Abstract
Ag- and Zn-exchanged A zeolites are prepared by the liquid ion exchange method following the procedure reported in our previous studies. Samples with Ag and Zn metal loadings are obtained and characterized by physicochemical and thermal analyses. The obtained materials with improved physicochemical properties are promising candidates for use as haemostatic agents. Both powder X-ray diffraction and nitrogen adsorption measurements show good conservation of the zeolitic structure and texture after ionic exchange. Porosity measurements indicate that the variation of the porous volumes and the specific surface areas depends on the number and nature of exchanged cations. Thermal behavior of water adsorption studied by using TGA microbalance and differential scanning calorimetry highlights clearly the complexity of the adsorption and diffusion mechanisms of water molecules within the micropores of exchanged zeolites. The differences between sorption rates and hydration heats appear to be due mainly to the location and migration of Ag, Ca and Zn species in the cationic position of the A zeolite framework. The exothermicity of adsorption is attenuated by Ag and Zn exchange.
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