Contrasting immobilization behavior of Cs+ and Sr2+ cations into a titanosilicate matrix

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.

PAVEL Cladiu;  WALTER Marcus;  POEML Philipp;  BOUEXIERE Daniel;  POPA Karin; 

2011-06-14

AMER CHEMICAL SOC

JRC60646

0897-4756,   

http://pubs.rsc.org/en/content/articlelanding/2011/jm/c0jm03135f/unauth,    https://publications.jrc.ec.europa.eu/repository/handle/JRC60646,   

10.1039/C0JM03135F,