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Related Experiment Videos

Modeling silica sorption to iron hydroxide.

Christina C Davis1, Hsiao-Wen Chen, Marc Edwards

  • 1Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061-0246, USA.

Environmental Science & Technology
|March 7, 2002
PubMed
Summary

Silica sorption onto ferric hydroxide can exceed a monolayer, even with positive particle charge. A new model explains this by including dimeric silica binding to iron sites, improving predictions of silica sorption.

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Surface Science

Background:

  • Silica sorption onto ferric hydroxide is crucial for understanding water quality.
  • Existing models fail to explain high silica sorption densities observed in natural waters.
  • Particle zeta potential anomalies during silica sorption indicate limitations in current models.

Purpose of the Study:

  • Investigate silica sorption mechanisms onto ferric hydroxide across a pH range (5.0-9.5).
  • Develop an improved surface complexation model to account for observed sorption phenomena.
  • Explain high sorption densities and zeta potential inconsistencies.

Main Methods:

  • Conducted sorption experiments with varying silica concentrations (0-200 mg/L as SiO2) and pH.
  • Measured sorption densities and particle zeta potential.

Related Experiment Videos

  • Formulated and tested an extended surface complexation model incorporating dimeric silica.

    • Main Results:

    • Observed silica sorption densities exceeding monolayer capacity at typical environmental silica concentrations.
    • Sorption equaled or exceeded monolayer capacity while particle zeta potential remained positive.
    • The extended model accurately fitted sorption data up to 0.40 mol SiO2/mol Fe.
    • The new model successfully predicted trends in zeta potential and H+ release.

    Conclusions:

    • Soluble dimeric silica (Si2O2(OH)5-) directly sorbs to iron surface sites, explaining high sorption densities.
    • The proposed extended surface complexation model provides a more accurate representation of silica-ferric hydroxide interactions.
    • This research advances the understanding of silica behavior in environmental systems.