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Title: New insights into the partitioning of phenothiazine dyes in aqueous two-phase systems.
Authors: Coelho, Yara Luiza
Patino Agudelo, Alvaro Javier
Ferreira, Guilherme Max Dias
Ferreira, Gabriel Max Dias
Castro, Alan Stampini Benhame de
Hudson, Eliara Acipreste
Pires, Ana Clarissa dos Santos
Silva, Luis Henrique Mendes da
Keywords: Thermodynamic
Driving force
Issue Date: 2020
Citation: COELHO, Y. L. et al. New insights into the partitioning of phenothiazine dyes in aqueous two-phase systems. Journal of the Brazilian Chemical Society, v. 31, n. 8, p. 1700-1713, 2020. Disponível em: <>. Acesso em: 10 jun. 2021.
Abstract: Aqueous two-phase systems (ATPSs) have proven to be efficient and environmentally safe methods for extracting chemical species. However, the driving forces behind the partition of solutes in these systems are still little understood. A complete thermodynamic partitioning of phenothiazine dyes was investigated in poly(ethylene oxide) (PEO) + salt + water ATPSs. Standard transfer parameters (Gibbs free energy change (ΔtrGo ), enthalpy change (ΔtrHo ) and entropy change (TΔtrSo )) were evaluated, and their dependence on the dye structure, electrolyte nature and tie line length (TLL). All phenothiazine dyes are concentrated predominantly in the polymer enriched phase, with ΔtrGo values ranging from −4.1 up to −13.4 kJ mol−1. Due to the dye-PEO attractive interactions that occur mainly via benzene condensed ring present in the structures of phenothiazine dyes, the partitioning of these dyes was enthalpically driven, with −11.4 ≥ ΔtrHo ≥ −52 kJ mol−1 and −4.93 ≥ TΔtrSo ≥ −38 kJ mol−1.
ISSN: 1678-4790
metadata.dc.rights.license: This is an open-access article distributed under the terms of the Creative Commons Attribution License. Fonte: o PDF do artigo.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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