4.5 Article

Magnetic behavior of superparamagnetic nanoparticles containing chelated transition metal ions

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DOI: 10.1016/j.jmmm.2019.165324

Keywords

Magnetophoresis; Superparamagnetic nanoparticles; Magnetite; Nanohydrometallurgy; External weighing

Funding

  1. FAPESP (Fundacao de Apoio Pesquisa no Estado de Sao Paulo) [2013/24725-4]
  2. CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [405301/2013-8]

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Superparamagnetic nanoparticles functionalized with diethylenetriaminepentaacetic acid (MagNP@DTPA) have been employed for extracting and processing strategic metal ions in nanohydrometallurgy. In order to probe the metal ion capture from aqueous solution in real time, an external weighing device has been adapted for a conventional analytical balance, allowing to measure the nanoparticles attraction by a miniature neodymium (Nd2Fe14B) supermagnet. The magnetic migration kinetics, also referred as magnetophoresis, has been probed in this way, as well as the evaluation of the magnetic interaction of the Fe3O4 core with the attached paramagnetic metal ions. The results indicated some correlation between the overall nanoparticle magnetic moments and their magnetophoretic rates. An additive magnetic response was observed for the metallated nanoparticles in dry form, using VSM. However, in solution, the global magnetization decreased with the magnetic moment of the attached metal ions. Presumably, there is an influence of dipolar and superexchange interactions mediated by the metal-ligand structures, including the formation of carboxylate bridges between the outer paramagnetic centers in the dry form.

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