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Combination of size selective binding ability of 18-crown-6 dissolved in aqueous phase and extractive properties of an amic acid; toward enhancement of rare earths separation

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Abstract

The separation of La(III), Eu(III) and Er(III) ions by an amic acid, N,N-dioctyldiglycolamic acid (HL), dissolved in carbon tetrachloride has been improved in the presence of 18-crown-6 (18C6) in aqueous phase as a selective masking agent. The interaction between the studied metal ions and 18C6 resulted a shift in the extraction curve of the studied metal ions versus pH toward higher pH region. The displacement of the extraction curves was more pronounced for lanthanum ions and was varied as La(III) > Eu(III) > Er(III). This order of complexing ability of 18C6 toward the studied ions was attributed to the size adaptation of the ions and that of the crown ether cavity. The stability constants of the lanthanide–crown ether complexes in aqueous phase were evaluated. The influence of temperature on the extraction of studied metal ions from aqueous phase in the absence and the presence of 18C6 was tested in the range 298–308 K. This investigation allowed evaluating the thermodynamic parameters associated with the extraction process and those of the complexation of cations by 18C6 in the aqueous phase.

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Authors and Affiliations

  1. PhaseEquilibria Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran

    Reyhaneh Safarbali, Mohammad Reza Yaftian & Massomeh Ghorbanloo

  2. Environmental Science Research Laboratory, Department of Environmental Science, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran

    Abbasali Zamani

Authors
  1. Reyhaneh Safarbali
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  2. Mohammad Reza Yaftian
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  3. Abbasali Zamani
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  4. Massomeh Ghorbanloo
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Correspondence to Mohammad Reza Yaftian.

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Safarbali, R., Yaftian, M.R., Zamani, A. et al. Combination of size selective binding ability of 18-crown-6 dissolved in aqueous phase and extractive properties of an amic acid; toward enhancement of rare earths separation. J IRAN CHEM SOC 13, 2085–2091 (2016). https://doi.org/10.1007/s13738-016-0926-7

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  • DOI: https://doi.org/10.1007/s13738-016-0926-7

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