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  • Title: Suitability of dye-clay complexes for removal of non-ionic organic compounds from aqueous solutions.
    Author: Borisover M, Graber ER, Bercovich F, Gerstl Z.
    Journal: Chemosphere; 2001 Aug; 44(5):1033-40. PubMed ID: 11513388.
    Abstract:
    Aqueous sorption of phenol, atrazine and naphthalene was measured on complexes formed from Na-montmorillonite (Fischer bentonite) and the organic cationic dyes crystal violet and rhodamine-B. Sorption isotherms were found to be non-linear. This agrees well with the rigid nature of the dye-clay organic coverage, which provides a finite surface for adsorption. High values of organic carbon-normalized distribution coefficients reached 20,000-25,000 for atrazine on rhodamine-B-montmorillonite, 7000 for atrazine on crystal violet-montmorillonite, and 1500 for phenol on crystal violet-montmorillonite. As such, dye-clays may significantly extend the variety of organoclay sorbents that effectively reduce aqueous concentrations of non-ionic organic compounds.
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