SYNTHESIS AND CHARACTERIZATION OF A NOVEL LAYERED SODIUM TITANIUM SILICATE Na₂TiSi₂O₇ 2H₂O.

ABSTRACT

A novel layered sodium titanium silicate Na₂TiSi₂O₇ 2H₂O has been synthesized by the reaction of a titanium-hydrogen peroxide complex and silicic acid in alkaline media under mild hydrothermal conditions (200°C). The product was characterized by elemental analysis. TGA, FT-IR. MAS ²⁹Si and ²³Na NMR and X-ray spectroscopy. The intercalation reaction of n-alkylamines from the gaseous phase and the ion exchange behavior of Na₂TiSi₂O₇ 2H₂O towards alkali, alkaline earth and some transition metal ions in model individual and complex solutions were studied. It was found that the layered sodium titanium silicate contains acidic hydroxyl functional groups, which results in cation uptake at pH>1.5. The high affinity of the exchanger for cesium in weakly acid and neutral solutions makes it a promising material for the treatment of some types of nuclear wastes, contaminated ground water and different biological liquors.

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Notes on contributors

Anatoly I. Bortun

On leave from the Institute for Sorption and Problems of Endoecology of the National Academy of Sciences, 32/34 Palladina Prospect, Kiev 252142, UKRAINE

Lyudmila N. Bortun

On leave from the Institute for Sorption and Problems of Endoecology of the National Academy of Sciences, 32/34 Palladina Prospect, Kiev 252142, UKRAINE