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Thermodynamics of interactions between lead(II) and cadmium(II) ions and azulene-based complexing polymer films

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Abstract

In order to understand the essential processes/interactions between the metal ions and modified electrodes which are based on complexing polymeric films, access to thermodynamic characteristics is compulsory. The paper enlarges the information concerning the sorption of metal ions within complexing polymer films, particularly based on azulene, which can be involved in metal detection sensors. Interactions between lead(II) or cadmium(II) ions and complexing polymer films have been studied using chemical preconcentration–anodic stripping method. The films have been obtained by controlled potential electrolysis in millimolar solutions of 4-azulen-1-yl-2,6-bis(2-thienyl)pyridine (L) in acetonitrile. PolyL films affinities towards these metal ions have been quantified at different temperatures by means of sorption isotherms. Parameters for sorption of lead(II) and cadmium(II) ions within polyL films have been calculated for Freundlich, Langmuir and Redlich–Peterson isotherms. The best fit was obtained when using Langmuir isotherm. The results evidence that lead ions are better sorbed than cadmium within polyL film. Thermodynamic parameters for the chemical sorption of lead(II) and cadmium(II) ions within polyL films have been calculated.

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Acknowledgments

The authors are grateful for the financial support from UEFISCDI projects ID 15/2011 and ID 236/2014, and the work done by Dr. Roxana Luisa Popescu (Mandoc) has been supported by the Sectorial Operational Programme Human Resources Development (SOP HRD), financed from the European Social Fund and the Romanian Government under the contract number POSDRU/159/1.5/S/137390.

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Authors and Affiliations

  1. Faculty of Applied Chemistry and Material Science, University “Politehnica” of Bucharest, 1-7 Gh. Polizu, 011061, Bucharest, Romania

    George-Octavian Buica, Luisa-Roxana Popescu (Mandoc), Alexandru Anton Ivanov & Eleonora-Mihaela Ungureanu

  2. Organic Chemistry Center “C.D. Nenitzescu”, Romanian Academy, Splaiul Independentei 202B, 71141, Bucharest, Romania

    Liviu Birzan

Authors
  1. George-Octavian Buica
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  2. Liviu Birzan
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  3. Luisa-Roxana Popescu (Mandoc)
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  4. Alexandru Anton Ivanov
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  5. Eleonora-Mihaela Ungureanu
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Correspondence to Eleonora-Mihaela Ungureanu.

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Buica, GO., Birzan, L., Popescu (Mandoc), LR. et al. Thermodynamics of interactions between lead(II) and cadmium(II) ions and azulene-based complexing polymer films. J Solid State Electrochem 20, 401–411 (2016). https://doi.org/10.1007/s10008-015-3055-9

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  • DOI: https://doi.org/10.1007/s10008-015-3055-9

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