engleski

Chemical behavior of iron modified zeolite at different pH values of aquaeous solutions

The sample of natural zeolite originating from the Vranjska Banja deposit has been used in preparation of iron modified zeolite (IMZ), which has shown a significant increase of adsorption capacity towards heavy metal ions. This paper examines the chemical behavior of IMZ in the IMZ - ultrapure water system at different initial pH values in the range from 1.71 to 5.08. The results show that a rapid increase of pH is observed in the time interval up to 300 min in the pH range from 2.85 to 5.08. This can be attributed to the OH^- ions released during the process of exchange of H^+ ions from water with Na+ and other exchangeable cations from the zeolitic structure. At pH=1.71, the suspension pH was unchanged during 24 hours, when partial dissolution and degradation of the aluminosilicate structure have been observed.

iron modified zeolite ; clinoptilolite ; chemical behavior

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