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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Lanthanide ion processing from monazite based on magnetic nanohydrometallurgy

Texto completo
Autor(es):
Almeida, Sabrina da N. [1] ; Toma, Henrique E. [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim, Sao Paulo, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: HYDROMETALLURGY; v. 189, NOV 2019.
Citações Web of Science: 0
Resumo

A systematic work has been performed for the separation of the lanthanide elements from monazite mineral using magnetic nanohydrometallurgy. The process was based on DTPA (diethylenetriaminepentaacetic acid) functionalized Fe3O4 superparamagnetic nanoparticles as the active species for carrying out the magnetic extraction of the lanthanide ions in aqueous solution, at pH?6. The process was monitored by means of X-ray fluorescence (EDXRF) techniques, and the corresponding Langmuir isotherms were carefully elaborated, allowing to evaluate the equilibrium (affinity) constants involved. The results obtained for La3+, Pr3+, Nd3+, Sm3+, Gd3+ and Dy3+ ions followed the trends dictated by the lanthanide ion contraction. In the process, the elements are reversibly captured and released from the magnetically confined nanoparticles after applying a mild acid treatment (pH?2). Their chemical separation based on their relative affinity constants, can be performed by applying successive magnetic extraction/releasing cycles in aqueous solution, at room temperature, using the same reactor, dispensing the use of organic solvents and more intensive chemical processing. (AU)

Processo FAPESP: 13/24725-4 - Química supramolecular e nanotecnologia
Beneficiário:Henrique Eisi Toma
Modalidade de apoio: Auxílio à Pesquisa - Temático