Textural and structural effects of heat treatment and γ-irradiation on Cs-exchanged NaX zeolite, bentonite and their mixtures

[Display omitted] ► NaX zeolite, Algerian bentonite, and their mixtures as getters of cesium. ► Heat treatment of both NaX and CsX zeolites up to 1000°C reveals new phases. ► Bentonite enables the partial amorphisation of the heat treated mixture zeolite–bentonite. ► Cs exchanged NaX zeolite improve...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2012-10, Vol.161, p.115-122
Main Authors: Belkhiri, S., Guerza, M., Chouikh, S., Boucheffa, Y., Mekhalif, Z., Delhalle, J., Colella, C.
Format: Article
Language:English
Subjects:
Bentonite
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Heat treatment
Ion-exchange
NaX zeolite
Porosity
Porous materials
Surface physical chemistry
Zeolites: preparations and properties
γ-Irradiation
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Summary:[Display omitted] ► NaX zeolite, Algerian bentonite, and their mixtures as getters of cesium. ► Heat treatment of both NaX and CsX zeolites up to 1000°C reveals new phases. ► Bentonite enables the partial amorphisation of the heat treated mixture zeolite–bentonite. ► Cs exchanged NaX zeolite improves resistance to γ-irradiation. NaX zeolite, Algerian bentonite, their mixtures, and their Cs-exchanged forms are subjected to heat treatment at different temperatures (800, 1000, and 1100°C) and γ-irradiation doses varying from 100 to 1000kGy. The effects of these treatments on structural and textural properties of the above materials as getters of radionuclides are studied using powder X-ray diffraction (XRD), nitrogen adsorption surface analyzer, and scanning electron microscopy (SEM). A thermal treatment of NaX and CsNaX zeolites up to 1000°C results in the formation of new crystalline phases (nepheline and carnegieite). In contrast, bentonite becomes totally amorphous when it is heat treated up to 800°C. Heat treating of zeolite–bentonite mixtures gives rise to partial amorphisation. γ-Irradiation of the studied materials reveals a good resistance of the Cs exchanged NaX zeolite. This is due to its higher basic character resulting from the Cs2O formed by the reaction between Cs+ present in the zeolite and the O2− anion liberated after γ-irradiation.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2012.05.027