The specific interaction of Mg and alkaline earth metal ions with well-defined surfaces of .ALPHA.-HCrO2 and Cr2O3.
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概要
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The selectivity sequences of Mg and alkaline earth ions to the surface of α-HCrO<SUB>2</SUB> and Cr<SUB>2</SUB>O3 were investigated by measuring the electrophoretic mobility and the surface charge density. The latter was determined by means of potentiometric titration. The selectivity sequence of Mg and alkaline earth ions to the α-HCrO<SUB>2</SUB> surface was determined as Mg>Ca>Sr∼Ba. This sequence was explained by the close configurational fitting of adsorbed metal ions to the solid surface. The reason is that the O–O distance on the (001) plane of Mg(OH)<SUB>2</SUB> and Ca(OH)<SUB>2</SUB> is similar to that of the α-HCrO<SUB>2</SUB>. On the amorphous Cr<SUB>2</SUB>O<SUB>3</SUB> and crystalline Cr<SUB>2</SUB>O<SUB>3</SUB>, exposing mainly the (001) plane, the affinity of varying ions was comparable. The isoelectric points (IEP) of the chromium(III) hydroxide oxides and oxides were discussed in connection with their surface crystallinity as determined by electron microscopy. A lower crystallinity gives a slightly higher IEP.
- 公益社団法人 日本化学会の論文
著者
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Kittaka Shigeharu
Department Of Chemistry Faculty Of Science Okayama University Of Science
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Okabe Takahiro
Department of Artificial Intelligence, Kyushu Institute of Technology
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Yamanaka Shigeru
Department of Chemistry, Faculty of Science, Okayama University of Science
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Yanagawa Naoto
Department of Chemistry, Faculty of Science, Okayama University of Science
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