| Texto completo | |
| Autor(es): |
Neves, Heyder Pereira
;
Silva, Lucas Andrade
;
Prates, Leticia Maia
;
Pereira, Alexandre Moni
;
Miranda, Victoria Souza da Silva
;
Correia, Julio Cesar Guedes
;
Ferreira, Gabriel Max Dias
;
Patino-Agudelo, Alvaro Javier
;
Leao, Versiane Albis
;
Mageste, Aparecida Barbosa
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CHEMICAL ENGINEERING JOURNAL; v. 502, p. 14-pg., 2024-12-03. |
| Resumo | |
Aqueous two-phase systems (ATPSs) have been proposed as an alternative liquid-liquid extraction technique applicable for the separation of economically valuable metals. However, gaps in knowledge and the need for a deeper understanding of the mechanisms involved in metal extraction still hinder the widespread adoption of these systems. In this study, ATPSs formed by TX-100 and electrolytes were employed to separate La, Pr, and Nd from Al and Fe. Use of an ATPS composed of TX-100, NH4SCN, and water, at pH 2.00, with a phase ratio of 1:5, resulted in total extraction of Al and Fe, although there was also considerable co-extraction of REEs. When a phase ratio of 1:2 was used for an ATPS composed of TX-100, (NH4)2SO4, and water, with NH4SCN as extractant, at pH 1.00, it was possible to separate Fe from the other metals, with significantly lower co-extraction of REEs and Al (%ELa = 4.05 %, %EPr = 6.19 %, %ENd = 4.87 %, %EFe = 98.61 %, %EAl = 2.54 %). The results of density functional theory (DFT) calculations correlated well with the experimental metal extraction data, demonstrating that the characteristics and solvation of the complexes formed in the ATPS played a fundamental role in metal partitioning. Measurements of the physical properties of the ATPS phases revealed variations in viscosity and interfacial tension values, which could assist in developing applications on a larger scale. The findings demonstrated that ATPSs could be used to separate REEs from transition metals, with potential applications in the recovery of REEs present in secondary sources. (AU) | |
| Processo FAPESP: | 23/11091-9 - Modelagem termodinâmica da formação de micelas gigantes |
| Beneficiário: | Álvaro Javier Patiño Agudelo |
| Modalidade de apoio: | Bolsas no Brasil - Programa Fixação de Jovens Doutores |