Résumé
Lliquid outflows contaminated with radionuclides, either coming from spent reprocessing fuel plants or from accidental cases such as Fukushima Daiichi, have to be treated. Radionuclides soprtion on solid substrate is very attractive due to the immobilization of radiative compounds on a solid phase that can be added in a second step in conditioning matrices such as glass, cement or bitumen. However, since a couple of years alternative processes avoiding the second step are under investigation, especially for volatile radionuclides such as Cesium or Iodine. One of these alternative processes is to consider the substrate used for the decontamination step as a conditioning matrice through quite simple treatment. These last years, the ICSM has developed several kinds of hierarchical porous silica, functionalized in order to selectively uptake radionuclides with for example the selective sorption of Cs towards Na. The benefits of confining radionuclides in pores comes from the fact that these substrates can be densified quite easily (moderate heating, pressure or irradiation). This talk will give you an overview of the synthesis routes developed to design these materials (post functionnalization of existing porous glass beads, emulsion templated monoliths, nanoparticles…) and the first studies undertaken to densify these porous materials and make it promising solutions for « all-in-one » separation/conditioning process.