Papers - OHE Kaoru
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Adsorption Behaviour of As, Sb and Se Using MFe2O4 (M=Fe, Co, Mn)
Ohe, K, Sugimoto, M., Oshima, T., Baba, Y.
Proc. Ion Exchange 2016 1 - 9 2016.7
Language：English Publishing type：Research paper (international conference proceedings)
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Enkhzaya S.
Journal of Environmental Science and Technology 9 ( 5 ) 379 - 389 2016
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Environmental Science and Technology
© 2016 Solongo Enkhzaya et al. Objective: This study aimed to study the mobility of heavy metals using sequential extraction analysis and assess heavy metals in soil samples of mining tailing around the small-scale gold mining areas at Boroo and Zuunkharaa in Mongolia. Methodology: The samples were collected from small scale gold mining area existed in Tov and Selenge province, Mongolia. Physicochemical, chemical and some statistical analysis were made for the mining tailing samples. Results: The pH of the mining tailing samples was determined as 6.10-7.37 and the texture was classified in a silt (Si) and silt loam (SiL) types. The contents of As, Pb and Mn in the samples were determined at very high, 1346-2970, 115-685 and 354-488 mg kg-1by using the XRF analysis. From the predictive analysis, the mining tailing samples contain the residues from small-scale gold mining processing that are characterized by relatively high concentrations of heavy metals. Therefore, 5 steps sequential extraction analysis (Tessier method) was used for the determination of the metals of Al, Mn, Fe, As, Cd and Pb in the small-scale gold mining tailings. Conclusion: In the sequential extraction analysis, Cd, Pb, Fe and Mn are mainly extracted in the Fe/Mn oxides fraction, but As and Al are mainly extracted in the residual fraction. Boroo and Zuunkharaa gold mining area polluted by Pb, Mn, Fe, Al and Cd for measurably level, further assessment of the environmental status is necessary to these areas.
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Oshima T., Kaneizumi K., Ohe K., Baba Y.
Separation and Purification Technology 141 301 - 306 2015.2
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Separation and Purification Technology
© 2014 Elsevier B.V. All rights reserved. p-tert-Octylphenoxyacetic acid ( t OP-OCH 2 COOH) was a better extractant for Cu(II) than was a commercial aliphatic carboxylic acid extractant, namely Versatic 10. In the present study, the synergistic effect of nitrogen-containing donors (N-donors) on the extraction of divalent base-metal ions using t OP-OCH 2 COOH was studied. Pyridine (Py), 2,2′-bipyridine (Bpy), and 1,10-phenanthroline (Phen) were added as synergists. The addition of N-donors to organic phases containing t OP-OCH 2 COOH enhanced the extractabilities of the divalent metals Mn(II), Co(II), Ni(II), Cu(II), and Zn(II). Addition of Phen was the most effective for the enhancement of metal extraction, but the selectivity was low. Synergistic extraction using a mixture of t OP-OCH 2 COOH and Py was more effective for the separation of divalent metal ions. A mixture of t OP-OCH 2 COOH and Bpy gave moderate extraction and selectivity; the following reaction was suggested for the extraction of Cu(II):Cu(aq)2++Bpy (org) +1.5( t OP-OCH 2 COOH)2(org) Cu 2+ (Bpy)( t OP-OCH 2 COOH)( t OP-OCH 2 COO - )2(org) +2H(aq)+.
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Synergistic effect of nitrogen-containing donors on extraction of divalent metal ions using p-tert-octylphenoxyacetic acid Reviewed
T. Oshima, K. Kaneizumi, K.Ohe, Y.Baba
Sep.Purif.Technol. 141 301 - 306 2015.1
Language：English Publishing type：Research paper (scientific journal)
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N-ドテシルアニリンによる塩酸溶液からの白金(IV)の抽出平衡 Reviewed
土居礼佳、大榮薫、大島達也、馬場由成
化学工学論文集 40 ( 6 ) 470 - 474 2014.8
Language：Japanese Publishing type：Research paper (scientific journal)
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コウジ酸由来の新規抽出剤の開発とIn(III)およびGa(III)の高選択的抽出 Reviewed
土居礼佳、大榮薫、大島達也、馬場由成
化学工学論文集 40 ( 6 ) 475 - 480 2014.6
Language：Japanese Publishing type：Research paper (scientific journal)
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Cellulose aerogel regenerated from ionic liquid solution for immobilized metal affinity adsorption
Oshima T., Sakamoto T., Ohe K., Baba Y.
