Crystal Structures of Cobalt-Exchanged Sodium GTS-type Titanosilicates and the Elution Test by Acid Solution

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  • Fujiwara K.
    Graduate School of Science and Engineering,Yamaguchi Univ.
  • Tamaki T.
    Graduate School of Science and Engineering,Yamaguchi Univ.
  • Kishimori C.
    Graduate School of Science and Engineering,Yamaguchi Univ.
  • Titorenkova R.
    Graduate School of Science and Engineering,Yamaguchi Univ.
  • Nakatsuka A.
    Graduate School of Science and Engineering,Yamaguchi Univ.
  • Nakayama N.
    Graduate School of Science and Engineering,Yamaguchi Univ.

抄録

Fine particles of Na-GTS have been prepared by using hydrothermal method. Co2+-exchanged GTS were obtained by shaking 0.5 g of the single-phase Na-GTS sample in the aqueous solutions of CoCl2 (25 mL, 0.025～1.0 M) at 40℃ for 24 hours. Samples with the composition 0.23 ≤ x ≤ 0.9 in the formula of Na4-4xCo2xTi4Si3O16 were obtained. With the increase of Co composition x, the rhombohedral lattice parameter a increases and α becomes close to 90°. The Co elution ratios were about 90 % for the samples with x = 0.23 and 0.56, whereas 70% for the samples of ion exchange ratio with x = 0.88. By Co2+ exchange, the water content increased from 20.5 to 24.5 % and the DTA peak temperature due to the dehydration was lowered from 253 to 230℃. FT-IR spectra showed apparent change in the absorption peaks due to the O-H stretching in the range of 3000～3600 cm-1 suggesting some change in the hydration state.

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