Suitability of dye-clay complexes for removal of non-ionic organic compounds from aqueous solutions.
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.
Borisover
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M
Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO, Bet Dagan, Israel. vwmichel@volcani.agri.gov.il
Graber
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ER
Bercovich
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Gerstl
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D000327:Adsorption; D000538:Aluminum Silicates; D001546:Bentonite / Q000737:chemistry; D002412:Cations; D000077215:Clay; D004396:Coloring Agents; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
D000538:Aluminum Silicates; D002412:Cations; D004396:Coloring Agents; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D001546:Bentonite; D000077215:Clay