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Synthesis, characterization and ion exchange properties of the framework sodium titanium germanate Na3H(TiO)3(GeO)(GeO4)3·7H2O

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Abstract

Sodium titanium germanate with a semicrystalline framework (STG) of the formula Na3H(TiO)3(GeO)(GeO4)3·7H2O was synthesized under mild hydrothermal conditions and its proton form, H4(TiO)3(GeO)(GeO4)3·8H2O (STG-H), was prepared by acid treatment of the sodium compound. The STG was characterized by elemental analysis, TGA, FT-IR, and X-ray powder diffraction. A comparative ion exchange examination of the STG-H towards alkali and alkaline earth metals in a broad pH and concentration range was carried out. It was found that the STG is a moderately weak cation exchanger, possessing high ion exchange capacity (up to 4.0 meq/g) and showing preference for heavy alkali and alkaline earth metals. The STG selectivity towards Cs+ and Sr2+ ions in the presence of competitive metal ions and certain organic compounds was also studied. The data obtained suggest that the sodium titanium germanate is a more selective exchanger for Sr2+ ion than its titanium silicate analogue, K3H(TiO)4(SiO4)3·4H2O.

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Authors and Affiliations

  1. Institute for Sorption & Problems of Endoecology, Naumov Str. 13, 252164, Kiev, Ukraine

    A. M. Puziy

  2. Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, 33071, Oviedo, Spain

    J. R. García

Authors
  1. A. M. Puziy
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  2. J. R. García
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Puziy, A.M., García, J.R. Synthesis, characterization and ion exchange properties of the framework sodium titanium germanate Na3H(TiO)3(GeO)(GeO4)3·7H2O. J Radioanal Nucl Chem 240, 851–857 (1999). https://doi.org/10.1007/BF02349862

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  • DOI: https://doi.org/10.1007/BF02349862

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