Zeolitised Materials of the Mediterranean Area as Adsorbents for Environmental Protection

An investigation on the adsorption properties of zeolite-rich rocks, coming from deposits located around the Mediterranean basin, has been carried out, in view of their possible utilisation in the field of environmental protection. Samples investigated contained chabazite, phillipsite, clinoptilolite, mordenite and faujasite and came from different formations in central Italy, north-eastern Greece and north-eastern Jordan.After a careful chemical and mineralogical characterisation of the samples, adsorption isotherms of H₂O, CO₂, SO₂ and NH₃ at 25 °C have been obtained.Experimental data have been processed according to the Langmuir, Freundlich and Dubinin-Astakhov theoretical models. Results have been interpreted considering an adsorption mechanism based on monomolecular layer coverage.