Carbohydrate Polymers 103 ( 1 ) 62 - 69 2014.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Carbohydrate Polymers
Surface morphology of cellulosic adsorbents is expected to influence the adsorption behavior of biomacromolecules. In the present study, cellulose aerogel regenerated from ionic liquid solution was prepared for use as a polymer support for protein adsorption. Iminodiacetic acid groups were introduced to the aerogel for immobilized metal affinity adsorption of proteins. A Cu(II)-immobilized iminodiacetic acid cellulose aerogel (Cu(II)-IDA-CA), which has a large specific surface area, showed a higher adsorption capacity than Cu(II)-immobilized iminodiacetic acid bacterial cellulose (Cu(II)-IDA-BC) and Cu(II)-immobilized iminodiacetic acid plant cellulose (Cu(II)-IDA-PC). In contrast, the Cu(II)-immobilized cellulosic adsorbents showed similar adsorption capacities for smaller amino acid and peptides. The results show that cellulose aerogels are useful as polymer supports with high protein adsorption capacities. © 2013 Elsevier Ltd.
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Effect of Ionic Strength, Temperature on Equilibrium and Kinetics of Arsenic Adsorption using Magnetite
KAGAKU KOGAKU RONBUNSHU 40 ( 2 ) 90 - 97 2014.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Cellulose aerogel regenerated from ionic liquid solution for immobilized metal affinity adsorption Reviewed
Oshima, T., Sakamoto, T., Ohe, K., Baba, Y.
Carbohydrate Polymers 103 62 - 69 2014.1
Language：English Publishing type：Research paper (scientific journal)
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Doi Reika, Ohe Kaoru, Oshima Tatsuya, Baba Yoshinari
KAGAKU KOGAKU RONBUNSHU 40 ( 6 ) 470 - 474 2014
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Chemical Engineers, Japan
2-Dodecylsulfanylmethyl-5-hydroxy-pyran-4-one (DSHP) containing a pyrone moiety as a ligand was synthesized in order to develop a highly selective extractant for In(III) and Ga(III). The extraction selectivity of various metal ions from 1 mol dm<sup>3</sup> (=M) aqueous ammonium nitrate solution was examined for DSHP in toluene. Considering selective recovery of In(III) and Ga(III) from a residue of zinc refining and bauxite, In(III) and Ga(III) were selectively extracted over Zn(II) with DSHP, while Ga(III) was selectively extracted over Al(III) at low pH. This indicates that DSHP can be applied to selective separation of Ga(III) from bauxite. It was found that In(III) and Ga(III) were extracted with DSHP according to the following reaction: . The extracted complex was crystallized for analysis by <sup>1</sup>H-NMR. The extraction equilibrium constants for In(III) and Ga(III) with DSHP were determined to be 2.16 [-] and 3.59×10<sup>2</sup> [-], respectively. Moreover, the back extraction of In(III) and Ga(III) from the loaded organic phase was examined using various stripping agents. In(III) and Ga(III) extracted with DSHP were effectively stripped using HCl.
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Extraction Equilibrium of Platinum(IV) with <i>N</i>-Dodecylaniline
Doi Reika, Ohe Kaoru, Oshima Tatsuya, Baba Yoshinari
KAGAKU KOGAKU RONBUNSHU 40 ( 6 ) 470 - 474 2014
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Chemical Engineers, Japan
We have examined the extraction selectivity towards various metals of <i>N</i>-dodecylaniline, which has an aromatic secondary amine moiety, a weaker base than an aliphatic secondary amine. The selectivity of <i>N</i>-dodecylaniline in toluene for extraction from hydrochloric acid solution was examined by a batchwise method at 300 K, and Pt(IV), Pd(II) and Au(III) were found to be quantitatively extracted, while base metals were not extracted. Therefore, <i>N</i>-dodecylaniline as an extractant was found to be a highly selective for Pt(IV), Pd(II) and Au(III) over base metals. In the extraction of Pt(IV), it was suggested that different platinum complexes were extracted at low and high concentrations of hydrochloric acid. Pt(IV) was found to be extracted by the following extraction reactions from hydrochloric acid solution. Back extraction of the extracted Pt(IV) from the loaded organic phase was examined using various stripping agents, of which aqueous thiourea and thiourea containing HCl were found to be effective.
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Ohe Kaoru, Oshima Tatsuya, Baba Yoshinari
KAGAKU KOGAKU RONBUNSHU 40 ( 2 ) 90 - 97 2014
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Chemical Engineers, Japan
Effect of ionic strength and temperature on the equilibrium and kinetics of arsenic adsorption on magnetite prepared by precipitation were investigated. The adsorption of As(III) was independent of ionic strength. After the adsorption of As(III), the zeta potential decreased and the point of zero charge (PZC) of the magnetite shifted to the acidic side. The adsorption of As(III) was considered to be the result of inner-sphere complex formation because of the endothermic reaction and the positive entropy change in the As(III) adsorption reaction. The adsorption of As(V) increased with increasing ionic strength at higher pH than the PZC, and a shift of the PZC was observed after the adsorption of As(V). The exothermic reaction and the positive entropy change of the reaction indicated that the As(V) adsorption occurred by the mechanism of outer- and inner-sphere complex formation. The presence of phosphate and silicate greatly decreased the adsorption of As(III) and As(V). The rate-controlling step in the adsorption of As(III) and As(V) was found to be the intraparticle diffusion process, since the kinetics of As(III) and As(V) adsorptions can be explained by the Dünwald–Wagner equation.
