New insights into the partitioning of phenothiazine dyes in aqueous two-phase systems.

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Autor(es): dc.creatorCoelho, Yara Luiza-
Autor(es): dc.creatorPatino Agudelo, Alvaro Javier-
Autor(es): dc.creatorFerreira, Guilherme Max Dias-
Autor(es): dc.creatorFerreira, Gabriel Max Dias-
Autor(es): dc.creatorCastro, Alan Stampini Benhame de-
Autor(es): dc.creatorHudson, Eliara Acipreste-
Autor(es): dc.creatorPires, Ana Clarissa dos Santos-
Autor(es): dc.creatorSilva, Luis Henrique Mendes da-
Data de aceite: dc.date.accessioned2025-08-21T15:26:39Z-
Data de disponibilização: dc.date.available2025-08-21T15:26:39Z-
Data de envio: dc.date.issued2021-12-14-
Data de envio: dc.date.issued2021-12-14-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/14241-
Fonte completa do material: dc.identifierhttps://doi.org/10.21577/0103-5053.20200056-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1014935-
Descrição: dc.descriptionAqueous 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsaberto-
Direitos: dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License. Fonte: o PDF do artigo.-
Palavras-chave: dc.subjectThermodynamic-
Palavras-chave: dc.subjectDriving force-
Título: dc.titleNew insights into the partitioning of phenothiazine dyes in aqueous two-phase systems.-
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