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- Title
Mechanism of Formation of Chabazite-K by Fusion of Fly Ash with KOH Followed by Hydrothermal Reaction and Its Cs<sup>+</sup> Sorption Properties.
- Authors
Raghavendra, Y.; Bera, Santanu; Srinivasan, M. P.; Rangarajan, S.
- Abstract
Chabazite-K was synthesized from coal fly ash by a two-stage hydrothermal process. Fly ash was fused with KOH and colloidal SiO2, and the resulting material was characterized by x-ray diffraction (XRD) analysis and Raman spectroscopy. The role of KOH in the nucleation of chabazite is explained in terms of uniform incorporation of Al and Si tetrahedra in aluminosilicate rings at the fusion stage. Cocrystallization of phillipsite with chabazite led to the formation of phillipsite–chabazite combined phase along with chabazite-K. The Cs+ sorption capacity of the material was found to be 299 ± 8 mg/g with selectivity for Cs+. Under the same experimental conditions, fusion of fly ash in NaOH led to formation of sodalite, which can be explained in terms of preferential incorporation of Al tetrahedra in aluminosilicate rings at the fusion stage of synthesis.
- Subjects
FLY ash; COAL ash; CESIUM; CHABAZITE; RAMAN spectroscopy; SODALITE; SORPTION
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2021, Vol 73, Issue 7, p2111
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-021-04594-1