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

作者：Mazario Eva; Helal Ahmed S; Stemper Jeremy; Mayoral Alvaro; Decorse Philippe; Chevillot Biraud Alexandre; Novak Sophie; Perruchot Christian; Lion Claude; Losno Remi; Le Gall Thierry; Ammar Souad; Chahine Jean Michel El Hage^*; Hemadi Miryana^*

来源：AIP Advances, 2017, 7(5): 056702.

DOI：10.1063/1.4973436

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: K-a = 10(5) 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 (q(max)) was determined. It indicates that MNP-dAMD is able to extract up to 120 mg of uranium per gram of sorbent. Spherical aberration (C-s)-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.

• 出版日期2017-5
• 单位中国地震局