Synergistic Extraction Equilibrium of Gallium(Ⅲ) with Di(2-ethylhexyl)phosphoric Acid and 8-Quinolinol Derivatives into Supercritical Carbon Dioxide Synergistic Extraction Equilibrium of Gallium(III) with Di(2-ethylhexyl)phosphoric Acid and 8-Quinolinol Derivatives into Supercritical Carbon Dioxide

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Abstract

The synergistic effect of five 8-quinolinol derivatives (HQs) on the extraction of gallium(III) with di(2-ethylhexyl)-phosphoric acid (D2EHPA or HA) from weak nitric acid into supercritical carbon dioxide (SC-CO<sub>2</sub>) was investigated. 8-Quinolinol (Hq), 5-ethoxymethyl-8-quinolinol (HO<sub>2</sub>q), 5-hexyloxymethyl-8-quinolinol (HO<sub>6</sub>q), 5-(2,2,2-trifluoroethoxymethyl)-8-quinolinol (HFO<sub>2</sub>q), and 5-chloro-8-quinolinol (5-Cl-Hq) were used as synergists. Synergism was observed for all of the HQs. The synergistic effect increased in the following order: Hq < HO<sub>2</sub>q < HFO<sub>2</sub>q < 5-Cl-Hq ≈ HO<sub>6</sub>q. The extent of synergism can be related to both the distribution constant and the acid dissociation constant of the HQ. The synergistic extraction equilibrium of gallium(III) with D2EHPA and 5-Cl-Hq into SC-CO<sub>2</sub> was investigated; the results suggest that the composition of the extracted complex is as GaA<sub>2</sub>Q·HA. The synergistic extraction mechanism was the same for both SC-CO<sub>2</sub> and <i>n</i>-heptane. The synergistic extraction equilibrium constants in both cases were calculated based on the experimental results.

Journal

  • Analytical Sciences

    Analytical Sciences 29(1), 127-132, 2013-01-10

    The Japan Society for Analytical Chemistry

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Codes

  • NII Article ID (NAID)
    10031147338
  • NII NACSIS-CAT ID (NCID)
    AA10500785
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09106340
  • NDL Article ID
    024212222
  • NDL Call No.
    Z54-F482
  • Data Source
    CJP  NDL  J-STAGE 
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