Coelho, Yara LuizaPatino Agudelo, Alvaro JavierFerreira, Guilherme Max DiasFerreira, Gabriel Max DiasCastro, Alan Stampini Benhame deHudson, Eliara AciprestePires, Ana Clarissa dos SantosSilva, Luis Henrique Mendes da2021-12-152021-12-152020COELHO, 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: <https://www.scielo.br/j/jbchs/a/N7gGwQgQQ9fXKwTwy4s9Kyc/abstract/?lang=en&format=html>. Acesso em: 10 jun. 2021.1678-4790http://www.repositorio.ufop.br/jspui/handle/123456789/14241Aqueous 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.en-USabertoThermodynamicDriving forceArtigo publicado em periodicoThis is an open-access article distributed under the terms of the Creative Commons Attribution License. Fonte: o PDF do artigo.https://doi.org/10.21577/0103-5053.20200056