Extraction of radioactive cesium using innovative functionalized porous materials
2012
Delchet, Carole | Tokarev, Alexei | Dumail, Xavier | Toquer, Guillaume | Barré, Yves | Guari, Yannick | Guérin, Christian | Larionova, Joulia | Grandjean, Agnès
A new approach to an efficient and selective extraction of Cs⁺ ions from water, sea water enriched with Cs⁺ and a radioactive solution simulating the effluents of the Fukushima reactors (¹³⁷Cs, 29 kBq L⁻¹) was developed by using porous silica- or glass-based nanocomposites containing Prussian blue type nanoparticles, Co²⁺/[Fe(CN)₆]³⁻, with sizes below 10 nm. A particular emphasis is given on the kinetics of cesium sorption fitted by using the classical reaction order model as well as a diffusion model in order to better understand the sorption mechanism. Compared to the amount of Co²⁺/[Fe(CN)₆]³⁻ nanoparticles, the sorption capacities of studied nanocomposites are more than three times higher than the ones observed for the respective bulk materials. These nanocomposites present a high selectivity to Cs⁺ and extract it in trace amounts.
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