Synthetic inorganic ion-exchange materials. XXXVIII. Acid-base properties of a cryptomelane-type hydrous manganese(IV) oxide and some chromatographic applications.
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概要
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The pH titration curves of a cryptomelane-type hydrous manganese(IV) oxide(CRYMO) apparently showed a dibasic Brönsted-acid towards Li<SUP>+</SUP>, Na<SUP>+</SUP>, K<SUP>+</SUP>, and Rb<SUP>+</SUP> ions and a monobasic Brönsted-acid towards Cs<SUP>+</SUP> ions, instead of an amphoteric character, using a mixed solution of alkali metal nitrate and nitric acid or each hydroxide with the ionic strength of 0.1. The apparent ion-exchange capacities(meq/g) of alkali metal ions increased in this order: Li<SUP>+</SUP>(0.50)<Na<SUP>+</SUP>(0.55)<Cs<SUP>+</SUP>(0.85)<Rb<SUP>+</SUP>(1.00)<K<SUP>+</SUP>(1.10) at pH 2 and Cs<SUP>+</SUP>(1.20)<Rb<SUP>+</SUP>(1.72)<Na<SUP>+</SUP>(1.78)<Li<SUP>+</SUP>(1.80)<K<SUP>+</SUP>(1.81) at pH 10. The point of zero charge(PZC) of CRYMO was estimated to be much lower than 2. The unusual selectivity for K<SUP>+</SUP> and Rb<SUP>+</SUP> ions can be successfully applied to some ion-exchange separations: <I>e.g.</I>, the removal of K<SUP>+</SUP> ions from NaNO<SUB>3</SUB> and NaMnO<SUB>4</SUB> solutions, the removal of Rb<SUP>+</SUP> ions from a CsNO<SUB>3</SUB> solution, and the selective uptake of K<SUP>+</SUP> ions from seawater.
- 公益社団法人 日本化学会の論文
著者
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Tsuji Masamichi
Department Of Chemical Science Graduate School Of Natural Science And Technology Kanazawa University
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Abe Mitsuo
Department Of Veterinary Anatomy Rakuno Gakuen University School Of Veterinary Medicine
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