The competitive adsorption of methylene-blue on to Na-montmorillonite from binary-solution with N-alkylytrimethylammonium surfactants

BREEN, C. and LOUGHLIN, H. (1994). The competitive adsorption of methylene-blue on to Na-montmorillonite from binary-solution with N-alkylytrimethylammonium surfactants. Clay Minerals, 29 (5), 775-783.

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Abstract

The affect of competing surfactant molecules, n-decyltrimethylammonium bromide (C10TAB) and n-hexadecyltrimethylammonium bromide (C16TAB), on the adsorption equilibrium between methylene blue (MB) and Na+-montmorillonite has been studied using visible spectrophotometry. The MB competed effectively with both these surfactants and also tetramethylammonium ions, which were used as a model for the surfactant head group. At loadings up to 50% of the CEC of the clay, all of the MB was associated with the clay or clay/surfactant system. Evidence for the presence of monomer, MB+, dimer, (MB+)2, trimer, (MB+)3, and protonated monomer, MBH2+, was obtained in each case, with the trimeric form dominanting at loading >5% of the CEC. The spectra of adsorbe MB reflected the difference in chain length between C10TAB and C16TAB and indicated that a significant amount of monomeric, MB+, was solubilized in the C16TAB surfactant clusters on the clay surface. Pre-adsorbed MB was not displaced by added C16TAB surfactant.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Depositing User: Jill Hazard
Date Deposited: 14 May 2010 15:37
Last Modified: 28 Sep 2010 17:12
URI: http://shura.shu.ac.uk/id/eprint/1844

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