to the depth of 350 m are constructed by Private Financial Initiative (PFI). Additionally Phase 3: Operation phase at the galleries begins in parallel to Phase 2: Construction phase. In these phases various research and development including collaboration with other institutes are conducted at the galleries. Generallic applicable techniques on the subject of the investigation of geological environment, facility construction in deep underground and the reliability of geological deposal are developed during the phase. The feasibility and reliance of various technologies concerning geological disposal is demonstrated by widely opening the outcome to the public in the society.

Oral presentation

Investigation and research on depth distribution in soil of radionuclides released by accident of Fukushima Daiichi Nuclear Power Station, TEPCO, 4; Depth distributions of radionuclides and estimation of the initial inventories

Sato, Haruo; Amano, Kenji; Niizato, Tadafumi; Tanaka, Shingo; Nohara, Tsuyoshi; Iwatsuki, Teruki; Murakami, Hiroaki; Sugita, Yutaka; Nakayama, Masashi; Abe, Hironobu; et al.

no journal, , 

Accident of Fukushima Daiichi Nuclear Power Station, TEPCO occurred by Tsunami caused by Tohoku Pacific Ocean Earthquake on 11 March, 2011. Part of the radionuclides in atomic reactors was released and accumulated on soil surface over the wide range of area in Fukushima Prefecture by rain after being transported by wind. This work was carried out as one of the projects which were published by Council for Science and Technology Policy on 19 May and investigation on the depth distribution of radionuclides in soil was carried out. Also the inventories of radionuclides accumulated on soil surface immediately after the occurrence of accident were estimated. In this presentation, we report the apparent diffusion coefficients Da of radionuclides and the inventories of radionuclides on soil surface immediately after the occurrence of accident among a series of investigation and research. $$^{134}$$Cs and $$^{137}$$Cs were detected in all investigation points (11 points), and $$^{129m}$$Te and $$^{110m}$$Ag were detected only in areas where spatial dose rate and the inventories of radionuclides have been evaluated to be high. The depth distributions of radionuclides were less than 5cm from surfaces except for the soil of farmland at many points. Radionuclides tended to be detected in deeper positions in the soil of farmland than in the soil of surface. Da values derived from the depth distributions for all radionuclides were nearly 1E-11 (m$$^{2}$$/s) for the soil of many points except for the soil of farmland. This is considered to be due to that those Da values were controlled by dispersion. The estimated inventories of radionuclides accumulated on soil surface immediately after the occurrence of accident were consistent with monitoring results so far.

Oral presentation

Investigation and research on depth distribution in soil of radionuclides released by accident of Fukushima Daiichi Nuclear Power Station, TEPCO, 3; Distribution coefficients of Cs and I onto soil

Tanaka, Shingo; Sato, Haruo; Niizato, Tadafumi; Amano, Kenji; Nohara, Tsuyoshi; Iwatsuki, Teruki; Murakami, Hiroaki; Sugita, Yutaka; Nakayama, Masashi; Abe, Hironobu; et al.

no journal, , 

The sorption distribution coefficients of cesium and iodine onto the soil are studied. The batch sorption experiments were conducted onto the 24 specimens obtained from 11 sites (12 geoslicers) at each two different depth compartment. The experiments were based on the way standardized by Atomic Energy Society of Japan. The Kd values of cesium ranged from 1,000 to 100,000 ml/g, corresponding to the result that most of the cesium in the investigation sites are stayed in the surface of the ground. On the other hand, the Kd values of iodine ranged from 0.4 to 150 ml/g. It is likely that the difference of Kd values is affected by not only the chemical form of the elements between cesium and iodine, but also mineral composition, cation and anion exchange capacities, content of organic matter, and so on. This investigation initially focuses on varieties of soil, such as sandy or clayey soil, and soil colors.

Oral presentation

Investigation and research on depth distribution in soil of radionuclides released by accident of Fukushima Daiichi Nuclear Power Station, TEPCO, 2; Topography of investigation area, selection of the investigation point and soil distribution in depth direction

Niizato, Tadafumi; Sato, Haruo; Amano, Kenji; Nohara, Tsuyoshi; Iwatsuki, Teruki; Aoki, Kazuhiro; Tanaka, Shingo; Murakami, Hiroaki; Sugita, Yutaka; Nakayama, Masashi; et al.

no journal, , 

Investigation and research on depth distribution in soil of radionuclides released by accident of Fukushima Daiichi Nuclear Power Station, TEPCO.

Oral presentation

Investigation and research on depth distribution in soil of radionuclides released by accident of Fukushima Daiichi Nuclear Power Station, TEPCO, 1; Overview of the investigation and research

Aoki, Kazuhiro; Sato, Haruo; Niizato, Tadafumi; Amano, Kenji; Tanaka, Shingo; Nohara, Tsuyoshi; Iwatsuki, Teruki; Murakami, Hiroaki; Sugita, Yutaka; Nakayama, Masashi; et al.

no journal, , 

Field survey on depth distribution in soil of radionuclides released by accident of Fukushima Daiichi Nuclear Power Station was conducted by using Geoslicer. Investigation was conducted in the middle of June after 3 months of the accident. This paper reports the outline of the investigation.

Oral presentation

Development of new separation and analytical systems on green chemistry

Shimojo, Kojiro; Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika

no journal, , 

Our group has studied solvent extraction as one of novel separation and analytical methods. We introduce three approaches (synthesis of novel extractant, improvement of extraction media, and development of extraction equipment) to progress solvent extraction systems. In this young meeting, we devote much effort to make graduate students understand our research and to recruit excellent young chemists.

