Intermediate-silica sedimentary chabazite contained in two chabazite-rich tuffaceous rocks has been evaluated as potential cation exchanger for radioactive cation removal from nuclear waste streams. Exchange isotherms have been obtained for the cationic couples Na/Ba, Na/Co, Na/Cs and Na/Sr and the relevant thermodynamic parameters calculated with the help of a computer program. Sedimentary chabazite turns out very selective for Cs+, fairly selective for Ba2+ and Sr2+, especially at low equivalent fraction of these cations in solution, and unselective for Co2+. An explanation of the observed selectivities is attempted on the basis of the structural features of chabazite.
Evaluation of an intermediate-silica sedimentary chabazite as exchanger for radioactive cations / DE GENNARO, Bruno; Colella, Abner; Aprea, Paolo; Colella, Carmine. - In: MICROPOROUS AND MESOPOROUS MATERIALS. - ISSN 1387-1811. - STAMPA. - 61:1-3(2003), pp. 159-165. [10.1016/S1387-1811(03)00363-9]
Evaluation of an intermediate-silica sedimentary chabazite as exchanger for radioactive cations
DE GENNARO, BRUNO;COLELLA, ABNER;APREA, PAOLO;COLELLA, CARMINE
2003
Abstract
Intermediate-silica sedimentary chabazite contained in two chabazite-rich tuffaceous rocks has been evaluated as potential cation exchanger for radioactive cation removal from nuclear waste streams. Exchange isotherms have been obtained for the cationic couples Na/Ba, Na/Co, Na/Cs and Na/Sr and the relevant thermodynamic parameters calculated with the help of a computer program. Sedimentary chabazite turns out very selective for Cs+, fairly selective for Ba2+ and Sr2+, especially at low equivalent fraction of these cations in solution, and unselective for Co2+. An explanation of the observed selectivities is attempted on the basis of the structural features of chabazite.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
