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Methylene Blue Dimerization Does Not Interfere in Surface-Area Measurements of Kaolinite and Soils

Published online by Cambridge University Press:  28 February 2024

Marcelo J. Avena ,
Laura E. Valenti ,
Valeria Pfaffen  and
Carlos P. De Pauli
Marcelo J. Avena
Affiliation:
INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina
Laura E. Valenti
Affiliation:
INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina
Valeria Pfaffen
Affiliation:
INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina
Carlos P. De Pauli*
Affiliation:
INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Methylene blue (MB) was adsorbed from aqueous solutions onto a kaolinite and four soil samples to determine the effects of MB dimerization on the measured surface area. Adsorption isotherms were prepared using four adsorbing solutions containing, respectively, 9, 46, 71, and 83% of MB molecules in the dimeric state. Langmuir-type isotherms were obtained in each case. The results indicate that equilibration occurs quickly. The aggregation state of MB molecules at the surface does not depend on the aggregation state in the initial adsorbing solutions, but on the final equilibrium concentration of MB. A comparison with the specific surface area measured by adsorption of ethylene glycol monoethyl ether indicates that MB adsorbs as a monomer, regardless of the aggregation number in solution. This result occurs owing to the strength of monomer-surface and monomer-monomer interactions. If monomer-surface interactions are favored, the MB dimer adsorbs in the monomeric form. If monomer-monomer interactions are favored, dimer adsorption may occur. The visible spectra of adsorbed molecules indicated that MB was present at the surface as a mixture of monomeric and dimeric species. These results suggest that dimers are formed in the contact region between two aggregating particles.

Keywords

Dye AdsorptionEthylene Glycol AdsorptionKaolinite SurfaceMethylene Blue DimerizationSpecific Surface Area
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 2 , April 2001 , pp. 168 - 173
Copyright
Copyright © 2001, The Clay Minerals Society

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