Studies of the hydrous silicon-titanium(IV) oxide ion exchanger. II. Affinity for various cations and thermal stability.
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概要
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The affiinity for various cations and the thermal stability were studied on hydrous silicon–titanium(IV) oxide ion exchangers with various titanium contents. An exchanger with 52 mol% Ti shows a higher affinity for an alkali metal ion having a smaller hydrated radius but similar affinity, which depends little on the pH′s of solutions, for alkaline earth metal ions, except for Ba<SUP>2+</SUP>. In the sorption of transition metal ions, the formation of a covalent bond is a factor in determining the selectivity of the exchanger, along with the remote coulombic interaction. The composition dependence of the affinities for Cs<SUP>+</SUP>, Ba<SUP>2+</SUP>, Co<SUP>2+</SUP>, Eu<SUP>3+</SUP>, and UO<SUB>2</SUB><SUP>2+</SUP> was explained in terms of the acid-base properties of the exchangers. The exchangers with 37 to 67 mol% Ti do not suffer from any drastic change in the surface area and in the crystallinity upon heating up to 540 °C, and are much more heat-resistant than the component simple hydrous metal oxides. The degree of the decrease in the exchange capacity upon heat treatment is larger in exchangers with a higher titanium content. The effect of a heat treatment on the acid-base property and the affinity for cations was also studied.
- 公益社団法人 日本化学会の論文
著者
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Yamazaki Hiromichi
Department Of Neurosurgery Yamanashi Prefectural Central Hospital
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Inoue Yasushi
Department of Applied Physics, Osaka University
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Kanno Yasuhito
Department of Nuclear Engineering, Faculty of Engineering, Tohoku University
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