Kinetics and Mechanism of Adsorption of Anionic Dyes on Montmorillonite Modified with Sodium Metasilicate

The mechanism of adsorption of anionic dyes on montmorillonite modified with sodium metasilicate is investigated. The kinetics of dye adsorption is approximated by a pseudo–second order model, and the adsorption isotherm is analyzed on the basis of the Langmuir and Dubinin–Radushkevich models. The v...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2021, Vol.95 (1), p.43-48
Main Authors: Kon’kova, T. V., Rysev, A. P., Mal’kova, Yu. O.
Format: Article
Language:English
Subjects:
Adsorption
Aluminosilicates
Aluminum silicates
Chemical Kinetics and Catalysis
Chemical reactions
Chemistry
Chemistry and Materials Science
Dyes
Free energy
Ions
Kinetics
Montmorillonite
Physical Chemistry
Sodium silicates
Surface chemistry
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Summary:The mechanism of adsorption of anionic dyes on montmorillonite modified with sodium metasilicate is investigated. The kinetics of dye adsorption is approximated by a pseudo–second order model, and the adsorption isotherm is analyzed on the basis of the Langmuir and Dubinin–Radushkevich models. The value of average free energy of adsorption E > 8 kJ/mol for all studied dyes, testifying to a surface chemical reaction between dye molecules and protonated silanol and aluminol groups on the surface of the edges of the aluminosilicate layers of the mineral. The adsorption of dyes is directly proportional to the increase in the temperature, mass, and charge of the organic anion and is inversely proportional to the increase in the ionic strength of the solution.
ISSN:0036-0244
1531-863X
DOI:10.1134/S003602442101012X