Hydrothermal Synthesis of Sodium Zirconium Silicates and Characterization of Their Properties
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By studying reactions in the system Zr(OC3H7)4-silicic acid (Na2SiO3, Na2Si3O7)-NaOH-H2O under mild hydrothermal conditions (180-190°C) the formation of three novel layered sodium zirconium silicates, Na2Zr5Si2O15·3H2O, Na2Zr5Si2O15·4H2O, and Na2ZrSi3O9·3H2O, and five other compounds: Na4Zr2Si3O12, Na3HZrSi2O8, Na4Zr2Si5O16·H2O, Na4ZrSi3O10, and Na2ZrSi3O9·2H2O, have been found. All the synthesized materials were characterized by elemental analysis, TGA, X-ray, IR, and 29Si MAS NMR spectroscopy. The ion-exchange behavior of sodium zirconium silicates toward alkali, alkaline-earth, and some di- and trivalent metal cations was studied.
author list (cited authors)
Bortun, A. I., Bortun, L. N., & Clearfield, A.