Na+/H+ Ion-exchange process on layered hydrous titanium dioxide.
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概要
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The Na<SUP>+</SUP>/H<SUP>+</SUP> ion-exchange on layered hydrous titanium dioxide, H<SUB>2</SUB>Ti<SUB>4</SUB>O<SUB>9</SUB>·1.2–1.3H<SUB>2</SUB>O, has been studied from chemical and structural aspects. The ion-exchange reaction proceeded stepwise through two stages [0–50%, 50–72% conversion]. In stage I a discontinuous change in interlayer distance took place and the 1/2-exchanged phase with a widened interlayer distance appeared. The exchange in stage II proceeded <I>via</I> a solid solution and resulted in the 3/4-exchanged phase. The variation in unit cell dimensions indicates that these partially exchanged phases were formed by swelling the spacing of adjacent [Ti<SUB>4</SUB>O<SUB>9</SUB><SUP>2−</SUP>]<I><SUB>n</SUB></I> sheets. The structural and the thermoanalytical data can be interpreted on the basis of the structural model in which sodium ions and water molecules are arranged in a double row in the interlayer region.
- 公益社団法人 日本化学会の論文
著者
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FUJIKI Yoshinori
National Institute for Research in Inorganic Materials
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Watanabe Mamoru
National Institute For Reseach In Inorganic Materials
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Sasaki Takayoshi
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
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- Na+/H+ Ion-exchange process on layered hydrous titanium dioxide.