Structure Control of Calcium Silicate Hydrate Gels for Dye Removal Applications

The structure of calcium silicate hydrate (C‐S‐H) gels was modified by hydrothermal reaction with aqueous acetic acid solvent, and then the C‐S‐H gels were used for dye removal from aqueous solution. With increasing acetic acid concentration, the Ca:Si molar ratio decreased and the length of the sil...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2016-07, Vol.99 (7), p.2493-2496
Main Authors: Maeda, Hirotaka, Abe, Toshiyuki, Ishida, Emile Hideki, Kasuga, Toshihiro
Format: Article
Language:English
Subjects:
Acetic acid
Adsorption
adsorption/adsorbents
Anions
Aqueous solutions
Bridging
Calcium
Calcium silicate hydrate
Calcium silicates
Chains
Dyes
Gels
hydrothermal
Ions
Methylene blue
purification
Silica
Silicates
Silicon dioxide
Surface chemistry
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Summary:The structure of calcium silicate hydrate (C‐S‐H) gels was modified by hydrothermal reaction with aqueous acetic acid solvent, and then the C‐S‐H gels were used for dye removal from aqueous solution. With increasing acetic acid concentration, the Ca:Si molar ratio decreased and the length of the silicate anion chain structure of the C‐S‐H gels increased. The silicate anion chain length affects the number of available silanol groups on the surface of the C‐S‐H gel: the longer the silicate anion chain length, the greater the number of negative charges and the higher the surface potential. C‐S‐H gels with a long silicate anion structure exhibited higher adsorption capacity for methylene blue than gels with a short silicate anion structure. The enhanced adsorption capacity of the C‐S‐H gels is related to the higher number of silanol groups in the bridging silica tetrahedra of the intermediate anion chain structure compared with those in the end units of silica tetrahedra.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14245