MODEL FOR COMPETITIVE ADSORPTION OF ORGANIC CATIONS ON CLAYS.

L. Margulies*, H. Rozen, S. Nir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

116 Scopus citations

Abstract

The adsorption on montmorillonite of two monovalent organic cations, methylene blue (MB) and thioflavin T (TFT), was studied in four different situations: (1) separate adsorption of MB or TFT; (2) competitive adsorption of TFT and Cs; (3) competitive adsorption of the two organic cations from their equimolar solutions; and (4) adsorption of TFT on a clay whose cation-exchange capacity (CEC) had been previously saturated with MB. A model was developed to evaluate the strength of the clay-organic cation interactions. The charge reversal predicted by the model beyond the CEC of the clay was confirmed by microelectrophoretic experiments. Study methods and results are discussed.

Original languageEnglish
Pages (from-to)270-276
Number of pages7
JournalClays and Clay Minerals
Volume36
Issue number3
DOIs
StatePublished - 1988

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