Ion-exchange properties and thermal stability of hydrous titanium(VI)-zirconium(IV) oxide ion exchanger.
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概要
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Ion-exchange properties and thermal stability were studied for hydrous Ti<SUP>IV</SUP>–Zr<SUP>IV</SUP> oxide ion exchangers with various contents of titanium. The cation-exchange capacity increased with the titanium content in the exchanger, along with a decrease in the anion-exchange capacity. Though the affinity for representative metal ions increases with the acidity of the exchange sites, no such simple relation holds for transition metal ions. Exchangers with 30 to 70 mol% Ti (the mol% of Ti to Ti+Zr) do not suffer from drastic changes in both the water content and crystallinity upon heating to 500°C; they are much more heat-resistant than component simple hydrous metal oxides. Though the total cation-exchange capacity decreases with increasing temperature during a heat treatment, only a minute amount of the acidic sites dissociating at a pH lower than the isoelectric point of the exchangers with <I>≤</I>70 mol% Ti increases upon heating. The effect of a heat treatment on the distribution coefficients of cations has been explained by these observations.
- 公益社団法人 日本化学会の論文
著者
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Kikuchi Naoki
Department Of Food Science And Technology Tokyo University Of Fisheries
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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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Kurihara Hiroshi
Department of Nuclear Engineering, Faculty of Engineering, Tohoku University
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