The transformation of .GAMMA.-FeO(OH) to Fe3O4 and green rust II in an aqueous solution.
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概要
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A mechanism of the transformation of γ-FeO(OH) to Fe<SUB>3</SUB>O<SUB>4</SUB> and/or green rust II in an aqueous solution containing Fe<SUP>II</SUP> ion in the presence or absence of the SO<SUB>4</SUB><SUP>2−</SUP> ion at 298 K is described. γ-FeO(OH) is dissolved by two mols of Fe<SUP>II</SUP> ions adsorbed on the surface of γ-FeO(OH), and a dissolved species (DS) is formed, which is then transformed to Fe<SUB>3</SUB>O<SUB>4</SUB> or green rust II. The equilibrium of the formation of green rust II from γ-FeO(OH) is represented by:<BR><I>K</I>=[H<SUP>+</SUP>]<SUP>2</SUP>⁄(<I>K</I><SUB>h</SUB><SUP>2</SUP>[Fe<SUP>2+</SUP>]<SUP>2</SUP>[SO<SUB>4</SUB><SUP>2−</SUP>]) <I>K</I>=2.14×10<SUP>8</SUP>,<BR>where <I>K</I><SUB>h</SUB> is the hydrolysis constant of Fe<SUP>2+</SUP>. This equation shows that, for a given proton concentration(pH), higher concentrations of Fe<SUP>2+</SUP> and SO<SUB>4</SUB><SUP>2−</SUP> ions facilitate the formation of green rust II from γ-FeO(OH). When little green rust II is formed, the DS is transformed to Fe<SUB>3</SUB>O<SUB>4</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Tamaura Yutaka
Department Of Chemistry Tokyo Institute Of Technology
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KATSURA Takashi
Department of Chemistry
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Yamada Kaoru
Department Of Biosciences And Informatics Faculty Of Science And Technology Keio University
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Katsura Takashi
Department of Chemistry, Tokyo Institute of Technology
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Saturno Mervelina
Department of Chemistry, Tokyo Institute of Technology
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