One-pot magnetic separation of uranium (U) in seawater and groundwater samples has been made possible by synthesizing phosphoramidate functionalized Ag coated citrate-FeO nanoparticles (NPs). The magnetic saturation value of these functionalized NPs is 27.1 emu g. The synergistic extraction mechanism of U(VI) ion by the surface-modified phosphoramidate and citrate molecules make these NPs highly selective towards U(VI). The adsorption kinetics follows a pseudo-second-order model and the adsorption isotherm fits successfully to the Langmuir adsorption model. The functionalized NPs show quantitative extraction efficiency in the pH range of 6.5-8 with a maximum loading capacity (Q) of 108.7 mg g. The equilibration time required by these functionalized NPs to attain the Q value is 120 s. The recycling of these NPs can be done up to 5-6 times with 1.0 mol L of NaCO or NHOH for quantitative extraction of U(VI). These functionalized NPs show high resilience towards large number of naturally abundant metal ions.
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| http://dx.doi.org/10.1016/j.talanta.2021.122372 | DOI Listing |
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