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  • 1 Comenius University Faculty of Natural Sciences Bratislava Slovak Republic
  • | 2 Slovak Technical University Faculty of Chemical Technology Bratislava Slovak Republic
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The paper presents a fundamental study of adsorption equilibria for aqueous solutions of iron(III) chloride with natural and Na+-converted indigeneous and Chinese clinoptilolites. Adsorption isotherms for systems studied at ambient as well as elevated temperatures were measured. In order to evaluate the process enthalpy a plot of logK versus 1/T was drawn.