Ion-exchange and Structural Properties of Magadiite(Physical and Chemical Properties of Clays,Proceedings of the 13^<th> International Clay Conference)
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概要
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The ion-exchange reactions of Na-magadiite with metal cations such as H^+, K^+, Mg^<2+>, Ca^<2+>, Sr^<2+>, Ba^<2+>, Cu^<2+> and Zn^<2+> were studied in an aqueous medium. The H^+ ion and all divalent metal ions except Mg^<2+> exchanged with Na^+ in an aqueous solution with a stoichiometric amount of the metal ion. K^+ and Mg^<2+> showed poor reactivity with the Na-magadiite. Na^+ was not fully replaced even with a K^+ or Mg^<2+> concentration that was 100 times the Na^+ concentration. The pH dependence of Cu^<2+> for the ion-exchange reaction was different from that of other metal ions. XRD analysis revealed that the structure of the Na-magadiite differed from the Cu- or H-magadiite. These differences arose from structural changes in the silicate sheet due to the H^+ or Cu^<2+> adopting a different geometry in interaction with the oxygen atoms in the silicate sheet. Ethylene diamine (en) and pentaethylene hexamine (pentaen) react with Cu^<2+> to form stable cationic complexes: Cu(en)_2, which has a planar structure, and Cu(pentaen), which has an octahedral structure. The XRD patterns all revealed a difference between the basal spacings of the metal-magadiite and the sum of the crystalline ionic diameter of the metal and basal spacing of the H-magadiite. Na^+ remained in the interlayer of the magadiite in the presence of excess complexes. The degree of dehydration of the metal cation depends on the ion-exchange reactivity of the magadiite.
- 日本粘土学会の論文
著者
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MURAKAMI Yoshiko
Department of Chemistry, Graduate School of Science and Engineering, Yamaguchi University
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Sasaki Yoshiaki
Department Of Chemistry And Geosciences Yamaguchi University
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Sasaki Yoshiaki
Department Of Biological Environment Faculty Of Bioresource Sciences Akita Prefectural University
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NANBA MASAFUMI
Department of Chemistry and Geosciences, Yamaguchi University
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TAGASHIRA SHOUJI
Department of Chemistry and Geosciences, Yamaguchi University
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Nanba Masafumi
Department Of Chemistry And Geosciences Yamaguchi University
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Murakami Yoshiko
Department Of Chemistry And Geosciences Yamaguchi University
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Tagashira Shouji
Department Of Chemistry And Geosciences Yamaguchi University
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