SUBSTITUTION OF Mg^<2+> IN SEPIOLITE WITH Cu^<2+> IN AQUEOUS SOLUTIONS OF VARIOUS CUPRIC SALTS

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概要

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• Substitution of Mg^<2+> with Cu^<2+> in a fibrous clay mineral sepiolite having intracrystalline tunnels has been studied in aqueous solutions of CuSO_4 and Cu(CH_3COO)_2. Anisotropic spectra of ESR showed that the Mg^<2+> ions on the tunnel wall in sepiolite crystal lattice were substituted with Cu^<2+> ions. The initial Cu^<2+>-substitution rate in aqueous solution of CuSO_4 increased with an increase of the concentration of Cu^<2+> ions. On the other hand, the initial substitution rate in aqueous solutions of Cu(CH_3COO)_2 was independent of the concentration of Cu^<2+> ions. The Cu^<2+>-substitution rate in CuSO_4 solution was faster than that in Cu(CH_3COO)_2 solution. Apparent activation energies for the Mg^<2+> ion-substitution of sepiolite with Cu^<2+> were determined to be 21.2kJ/mol and 19.4kJ/mol in the CuSO_4 and Cu(CH_3COO)_2 solutions, respectively.

著者

• MURAOKA Masahiro

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

• KODAMA Tatsuya

  Department of Chemistry & Chemical Engineering, Faculty of Engineering, Niigata University

• Kodama Tatsuya

  Department Of Chemistry And Chemical Engineering Faculty Of Engineering Niigata University

• Kitayama Y

  Niigata Univ. Niigata

• Kitayama Yoshie

  Department Of Applied Physics And Chemistry The University Of Electro-communications

• OKAMURA Mutsuo

  Graduate School of Science and Technology, Niigata University

• KONNO TAMAKI

  Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University

• ABE JIN

  Graduate School of Natural Science and Technology, Niigata University

• Okamura Mutsuo

  Graduate School Of Natural Science And Technology Niigata University

• Abe Jin

  Graduate School Of Natural Science And Technology Niigata University

• Muraoka Masahiro

  Department Of Chemistry And Chemical Engineering Faculty Of Engineering Niigata University

• Konno Tamaki

  Department Of Chemistry And Chemical Engineering Faculty Of Engineering Niigata University

• Muraoka Masahiro

  Department Of Applied Chemistry Faculty Of Engineering Osaka Institute Of Technology

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