אסיף מאגר המחקר החקלאי

Suitability of dye-clay complexes for removal of non-ionic organic compounds from aqueous solutions

Year:

2001

Source of publication :

Authors :

Volume :

44

Co-Authors:

Borisover, M., Institute of Soil, Water and Environmental Sciences, Volcani Center, ARO, P.O. Box 6, 50250 Bet Dagan, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Volcani Center, ARO, P.O. Box 6, 50250 Bet Dagan, Israel
Bercovich, F., Institute of Soil, Water and Environmental Sciences, Volcani Center, ARO, P.O. Box 6, 50250 Bet Dagan, Israel
Gerstl, Z., Institute of Soil, Water and Environmental Sciences, Volcani Center, ARO, P.O. Box 6, 50250 Bet Dagan, Israel

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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. © 2001 Elsevier Science Ltd. All rights reserved.

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