Nanohydrometallurgical extraction of gold based on ranelate induced nanoparticles formation

Autor(es)

Mattioni, Joao V. ; Franciscato, Douglas S. ; Melo, Fernando M. ; Sihn, Luca M. ; Brandao, Bruno B. N. S. ; Condomitti, Ulisses ; Nakamura, Marcelo ; Toma, Henrique E.

• Tipo de documento: Artigo Científico
• Fonte: HYDROMETALLURGY; v. 213, p. 10-pg., 2022-07-06.

Resumo

Most known for its medicinal anti-osporotic properties, the ranelate ion exhibits an exceptional performance in reacting with gold(III) ions, generating stable gold nanoparticles (AuNP@Ran). The reaction proceeds rapidly at room temperature, under green, mild conditions. The AuNP@Ran nanoparticles are relatively inert in aqueous solution, and exhibit zeta potentials of about -50 mV at pH 6. This fact has been explored in this work for interacting with positively charged magnetite nanoparticles, leading to a novel magnetic nanohydrometallurgy method for the extraction of gold. The process has been investigated in detail, by monitoring the extraction and constructing the adsorption isotherms, using electronic and Raman spectroscopy. The nature of the nanoparticles association has been elucidated by exploring the SERS effect. The proposed method is able to extract even trace amounts of gold from aqueous solution. For its simplicity and safety, it can be a green alternative to most conventional gold extraction processes, without using harmful and toxic reagents, such as mercury and cyanide ions. (AU)

• Processo FAPESP: 19/14771-5 - Desenvolvimento de nanopartículas superparamagnéticas funcionalizadas com agentes complexantes para a captura e aproveitamento de metais estratégicos
• Beneficiário: João Victor Mattioni
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 18/21489-1 - Nanotecnologia supramolecular: design, materiais e dispositivos
• Beneficiário: Henrique Eisi Toma
• Modalidade de apoio: Auxílio à Pesquisa - Temático