Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

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  • Kwon Sang-Koo
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Kimijima Ken’ichi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Kanie Kiyoshi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Muramatsu Atsushi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Suzuki Shigeru
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Matsubara Eiichiro
    Institute for Materials Research, Tohoku University
  • Waseda Yoshio
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

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Other Title
  • Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe2O3
  • Effect of Silicate Ions on Conversion of Ferric Hydroxide to ベータ FeOOH and アルファ Fe2O3
  • Effect of Silicate Ions on Conversion of Ferric Hydroxide to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

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Abstract

Ferric hydroxide (Fe(OH)3) gel, prepared from FeCl3 and NaOH solutions, was aged at 100°C in the presence and absence of silicate ions to examine the effect of silicate ions on the conversion process of condensed Fe(OH)3 gel to iron oxides. The aged suspensions containing colloidal particles in each stage were separated into solid particles and supernatant solutions by centrifugation. X-ray diffraction measurements and transmission electron microscopic observations of the solid particles revealed that β-FeOOH was formed from the Fe(OH)3 gel and subsequently converted into α-Fe2O3, and the addition of silicate ions in the Fe(OH)3 gel decreased the conversion rate to β-FeOOH and α-Fe2O3 particles. IR measurements of the solid particles and inductively coupled plasma analyses of the supernatant solutions showed that the adsorption of silicate ions on specific plane of the solid particles was decisive factor for the suppression of the conversion process.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 46 (2), 155-158, 2005

    The Japan Institute of Metals and Materials

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