A solidification–stabilization procedure aiming at immobilizing Cs+ and Sr2+, two of the radioactive species more frequently present in nuclear power plant wastewaters, was successfully tested. Both cations were simultaneously exchanged by a blend of two zeolites, a phillipsite-rich tuff, selective for Cs+, and a synthetic zeolite Linde-type A, selective for Sr2+. The contaminated material was then heat treated up to 1200 °C with the result of safely immobilizing both cations, as demonstrated by leaching estimation with three different procedures. X-ray studies of the single cation-loaded zeolites or mixture of them helped to interpret the immobilization mechanism, involving cation trapping in chemically stable crystalline/amorphous matrices formed as a result of firing.
Entrapping of Cs and Sr in heat-treated zeolite matrices / Liguori, Barbara; Caputo, Domenico; Iucolano, Fabio; Aprea, Paolo; DE GENNARO, Bruno. - In: JOURNAL OF NUCLEAR MATERIALS. - ISSN 0022-3115. - 435:1-3(2013), pp. 196-201. [10.1016/j.jnucmat.2012.12.043]
Entrapping of Cs and Sr in heat-treated zeolite matrices
LIGUORI, BARBARA;CAPUTO, DOMENICO;IUCOLANO, FABIO;APREA, PAOLO;DE GENNARO, BRUNO
2013
Abstract
A solidification–stabilization procedure aiming at immobilizing Cs+ and Sr2+, two of the radioactive species more frequently present in nuclear power plant wastewaters, was successfully tested. Both cations were simultaneously exchanged by a blend of two zeolites, a phillipsite-rich tuff, selective for Cs+, and a synthetic zeolite Linde-type A, selective for Sr2+. The contaminated material was then heat treated up to 1200 °C with the result of safely immobilizing both cations, as demonstrated by leaching estimation with three different procedures. X-ray studies of the single cation-loaded zeolites or mixture of them helped to interpret the immobilization mechanism, involving cation trapping in chemically stable crystalline/amorphous matrices formed as a result of firing.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