Oral presentation

Recovery of rare metals and comprehensive extraction study using a novel acidic diamide-type ligand

Shimojo, Kojiro; Yabe, Makoto*; Sugita, Tsuyoshi; Okamura, Hiroyuki; Ohashi, Akira*; Naganawa, Hirochika

no journal, , 

Solvent extraction is an effective method for the separation and purification of metal ions. The extractant plays a key role in the extraction efficiency and the separation operation. In this study, we have synthesized a novel acidic diamide-type extractant and have comprehensively investigated the extraction of 56 metal ions. It was found that the novel extractant provides excellent extraction performance and separation ability for various rare metal ions such as Sc(III), In(III), Ga(III), and Ni(II) compared with conventional extractants.

Oral presentation

Comprehensive extraction study of metal ions using novel phosphorus ligand

Sugita, Tsuyoshi; Shimojo, Kojiro; Okamura, Hiroyuki; Naganawa, Hirochika

no journal, , 

Solvent extraction is an effective technique for separation of metal ions in water, and the extraction behavior of metal ions depends on the performance of extractant. In this study, novel organophosphorus extractant (DOAOBPA) with a phosphate group and an amide group connected through an ether chain was synthesized, and comprehensive extraction of 56 metal ions has been investigated. It was found that the extraction performance of DOAOBPA was extremely higher than that of conventional organophosphorus extractants. In addition, DOAOBPA showed a unique extraction property to the divalent metal ions and the alkali metal ions.

Oral presentation

Comprehensive extraction study of metal ions using an acidic diamide-type ligand

Shimojo, Kojiro; Yabe, Makoto*; Sugita, Tsuyoshi; Okamura, Hiroyuki; Ohashi, Akira*; Naganawa, Hirochika

no journal, , 

Solvent extraction is an effective method for the separation and purification of metal ions (e.g. recovery of rare metal and removal of toxic metal). The extractant plays a key role in the extraction efficiency and the separation operation. To date, much effort has been devoted to the development of novel extractants. Most approaches, however, have encountered problems on expensive production cost and low solubility in alkane solvents, and are far from ideal extraction system for practical use. In previous study, we developed inexpensively a diglycolamic acid-type extractant (DODGAA) with monoamide and carboxy group connected by an ether chain, and reported that DODGAA performed better than commercial extractants. In this study, we have synthesized a novel acidic diamide-type extractant (TONTADA) with diamide and carboxy group connected by a nitrogen donor, and have comprehensively investigated the extraction performance. It was found that the TONTADA selectively extracts valuable metal ions such as Cu(II), Ni(II), and Co(II) from base metal ions compared with DODGAA.

Oral presentation

Diglycolamic acid-type extractant for rare-earth elements

Shimojo, Kojiro; Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika

no journal, , 

We report on solvent extraction of rare-earth (RE) cations using N,N-dioctyldiglycolamic acid (DODGAA) as a novel extractant. This extractant enables the quantitative partitioning of all rare-earth metal ions (RE$$^{3+}$$) from moderately acidic solutions, while showing selectivity for heavier lanthanides, and provides remarkably high extraction separation performance for RE$$^{3+}$$ compared with commercial extractants. Slope analysis demonstrated that RE transfer with DODGAA proceeded through a proton-exchange reaction, forming a 1:3 complex. Structural characterization by X-ray diffraction revealed that three ligand molecules coordinated to the La3+ 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

Comprehensive extraction of metal ions using novel phosphorus extractant with tridentate structure

Sugita, Tsuyoshi; Shimojo, Kojiro; Okamura, Hiroyuki; Naganawa, Hirochika

no journal, , 

Since the solvent extraction efficiency depends on the ability of extractants, the development of high performance extractants has been strongly desired. In this study, a novel organophosphorus extractant having a tridentate structure was originally synthesized, and its extraction performance was exhaustively evaluated by investigating the extraction of 56 metal ions. As a result, the extraction performance of this extractant was extremely higher than that of conventional organophosphorus extractants for almost all of the metal ions.

Oral presentation

Development of acidic diamide-type ligand and extraction performance for matal ions

Shimojo, Kojiro; Sugita, Tsuyoshi; Yabe, Makoto*; Okamura, Hiroyuki; Ohashi, Akira*; Naganawa, Hirochika

no journal, , 

Solvent extraction is an effective method for the separation and purification of metal ions. The extractant plays a key role in the extraction efficiency and the separation operation. In this study, we have synthesized a novel acidic diamide-type extractant and have comprehensively investigated the extraction of 56 metal ions. It was found that the novel extractant provides excellent extraction performance and separation ability for various rare metal ions such as Sc(III), In(III), Ga(III), and Ni(II) compared with conventional extractants.

Oral presentation

Comprehensive extraction study using an acidic diamide-type ligand with tetradentate structure

Shimojo, Kojiro; Sugita, Tsuyoshi; Yabe, Makoto*; Okamura, Hiroyuki; Ohashi, Akira*; Naganawa, Hirochika

no journal, , 

Solvent extraction is an effective method for the separation and purification of metal ions. In previous study, we developed dioctyldiglycolamic acid extractant (DODGAA) with an amide group and a carboxy group connected by an ether chain, and reported DODGAA performs better than commercial extractants. In this study, we have synthesized a novel acidic diamide-type extractant (TONTADA) with two amide groups and a carboxy group connected by a nitrogen donor atom and have comprehensively investigated the extraction of 56 metal ions. It was found that the novel extractant TONTADA provides excellent extraction performance and separation ability for various rare metal ions such as Sc(III), Cu(II), Ni(II), Co(II), In(III), Ga(III), Hg(II), platinum-group metal, Hf(IV), V(V), Mo, W(VI), and Re(VII) compared with conventional extractants and DODGAA.

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