Extraction of Dysprosium Ions with DTPA Functionalized Superparamagnetic Nanoparticles Probed by Energy Dispersive X-ray Fluorescence and TEM/High-Angle Annular Dark Field Imaging

Autor(es)

de Melo, Fernando Menegatti ^[1] ; Almeida, Sabrina da Nobrega ^[1] ; Uezu, Noemi Saori ^[1] ; Ospina Ramirez, Carlos Alberto ^[2] ; dos Santos, Antonio Domingues ^[3] ; Toma, Henrique Eisi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem, BR-05508000 Sao Paulo, SP - Brazil

^[2] Brazilian Nanotechnol Natl Lab, BR-13083970 Campinas, SP - Brazil

^[3] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Nanoscience and Nanotechnology; v. 18, n. 6, p. 4155-4159, JUN 2018.
• Citações Web of Science: 2

Resumo

The extraction of dysprosium (Dy3+) ions from aqueous solution was carried out successfully, using magnetite (Fe3O4) nanoparticles functionalized with diethylenetriaminepentaacetic acid (MagNP@DTPA). The process was monitored by energy dispersive X-ray fluorescence spectroscopy, as a function of concentration, proceeding according to a Langmuir isotherm with an equilibrium constant of 2 x 57x10(-3) g(MagNP) L-1 and a saturation limit of 63.2 mgDy/gMagNP. The presence of paramagnetic Dy3+ ions attached to the superparamagnetic nanoparticles led to an overall decrease of magnetization. By imaging the nanoparticles surface using scanning transmission electron microscopy equipped with high resolution elemental analysis, it was possible to probe the binding of the Dy3+ ions to DTPA, and to show their distribution in a region of negative magnetic field gradients. This finding is coherent with the observed decrease of magnetization, associated with the antiferromagnetic coupling between the lanthanide ions and the Fe3O4 core. (AU)

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