alexa Acceleration effect of sulfate ion on the dissolution of amorphous silica.
Engineering

Engineering

Journal of Biosensors & Bioelectronics

Author(s): Bai S, Urabe S, Okaue Y, Yokoyama T

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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. This article was published in J Colloid Interface Sci and referenced in Journal of Biosensors & Bioelectronics

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