Elaboration and characterization of solid materials of types zeolite NaA and faujasite NaY exchanged by zinc metallic ions Zn2

• Published in: Physics procedia Vol. 2; no. 3; pp. 1433 - 1440
• Main Authors: Nibou, D., Amokrane, S., Mekatel, H., Lebaili, N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2009
• Subjects: Faujasite NaY; Ion exchange; Sodalite NaA; Zeolite materials; Zinc metallic ions; Faujasite NaY; Zeolite materials; Zinc metallic ions; Sodalite NaA; Ion exchange
• ISSN: 1875-3892; 1875-3892
• DOI: 10.1016/j.phpro.2009.11.113

The present work deals with the elaborated of NaA and faujasite NaY solid materials according to a hydrothermal crystallization of amorphous gels composed of solutions of silicon, aluminum and sodium. The process elaboration has been achieved in autoclaves made of steel lined in Teflon under different operating conditions of temperature of heating, time of contact and stirring. After crystallization, the samples were characterized by different techniques such as X ray diffraction, scanning electronic microscopy, infrared spectroscopy, thermal analysis, and chemical analysis. Pure solid materials NaA and NaY zeolites were obtained and were impregnated by (Zn2+) ions by ion exchange process. The effects of various parameters such as initial metal concentration, pH, solid-liquid ratio (R) and temperature on the exchange percentage are studied. The equilibrium isotherms of zinc ions sorption are also evaluated using Langmuir and Freundlich models. Thermodynamic parameters, i.e. enthalpy of adsorption ΔHads∘, entropy change ΔSads∘ and Gibbs free energy ΔGads∘ for the sorption of zinc ions on NaA and NaY zeolites were examined.