The main objective of this project is development of a novel composite material, which application after CBRN incidents can bind hazardous isotopes of caesium and reduce risk of radioactive contamination on the incident site.
At present time, development of materials that can absorb caesium selectively in the presence of sodium and potassium is a challenging problem. While other radionuclides, e.g., 60Co or 90Sr, can be separated easily due to their ability to form insoluble products with many anions, most of compounds of 137Cs are soluble and, therefore, highly mobile in aqueous media. In addition, concentration of radioactive caesium is much lower than naturally present sodium and potassium that favors their preferable adsorption.
Our novel approach to the synthesis of highly selective adsorbents for caesium is formation of specific adsorption sites for selective Cs+ uptake in a mesoporous material with high surface area. As the adsorption sites, heteropolyacids H3PW12O40 and H3PMo12O40 will be incorporated into ordered structure of porous silica.
The project is based on the hypothesis that tungstophosphate- and molybdophosphate-containing porous composite materials can selectively adsorb 137Cs from contaminated site..
The specific aims of the project are:
1. Synthesis of mesoporous composite materials;
2. Characterization of the adsorbents;
3. Study of Cs adsorption on obtained materials;
4. Development of a formulation of the most efficient adsorbent for pilot-scale manufacture