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Adsorption of Benzyltrimethylammonium and Benzyltriethylammonium on Montmorillonite: Experimental Studies and Model Calculations

Published online by Cambridge University Press:  28 February 2024

Tamara Polubesova ,
Giora Rytwo ,
Shlomo Nir ,
Carina Serban  and
Leon Margulies
Tamara Polubesova
Affiliation:
The Seagram Center for Soil and Water Sciences, The Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
Giora Rytwo
Affiliation:
The Seagram Center for Soil and Water Sciences, The Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel MIGAL Galilee Technological Center, Kiryat Shmona, 10200, Israel
Shlomo Nir
Affiliation:
The Seagram Center for Soil and Water Sciences, The Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
Carina Serban
Affiliation:
The Seagram Center for Soil and Water Sciences, The Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
Leon Margulies
Affiliation:
The Seagram Center for Soil and Water Sciences, The Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
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Abstract

The adsorption of the monovalent organic cations benzyltrimethylammonium (BTMA) and benzyltriethylammonium (BTEA) to montmorillonite was studied as a function of their concentrations and ionic strength. At low ionic strength the adsorbed amounts of BTMA and BTEA reached values of the cation exchange capacity (CEC) of the clay. An increase in the ionic strength resulted in reduction in the adsorbed amounts of the organic cations, unlike the pattern observed previously with organic monovalent cationic dyes. The reduction in adsorbed amounts of BTMA and BTEA depended on the inorganic cations according to the sequence Cs+ > Na+ > Li+, which follows the sequence of binding coefficients of these inorganic cations added. The type of the anion (that is, Cl−, ClO4−, SO42-) had no effect on the adsorbed amounts. An adsorption model which considers the electrostatic Gouy-Chapman equations, specific binding and closeness of the system could adequately simulate the adsorbed amounts of BTMA and BTEA and yield predictions for the effect of the ionic strength and concentration of electrolytes. The binding coefficient employed was K = 5000 M−1 for the formation of neutral complexes of BTMA and BTEA. This value is larger than those found for the inorganic cations but is several orders of magnitude below those found for the monovalent dyes. The binding coefficients for the formation of charged complexes of BTMA and BTEA were 20 and 5 M−1, respectively. The basal spacing of the clay did not change significantly with the adsorbed amounts of both BTMA and BTEA up to the CEC.

Keywords

Basal SpacingBenzylalkylammonium AdsorptionCation Adsorption ModelIonic StrengthMontmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 6 , December 1997 , pp. 834 - 841
Copyright
Copyright © 1997, The Clay Minerals Society

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Footnotes

†

Deceased January 1997.

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