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The Dissolution of Amorphous Silica in the Presence of Tropolone Under Acidic Conditions

Published online by Cambridge University Press:  01 January 2024

Mayumi Etou ,
Yutaka Tsuji ,
Kenji Somiya ,
Yoshihiro Okaue  and
Takushi Yokoyama
Mayumi Etou
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, 8128581, Fukuoka, Japan
Yutaka Tsuji
Affiliation:
Kurume National College of Technology, Komorino, Kurume, 8308555, Fukuoka, Japan
Kenji Somiya
Affiliation:
JFE Engineering, Suehiro-cho, Tsurumi-ku, Yokohama, 2308611, Kanagawa, Japan
Yoshihiro Okaue
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, 8128581, Fukuoka, Japan
Takushi Yokoyama*
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, 8128581, Fukuoka, Japan
*
*E-mail address of corresponding author: yokoyamatakushi@chem.kyushu-univ.jp
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Abstract

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Dissolution of amorphous silica or silicate is an important reaction to release silicic acid in natural water and this reaction is affected by several factors. The existence of a natural organic compound, tropolone, because of its abundance, is of particular importance. In the present study, the dissolution of amorphous silica in the presence of tropolone (HL) was investigated in an aqueous solution under acidic conditions. The dissolution is controlled by the reaction between silicic acid and tropolone (Si(OH)4 + 3HL + H+ ⇌ SiL3+ + 4H2O), where the conditional formation constant K = [SiL3+]/[Si(OH)4][HL]3[H+]). The solubility of amorphous silica in the presence of tropolone was significantly greater than that in pure water due to the formation of the Si-tropolonate complex in the solution. The acceleration of silica dissolution by tropolone depends on the reaction pH and tropolone concentration. The solubility of the amorphous silica in the tropolone solution at pH 1 was approximately ten times greater than in the 0.1 mol/dm3 HCl used as a reference. This increase in the solubility correlates to a K value of the Si-tropolone complex at each pH. From the solubility experiments, the conditional formation constants (log K) of the Si-tropolonate complex at each reaction pH 1, 2, and 3 were 6.39, 5.88, and 5.77, respectively. The significant acceleration of the dissolution of amorphous silica by tropolone at pH 1 can be attributed to the large formation constant of the Si-tropolonate complex.

Keywords

Amorphous Silica DissolutionDissolution Rate ConstantSolubilityTropolone
Type
Article
Information
Clays and Clay Minerals , Volume 62 , Issue 3 , June 2014 , pp. 235 - 242
Copyright
Copyright © Clay Minerals Society 2014

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