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Updated: Jun 26, 2026

Preparation of Functional Silica Using a Bioinspired Method
Published on: August 1, 2018
Acceleration effect of sulfate ion on the dissolution of amorphous silica
Shuqin Bai1, Shinji Urabe, Yoshihiro Okaue
1Department of Chemistry, Faculty of Science, Kyushu University, Ropponmatsu, Chuo-ku, Fukuoka 810-8560, Japan.
Abstract:
The dissolution rate of amorphous silica is enhanced by sulfate ions. The zeta potential for silica particles in Na(2)SO(4) 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 SO(4)(2-) ion and SiO(-) on the surface of silica. The dissolution rate of amorphous silica may be accelerated by the specific adsorption of SO(4)(2-) ions because of a decrease in the strength of the [triple bond]Si-O-Si[triple bond] bond in amorphous silica due to donation of electron density from the adsorbed SO(4)(2-) ions.
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