Abstract
The selective removal and fixation of Cs and Sr have been studied in zeolite A and chabazite. Cesium ion was preferentially distributed into chabazite with a high distribution coefficient (KCS>103 cm3 g–1) in the presence of NaCl (10–1 mol dm–3). The KSr values for zeolite A attained about 103 cm3 g–1 in the pH range of 8˜10, and they gradually decreased with an decrease in pH. The initial rate of Cs adsorption was fairly fast in chabazite, and the adsorption ratio reached almost 100% within a few hours. The adsorption ratio of Sr in binderless A zeolite reached almost 100% after 15 h. The adsorption of Cs and Sr on these zeolites was followed by Langmuir-type isotherm. Cesium forms of these zeolites recrystallized to pollucite (CsAISi2O6) above 900°C for zeolite A and above 1,200°C for chabazite. As for Sr forms, these zeolites changed to SrAl2Si2O8 above 900°C. These recrystallized phases were suitable hosts for the immobilization of Cs and Sr in the nuclear waste solutions.
| Original language | English |
|---|---|
| Pages (from-to) | 284-291 |
| Number of pages | 8 |
| Journal | journal of nuclear science and technology |
| Volume | 22 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1985 Apr |
Keywords
- Adsorption rate. Langmuir-type isotherm
- Cesium
- Chabazite
- Distribution
- Fixation
- Immobilization
- PH value
- Pollucite
- Strontium
- Strontium aluminum silicate
- Zeolite A
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering