Skip to Main content Skip to Navigation
Journal articles

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

Abstract : 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
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-02526266
Contributor : Eva Fareau <>
Submitted on : Tuesday, March 31, 2020 - 2:45:07 PM
Last modification on : Wednesday, June 24, 2020 - 4:18:58 PM

Links full text

Identifiers

Citation

Eva Mazarío, Ahmed Helal, Jérémy Stemper, Alvaro Mayoral, Philippe Decorse, et al.. Maghemite nanoparticles bearing di(amidoxime) groups for the extraction of uranium from wastewaters. AIP Advances, American Institute of Physics- AIP Publishing LLC, 2016, 7 (5), pp.056702. ⟨10.1063/1.4973436⟩. ⟨insu-02526266⟩

Share

Metrics

Record views

28