Inhibition of conversion process from Fe(OH)3 to β-FeOOH and α-Fe2O3 by the addition of silicate ions

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

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


To examine the influence of silicate ions on a conversion process of condensed ferric hydroxide (Fe(OH)3) gel to ferric oxyhydroxides and iron oxides, the Fe(OH)3 gel was aged at 60°C in the presence and absence of silicate ions. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used for characterizing the resulting solid particles. XRD profiles and TEM micrographs showed that the Fe(OH)3 gel transferred into β-FeOOH and α-Fe2O3 particles by aging in the absence of silicate ions. On the other hand, silicate ions suppressed the conversion of the Fe(OH)3 gel to β-FeOOH and α-Fe2O3 particles. The conversion of the Fe(OH)3 gel to α-Fe 2O3 particles is almost independent of pH of solution under the conditions in the present study, indicating that silicate ions essentially suppress the formation of β-FeOOH and α-Fe 2O3 particles.

Original languageEnglish
Pages (from-to)77-81
Number of pages5
JournalIsij International
Issue number1
Publication statusPublished - 2005


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

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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