Effect of silicate ions on conversion of ferric hydroxide to β-FeOOH and α-Fe 2O 3

Sang Koo Kwon, Ken'ichi Kimijima, Kiyoshi Kanie, Atsushi Muramatsu, Shigeru Suzuki, Eiichiro Matsubara, Yoshio Waseda

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21 Citations (Scopus)


Ferric hydroxide (Fe(OH) 3) gel, prepared from FeCl 3 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-Fe 2O 3, and the addition of silicate ions in the Fe(OH) 3 gel decreased the conversion rate to β-FeOOH and αFe 2O 3 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.

Original languageEnglish
Pages (from-to)155-158
Number of pages4
JournalMaterials Transactions
Issue number2
Publication statusPublished - 2005 Feb


  • Akaganeite
  • Ferric oxyhydroxide
  • Fine particle
  • Gel
  • Hematite
  • Silicate ion


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