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- Title
Thermodynamics of interactions between lead(II) and cadmium(II) ions and azulene-based complexing polymer films.
- Authors
Buica, George-Octavian; Birzan, Liviu; Popescu (Mandoc), Luisa-Roxana; Ivanov, Alexandru; Ungureanu, Eleonora-Mihaela
- 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. Poly L 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 poly L 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 poly L film. Thermodynamic parameters for the chemical sorption of lead(II) and cadmium(II) ions within poly L films have been calculated.
- Subjects
LEAD; CADMIUM; THERMODYNAMICS; AZULENE; POLYMER films; SORPTION
- Publication
Journal of Solid State Electrochemistry, 2016, Vol 20, Issue 2, p401
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-015-3055-9