Maghemite nanoparticles bearing di(amidoxime) groups for the extraction of uranium from wastewaters

Mazario, E. ; Helal, A.S. ; Stemper, J. ; Mayoral, A. ; Decorse, P. ; Chevillot-Biraud, A. ; Novak, S. ; Perruchot, C. ; Lion, C. ; Losno, R. ; Le Gall, T. ; Ammar, S. ; El Hage Chahine, J.M. ; Hémadi, M.

Resumen: Polyamidoximes (pAMD) are known to have strong affinities for uranyl cations. Grafting pAMD onto the surface of functionalized maghemite nanoparticles (MNP) leads to a nanomaterial with high capacities in the extraction of uranium from wastewaters by magnetic sedimentation. A diamidoxime (dAMD) specifically synthesized for this purpose showed a strong affinity for uranyl: Ka = 105 M-1 as determined by Isothermal Titration Calorimetry (nano-ITC). The dAMD was grafted onto the surface of MNP and the obtained sorbent (MNP-dAMD) was characterized. The nanohybrids were afterward incubated with different concentrations of uranyl and the solid phase recovered by magnetic separation. This latter was characterized by zeta-potential measurements, X-Ray Photoelectron Spectroscopy (XPS) and X-Ray Fluorescence spectroscopy (XRF), whereas the supernatant was analyzed by Inductively Coupled Plasma coupled to Mass Spectrometry (ICP-MS). All the data fitted the models of Langmuir, Freundlich and Temkin isotherms very well. These isotherms allowed us to evaluate the efficiency of the adsorption of uranium by MNP-dAMD. The saturation sorption capacity (qmax) was determined. It indicates that MNP-dAMD is able to extract up to 120 mg of uranium per gram of sorbent. Spherical aberration (Cs)-corrected High-Resolution Scanning Transmission Electron Microscopy (HRSTEM) confirmed these results and clearly showed that uranium is confined at the surface of the sorbent. Thus, MNP-dAMD presents a strong potential for the extraction of uranium from wastewaters.

Idioma: Inglés

DOI: 10.1063/1.4973436

Año: 2017

Publicado en: AIP advances 7 (2017), 056702 [7 pp.]
ISSN: 2158-3226

Factor impacto JCR: 1.653 (2017)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 174 / 285 = 0.611 (2017) - Q3 - T2
Categ. JCR: PHYSICS, APPLIED rank: 81 / 146 = 0.555 (2017) - Q3 - T2
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 69 / 92 = 0.75 (2017) - Q3 - T3

Factor impacto SCIMAGO: 0.472 - Physics and Astronomy (miscellaneous) (Q2) - Nanoscience and Nanotechnology (Q2)

Tipo y forma: Artículo (Versión definitiva)