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Competitive adsorption of methylene blue and crystal violet to montmorillonite

Published online by Cambridge University Press:  09 July 2018

G. Rytwo ,
S. Nir  and
L. Margulies
G. Rytwo
Affiliation:
Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel
S. Nir
Affiliation:
Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel
L. Margulies
Affiliation:
Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel
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Extract

Methylene blue (MB) and crystal violet (CV) have been found to be adsorbed in amounts greater than the cation exchange capacity (CEC) of clays (Hang & Brindley, 1970; Ghosal & Mukherjee, 1972; Venugopal & Nair, 1974).

In previous work (Rytwo et al., 1991), it was shown that CV adsorbs to montmorillonite up to 1·4 mmole dye/g clay. The amount of dye added in those experiments was up to 1·6 mM/g clay. Yet, when the added amount of CV and MB was 3·5 mM/g (Rytwo et al., unpublished), almost 1·6 (200% of the CEC) and 1·2 mM/g clay, respectively, were adsorbed. Margulies et al. (1988), who studied the adsorption of thioflavin T and MB to montmorillonite, showed that these dyes adsorb up to 1·4 and 1·2 mM dye/g clay, which corresponds to 175% and 150% of the CEC, respectively.

Type
Notes
Information
Clay Minerals , Volume 28 , Issue 1 , March 1993 , pp. 139 - 143
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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References

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