Studies on the hydrous niobium(V) oxide ion exchanger. I. A method for synthesis and some properties.
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概要
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A comprehensive study of the preparation of hydrous niobium(V) oxide ion exchangers was made using three kinds of niobium solutions: (1) HCl, (2) C<SUB>2</SUB>H<SUB>5</SUB>OH, and (3) H<SUB>2</SUB>SO<SUB>4</SUB>. From a detailed examination of the dependency of the yield, the ion-exchange behavior toward Na<SUP>+</SUP>, the chemical stability, and some other properties, regarding the method for precipitation, it was found that the pyrohydrolysis of the NbCl<SUB>5</SUB> solution was the best method, since the procedure was simple, rapid and reproducible, and the product had a comparatively good ion-exchange property. The product obtained from the H<SUB>2</SUB>SO<SUB>4</SUB> solution had the largest ion-exchange capacity and was most stable in highly alkaline solutions, but the whole procedure was very tedious. The exchanger prepared from the ethanolic solution had a smaller ion-exchange capacity in a pH region higher than 8. The materials, thus obtained, had at least two kinds of weakly dissociable ion-exchange sites, and the ion-exchange capacity for alkali metal ions decreased in the order of Li<SUP>+</SUP>>Na<SUP>+</SUP>>K<SUP>+</SUP>. The aging effect and the chemical stability were also examined.
- 公益社団法人 日本化学会の論文
著者
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Kimura Yasuyuki
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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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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