Synthesis of chabazite and merlinoite for Cs+ adsorption and immobilization properties by heat-treatment
Abstract
The single phase of the chabazite (CHA) was artificially synthesized in the absence of organic-structure-directing agents and a seed crystal. The CHA showed a high selectivity of 91.2% for Cs ions in sea water (1.0 g CHA in 100 ppm Cs containing 100 mL sea water), which was superior to 87.1% of the synthesized mordenite. The single phase of the merlinoite (MER) was obtained by lack of a fluoride source. The Cs adsorption performance for the MER was 83.1% in the seawater. The CHA was heat-treated for the immobilization of the Cs in the decomposed zeolite. For the non-heated sample, ca. 1.2% Cs ion from all of the adsorbed Cs was eluted by a dissolution test in deionized water for 14 days. The Cs ion did not elute when the sample was heated at 1000 °C and higher temperature due to the Cs containment in the amorphous phase.
- Publication:
-
Solid State Sciences
- Pub Date:
- February 2020
- DOI:
- 10.1016/j.solidstatesciences.2019.106094
- Bibcode:
- 2020SSSci.10006094A
- Keywords:
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- Chabazite;
- Merlinoite;
- Cs decontamination;
- Immobilization;
- Heat treatment