| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Ceramics in the Nuclear Fuel Cycle
|
| Presentation Title |
Multi-scale Cs Sorbents Easily Transformable into Waste Confinement Matrices |
| Author(s) |
Agnes Grandjean, Micheal Maloney, Clément Cabaud, N. Massoni, Scott Misture |
| On-Site Speaker (Planned) |
Scott Misture |
| Abstract Scope |
We demonstrate multimodal materials with the ability to selectively entrap Cs+ from a radioactive multi-ion liquid phase, after which they are easily transformable into the final waste form using a simple thermal treatment. we focus on K-containing copper (II) hexacyanoferrate (II) nanoparticles. Selectivity to Cs ions was studied, and we show that insertion of Cs+ into the structure leads to a weakening of the local bonds and a decrease in Jahn-Teller distortions around the metal centers. By anchoring the HCF sorption centers into porous silica, it become feasible to directly calcine (no additives) Cu-HCF functionalized silica after Cs-exchange at 1000°C without Cs loss. We attribute this desirable performance to in-situ formation of an alkali silicate glass zone that that immobilize by-products of decomposed HCF (Cs, K, Cu, Fe ) and Si coming from the siliceous matrix. |