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Journal Articles

Continuous liquid-liquid extraction of uranium from uranium-containing wastewater using an organic phase-refining-type emulsion flow extractor

Nagano, Tetsushi; Naganawa, Hirochika; Suzuki, Hideya; Toshimitsu, Masaaki*; Mitamura, Hisayoshi*; Yanase, Nobuyuki*; Grambow, B.

Analytical Sciences, 34(9), p.1099 - 1102, 2018/09

https://doi.org/10.2116/analsci.18N002

Times Cited Count：12 Percentile：45.99(Chemistry, Analytical)

A previously reported emulsion flow (EF) extraction system does not include a device for refining used solvent. Therefore, the processing of large quantities of wastewater by using the EF extractor alone could lead to the accumulation of wastewater components into the solvent and diminished extraction performance. In the present study, we have developed a solvent-washing-type EF system, which is equipped with a unit for washing used solvent to prevent accumulation, and successfully applied it for treating uranium-containing wastewater.

Journal Articles

Schiff based ligand containing nano-composite adsorbent for optical copper(II) ions removal from aqueous solutions

Awual, M. R.; Eldesoky, G. E.*; Yaita, Tsuyoshi; Naushad, M.*; Shiwaku, Hideaki; Alothman, Z. A.*; Suzuki, Shinichi

Chemical Engineering Journal, 279, p.639 - 647, 2015/11

https://doi.org/10.1016/j.cej.2015.05.049

Times Cited Count：251 Percentile：99.32(Engineering, Environmental)

Journal Articles

Electron beam technologies for control of flue gases/wastewaters and their applications

Kojima, Takuji

Oyo Butsuri, 72(4), p.405 - 414, 2003/04

https://ci.nii.ac.jp/naid/80015878531

The advanced technologies are required to control pollutants e.g. dioxins in gas or water at extremely low concentration. The present paper introduces typical basic studies, developments of control technologies, and example of their industrial applications of electron beam technology having the features of oxidation, decomposition and detoxifying of such pollutants even at low concentration. It covers removal of SOx and NOx from coal-combustion flue gas, decomposition of gaseous volatile organic compound in off gas and dioxins in incineration flue-gas, purification of tap and wastewaters, and treatment of sewage/sludge.

Journal Articles

Selenium oxyanions; Highly selective uptake by a novel anion exchanger

Kozai, Naofumi; Onuki, Toshihiko; Komarneni, S.*

Journal of Materials Chemistry, 17(12), p.2993 - 2996, 2002/12

Here we report the extremely high and selective uptake of selenium oxyanions by a novel exchanger, Ni $_{1-x}$ Zn $_{2x}$ (OH) $_{2}$ (OCOCH $_{3}$ ) $_{2x}$ ・nH $_{2}$ O that has brucite-type hydroxide layers with OCOCH $_{3}$ anions in the interlayers. This Ni-Zn basic salt exhibited very high selectivity for Se(IV) (Kd = 9.0x10 $^{4}$ ml/g with an initial Se(IV) concentration of 1x10 $^{-4}$ M) in the presence of 0.1M Cl $^{-}$ solution while the well known anionic clay, Mg $_{2}$ Al(OH) $_{6}$ NO $_{3}$ ・nH $_{2}$ O showed a Kd of 6.0x10 $^{3}$ ml/g under the same conditions. The uptake of Se(IV) on the Ni-Zn basic salt was found to be irreversible when treated with solutions containing 1N Cl $^{-}$ , 1N NO $_{3}$ $^{-}$ , or 1N PO $_{4}$ $^{3-}$ , while the Se(IV) sorbed on anionic clay was easily desorbed in a 1M Cl $^{-}$ solution. This novel exchanger also showed high Kd (2.610 $^{3}$ ml/g at an initial Se concentration of 110 $^{-4}$ M) for Se(VI) and therefore it is expected to be useful for decontamination and removal of selenium oxyanions from contaminated water.