Acceleration effect of sulfate ion on the dissolution of amorphous silica

Shuqin Bai, Shinji Urabe, Yoshihiro Okaue, Takushi Yokoyama

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16 Citations (Scopus)

Abstract

The dissolution rate of amorphous silica is enhanced by sulfate ions. The zeta potential for silica particles in Na2SO4 solution was lower than that in NaCl solution with the same ionic strength. These facts indicate that the specific adsorption of sulfate ions occurred by overcoming repulsion between negative charges of the SO2-4 ion and Si{single bond}O- on the surface of silica. The dissolution rate of amorphous silica may be accelerated by the specific adsorption of SO2-4 ions because of a decrease in the strength of the {triple bond, long}Si{single bond}O{single bond}Si{triple bond, long} bond in amorphous silica due to donation of electron density from the adsorbed SO2-4 ions.

Original languageEnglish
Pages (from-to)551-554
Number of pages4
JournalJournal of Colloid And Interface Science
Volume331
Issue number2
DOIs
Publication statusPublished - Mar 15 2009

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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