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Sorption of Cadmium in Surfactant-Amended Soils

Sorption of Cadmium in Surfactant-Amended Soils Surfactants can play an important role in controlling metal mobility when added to the soils. Proper selection of type and concentration of surfactant is crucial. The influence of cationic (cetyltrimethylammonium bromide, CTAB) and anionic (sodium dodecyl sulfate, SDS) surfactants on Cd sorption by three soils was studied in laboratory using batch systems. The initial Cd concentrations in solutions ranged from 5 to 160 mg L -1 . Surfactants were added to each soil at rates ranging from zero to >5.3 times the critical micelle concentration (CMC). In general, Cd sorption was found to conform to Freundlich isotherm. The cationic surfactant (CTAB) reduced the amount of Cd sorbed by the soils with the effect increasing from sub-CMC to supra-CMC levels. At the highest surfactant concentration tested (5.3 CMC), the Freundlich coefficient (K f ) values for Cd sorption decreased to 28.7, 61 and 62.9% of the values in the surfactant free soil for clay, calcareous, and sandy soils respectively. The influence of anionic surfactant (SDS) on Cd sorption by soils depended on the concentration of surfactant. Addition of SDS at sub-CMC increased the amount of Cd sorbed by soils studied, but at SDS concentration equivalent to 6.1 CMC, Cd sorption was decreased. Freundlich K f values decreased from 2.58, 2.05, and 1.86 to 2.19, 1.84, and 1.66 for clay, calcareous, and sandy soils respectively as a result of adding SDS at supra-CMC. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arid Land Research and Management Taylor & Francis

Sorption of Cadmium in Surfactant-Amended Soils

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Sorption of Cadmium in Surfactant-Amended Soils

Abstract

Surfactants can play an important role in controlling metal mobility when added to the soils. Proper selection of type and concentration of surfactant is crucial. The influence of cationic (cetyltrimethylammonium bromide, CTAB) and anionic (sodium dodecyl sulfate, SDS) surfactants on Cd sorption by three soils was studied in laboratory using batch systems. The initial Cd concentrations in solutions ranged from 5 to 160 mg L -1 . Surfactants were added to each soil at rates ranging from zero...
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Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1532-4990
eISSN
1532-4982
DOI
10.1080/153249801753127660
Publisher site
See Article on Publisher Site

Abstract

Surfactants can play an important role in controlling metal mobility when added to the soils. Proper selection of type and concentration of surfactant is crucial. The influence of cationic (cetyltrimethylammonium bromide, CTAB) and anionic (sodium dodecyl sulfate, SDS) surfactants on Cd sorption by three soils was studied in laboratory using batch systems. The initial Cd concentrations in solutions ranged from 5 to 160 mg L -1 . Surfactants were added to each soil at rates ranging from zero to >5.3 times the critical micelle concentration (CMC). In general, Cd sorption was found to conform to Freundlich isotherm. The cationic surfactant (CTAB) reduced the amount of Cd sorbed by the soils with the effect increasing from sub-CMC to supra-CMC levels. At the highest surfactant concentration tested (5.3 CMC), the Freundlich coefficient (K f ) values for Cd sorption decreased to 28.7, 61 and 62.9% of the values in the surfactant free soil for clay, calcareous, and sandy soils respectively. The influence of anionic surfactant (SDS) on Cd sorption by soils depended on the concentration of surfactant. Addition of SDS at sub-CMC increased the amount of Cd sorbed by soils studied, but at SDS concentration equivalent to 6.1 CMC, Cd sorption was decreased. Freundlich K f values decreased from 2.58, 2.05, and 1.86 to 2.19, 1.84, and 1.66 for clay, calcareous, and sandy soils respectively as a result of adding SDS at supra-CMC.

Journal

Arid Land Research and Management – Taylor & Francis

Published: Jan 1, 2001

Keywords: Cetyltrimethylammonium Bromide; Sodium Dodecyl Sulfate; Critical Micelle Concentration

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