Isothermal Kinetic Investigation of the Water-Cations Interaction in Natural Clinoptilolite

Gianfranco Carotenuto
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Gianfranco Carotenuto: Institute for Polymers, Composites and Biomaterials - National Research Council

European Journal of Engineering and Technology Research, 2019, vol. 4, issue 5, 119-125

Abstract: The kinetics of water adsorption by a natural zeolite (clinoptilolite) sample has been investigated by high-frequency AC current intensity measurements. According to the achieved kinetic results, cations should play a relevant role in the clinoptilolite hydration, in fact most of adsorbed water stay in the cationic sites. The water molecules associate withcation one-by-one. In particular, the forced adsorption of water molecules in a wet atmosphere is a quite slow process, while water desorption in air or dry atmosphere is a spontaneous and fast process. The observed increase of cation mobility could be adequately explained by assuming an arrangement of water molecules between the cation and the negatively charged oxygens contained in the cationic site. Such molecular arrangement could increase the strength of both dipole-cation and hydrogen bond interactions.

Keywords: Natural zeolites; clinoptilolite; kinetics; hydration; dehydration; sensor (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:epw:ejeng0:v:4:y:2019:i:5:id:61341

DOI: 10.24018/ejeng.2019.4.5.1341

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