Abstract
The sorption of selenium(IV) ions on single crystals of natural shabazite, analcime, mesolite, stilbite, and on clinoptilolite- and mordenite-containing tuffs in dependence on the concentration and pH of a solution of sodium selenite was studied by infrared spectroscopy. It was assumed that sorption on clinoptilolite and mordenite tuffs from a 0.1 M solution of sodium selenite with pH 9 occurs in the form of selenite and pyroselenite anions forming a hydrogen bond with the zeolite water molecules. It was established that water molecules in analcime, unlike stilbite, shabazite and mesolite, also form hydrogen bonds with the selenite ion in an alkaline medium. No hydrogen bonds are formed in diluted solutions or an acid medium. The partial desilylation and dealumination of zeolites in alkaline and acid media respectively, were observed.
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