SYNTHESIS AND CHARACTERIZATION OF A NOVEL LAYERED SODIUM TITANIUM SILICATE NA2TISI2O7-CENTER-DOT-2H(2)O

A novel layered sodium titanium silicate Na2TiSi2O7 . 2H(2)O has been synthesized by the reaction of a titanium-hydrogen peroxide complex an d silicic acid in alkaline media under mild hydrothermal conditions (2 00 degrees C). The product was characterized by elemental analysis, TG A, FT-IR, MAS(29)Si and Na-23 NMR and X-ray spectroscopy. The intercal ation reaction of n-alkylamines from the gaseous phase and the ion exc hange behavior of Na2TiSi2O7 . 2H(2)O towards alkali, alkaline earth a nd some transition metal ions in model individual and complex solution s were studied. It was found that the layered sodium titanium silicate contains acidic hydroxyl functional groups, which results in cation u ptake at pH>1.5. The high affinity of the exchanger for cesium in weak ly acid and neutral solutions makes it a promising material for the tr eatment of some types of nuclear wastes, contaminated ground water and different biological liquors.