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Oshima T., Ishizaka S., Morizono H., Ohe K., Baba Y.
Separation and Purification Technology 114 11 - 16 2013.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Separation and Purification Technology
Two types of alkylhistidine extractants, histidine-2-ethylhexyl amide (His-EH) and N-p-tert-octylphenoxyacetyl-histidine (OP-His) were prepared. The alkylhistidine extractants were impregnated onto a methacrylate-based polymer support to investigate the adsorption selectivity for metal ions. His-EH, which has coordinating imidazole and amino groups, adsorbs Cu(II), Ni(II), Zn(II) and Co(II) at pH > 5. By contrast, OP-His, which has imidazole and carboxyl groups, shows adsorption selectivity; Cu(II) > Zn(II) > Ni(II) > Co(II). A column was packed with OP-His impregnated resin to investigate the separation selectivity between Cu(II) and Co(II). Cu(II) was selectively adsorbed and was efficiently concentrated to 59 times the concentration of the feed solution. © 2013 Elsevier Ltd. All rights reserved.
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Adsorption behavior of metal ions on alkylhistidine extractant impregnated resins: Effect of functional groups of histidine Reviewed
Oshima, T., Ishizaka, S., Morizono, H., Ohe, K., Baba, Y.
Separation and Purification Technology 114 11 - 16 2013.4
Language：English Publishing type：Research paper (scientific journal)
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MAEDA Shota, KUROKI Kuniko, OHE Kaoru, OSHIMA Tatsuya, BABA Yoshinari
KAGAKU KOGAKU RONBUNSHU 38 ( 4 ) 226 - 233 2012.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Chemical Engineers, Japan
Bioethanol for fuel is a renewable energy alternative to petroleum. However, because of the azeotropic point between ethanol and water, the separation and concentration of ethanol to yield a product with low water content by the usual method of distillation requires considerable energy. To develop an environmentally friendly method for purification of bioethanol, we examined the adsorption of ethanol on activated carbon prepared from lignin. The adsorption properties of ethanol on activated carbons at 303 K were compared with those of commercially available high-silica zeolites in batchwise fashion. The specific surface areas of activated carbons were found to be about 2000 m<sup>2</sup> g<sup>−1</sup> by the nitrogen gas adsorption method. The adsorption rate of ethanol on activated carbons in powder form reached equilibrium within 0.5 min, and the adsorption isotherm of ethanol on activated carbons from aqueous solution was of the Freundlich type. The adsorption results revealed that the adsorption capacities of activated carbons for ethanol were influenced by their hydrophobicity, micropore size and percentage of micropore volume. The highest adsorption capacity for 5 vol% ethanol was 280 mg g<sup>−1</sup> of the activated carbons prepared from lignin (at 900°C and IR=2). Thermogravimetric analysis (TGA) of activated carbons and high-silica zeolites with adsorbed ethanol was carried out to examine the adsorption mechanisms of ethanol. In both cases, ethanol was found to be selectively adsorbed in preference to water. Finally, activated carbons prepared from lignin maintained their activity even over 20 cycles of adsorption and desorption.
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リグニンを原料とした活性炭の細孔構造とバイオエタノール吸着との定量的相関 Reviewed
前田 正太, 黒木 久仁子, 大榮 薫, 大島 達也, 馬場 由成
化学工学論文集 38 226 - 233 2012.7
Language：English Publishing type：Research paper (scientific journal)
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Enhancement of water solubility and dispersibility for poorly water-soluble nutrients by formation a conjugate with peptides
T. Oshima, N. Matsushita,Y. Yoneda, A. Inada, H. Takahashi, K. Ohe, Y. Baba
International Association of Colloid and Interface Scientist, Conference S5F34 2012.6
Language：English Publishing type：Research paper (scientific journal)
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Selective Extraction of Lysine-rich Proteins by formation of Supramolecular Complex with Macrocyclic Compounds
Tatsuya OSHIMA, Kaoru OHE, Yoshinari BABA
9th international Conference on Separation Science and Techmnology 2011.11
Language：English Publishing type：Research paper (international conference proceedings)
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Characteristics of Heme Iron Preparation from Fish Blood of Cultured Yellowtail
Masaya TODAKA, Tatsuya OSHIMA, Kaoru OHE, Yoshinari BABA
9th international Conference on Separation Science and Techmnology 2011.11
Language：English Publishing type：Research paper (international conference proceedings)
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Effect of pH, Ionic Srength, Coexsing loss on Arsenic Adsorption Using Magnetite
Kaoru OHE,Yasuyuki TAGAI, Tatsuya OSHIMA, Yoshinari BABA
9th international Conference on Separation Science and Techmnology 2011.11
Language：English Publishing type：Research paper (international conference proceedings)