Technetium retention by gamma alumina nanoparticles and the effect of sorbed Fe2
作者： Natalia Mayordomo , Diana M. Rodríguez , Dieter Schild , Konrad Molodtsov , Erik V. Johnstone
DOI: 10.1016/J.JHAZMAT.2020.122066
关键词:
摘要: Abstract Technetium (Tc) retention on gamma alumina nanoparticles (γ-Al2O3 NPs) has been studied in the absence (binary system) and presence (ternary of previously sorbed Fe2+ as a reducing agent. In binary system, γ-Al2O3 NPs sorb up to 6.5% Tc from solution Tc(VII). ternary significantly enhances uptake pH 4 11. Under these conditions, reaction rate increases with pH, resulting complete for pHs > 6.5. Redox potential (Eh) X-ray photoelectron spectroscopy (XPS) measurements evince heterogeneous reduction Tc(VII) Tc(IV). Here, formation Fe-containing solids was observed; Raman scanning electron microscopy showed Fe(OH)2, Fe(II)-Al(III)-Cl layered double hydroxide (LDH), other Fe(II) Fe(III) mineral phases, e.g. Fe3O4, FeOOH, Fe2O3. These results indicate that scavenging is predominantly governed by species NPs, where Tc(IV) overall highly improved, even under acidic conditions. Likewise, additional Fe solid phases system promotes via adsorption, co-precipitation, incorporation mechanisms.
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