Abstract
To evaluate the effect of organic compounds on the dissolution rate of amorphous silica, the dissolution of amorphous silica in pure water and in organic electrolyte solutions were investigated at room temperature at pH 6. Based on the kinetic analyses, the dissolution rate constants of amorphous silica in the organic electrolyte solutions were 18-30 times larger than in pure water but less than those in the NaCl solution, which contained the same Na+ concentration as the organic electrolyte solution. The order of dissolution rate constants was NNaCl>Ntiron>Nphthalate>Nsalicylate>Nwater. In these experiments, the dried samples were analyzed by FT-IR, and the results indicated that all of the organic composition was adsorbed on the surface of the silica. Compared with pure water, the cations in the organic electrolyte solution were a dominant factor in increasing the dissolution rate of silica. However, compared with NaCl, the dissolution rate of silica decreased in the aromatic organic electrolyte solution due to the adsorption of the organic electrolytes on the surface of the silica as well as to a decrease in the exposed surface. In fact, organic anions containing in the organic electrolytes are retarding the dissolution rate of silica.
| Original language | English |
|---|---|
| Pages (from-to) | 220-224 |
| Number of pages | 5 |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 461 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Nov 5 2014 |
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All Science Journal Classification (ASJC) codes
- Surfaces and Interfaces
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry
Cite this
Kinetic study of silica dissolution in aqueous solutions of aromatic organic electrolytes. / Bai, Shuqin; Mu, Haorong; Naren, Gaowa; Okaue, Yoshihiro; Yokoyama, Takushi.
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 461, No. 1, 05.11.2014, p. 220-224.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Kinetic study of silica dissolution in aqueous solutions of aromatic organic electrolytes
AU - Bai, Shuqin
AU - Mu, Haorong
AU - Naren, Gaowa
AU - Okaue, Yoshihiro
AU - Yokoyama, Takushi
PY - 2014/11/5
Y1 - 2014/11/5
N2 - To evaluate the effect of organic compounds on the dissolution rate of amorphous silica, the dissolution of amorphous silica in pure water and in organic electrolyte solutions were investigated at room temperature at pH 6. Based on the kinetic analyses, the dissolution rate constants of amorphous silica in the organic electrolyte solutions were 18-30 times larger than in pure water but less than those in the NaCl solution, which contained the same Na+ concentration as the organic electrolyte solution. The order of dissolution rate constants was NNaCl>Ntiron>Nphthalate>Nsalicylate>Nwater. In these experiments, the dried samples were analyzed by FT-IR, and the results indicated that all of the organic composition was adsorbed on the surface of the silica. Compared with pure water, the cations in the organic electrolyte solution were a dominant factor in increasing the dissolution rate of silica. However, compared with NaCl, the dissolution rate of silica decreased in the aromatic organic electrolyte solution due to the adsorption of the organic electrolytes on the surface of the silica as well as to a decrease in the exposed surface. In fact, organic anions containing in the organic electrolytes are retarding the dissolution rate of silica.
AB - To evaluate the effect of organic compounds on the dissolution rate of amorphous silica, the dissolution of amorphous silica in pure water and in organic electrolyte solutions were investigated at room temperature at pH 6. Based on the kinetic analyses, the dissolution rate constants of amorphous silica in the organic electrolyte solutions were 18-30 times larger than in pure water but less than those in the NaCl solution, which contained the same Na+ concentration as the organic electrolyte solution. The order of dissolution rate constants was NNaCl>Ntiron>Nphthalate>Nsalicylate>Nwater. In these experiments, the dried samples were analyzed by FT-IR, and the results indicated that all of the organic composition was adsorbed on the surface of the silica. Compared with pure water, the cations in the organic electrolyte solution were a dominant factor in increasing the dissolution rate of silica. However, compared with NaCl, the dissolution rate of silica decreased in the aromatic organic electrolyte solution due to the adsorption of the organic electrolytes on the surface of the silica as well as to a decrease in the exposed surface. In fact, organic anions containing in the organic electrolytes are retarding the dissolution rate of silica.
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U2 - 10.1016/j.colsurfa.2014.07.048
DO - 10.1016/j.colsurfa.2014.07.048
M3 - Article
AN - SCOPUS:84906485557
VL - 461
SP - 220
EP - 224
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
IS - 1
ER -