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|Title:||Contrasting immobilization behavior of Cs+ and Sr2+ cations into a titanosilicate matrix|
|Authors:||PAVEL Cladiu; WALTER Marcus; POEML PHILIPP; BOUEXIERE Daniel; POPA Karin|
|Citation:||CHEMISTRY OF MATERIALS vol. 21 p. 3831–3837|
|Publisher:||AMER CHEMICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||ETS-10 titanosilicate was tested as an adsorbent for the removal of Cs+ and Sr2+ cations from radioactive waters considering both, the ion exchange and the behavior of the loaded adsorbent during thermal conditioning. The studies indicate that ETS -10 has a high and similar affinity for both Cs+ and Sr2+ cations reaching the IECETS-10 at a concentration of about 50 meq/L. Thermal treatment of Cs+- and Sr2+-exchanged ETS-10 materials results in melting at approximately 700°C. The temperature for the melting increases with the initial Cs+ and Sr2+ concentration and is higher for Sr 2+ than for Cs+ exchanged ETS-10. Recrystallization occurs only in the presence of Sr2+ as evidenced by the exothermic effects between 800 and 900 °C. After calcination of Cs+- and Sr2+-exchanged ETS-10 in air at 800 °C two types of materials were obtained: an amorphous glass material with homogeneous Cs+ distribution and a strontium fresnoites glass-ceramic material.|
|JRC Directorate:||Nuclear Safety and Security|
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