Engineering Nanoscale Iron Oxides for Uranyl Sorption and Separation: Optimization of Particle Core Size and Bilayer Surface Coatings
2017
Herein, we describe engineered superparamagnetic
iron oxide nanoparticles(IONPs) as platform materials for enhanced
uranyl(UO22+) sorption and separation processes under environmentally relevant conditions. Specifically, monodispersed 8–25 nm
iron oxide(magnetite, Fe3O4) nanoparticles with tailored organic acid bilayered coatings have been systematically evaluated and optimized to bind, and thus remove, uranium from water. The combined nonhydrolytic synthesis and bilayer phase transfer material preparation methods yield highly uniform and surface tailorable IONPs, which allow for direct evaluation of the size-dependent and coating-dependent sorption capacities of IONPs. Optimized materials demonstrate ultrahigh sorption capacities (>50% by wt/wt) at pH 5.6 for 8 nm oleic acid (OA) bilayer and sodium monododecyl phosphate (SDP) surface-stabilized IONPs. Synchrotron-based
X-ray absorption spectroscopyshows that
iron oxidecore particle size and stabilizing surface functional group(s) substantially affec...
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