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Sorption Characteristics of Organic Compounds on hexadecyltrimethylammonium-Smectite

Dep. of Crop and Soil Sciences, Michigan St. Univ., East Lansing, MI 48824

Cary T. Chiou

U.S. Geological Survey, Box 25046, MS 407, Denver Federal Center, Denver, CO 80225

*Corresponding author.

ABSTRACT

When hexadedyltrimethylammonium (HDTMA) ion is exchanged for metal cations like calcium in smectite, the sorptive properties of the clay are greatly modified. The resultant HDTMA-smectite complex behaves as a dual sorbent, in the sorption of organic compounds, in which the mineral fraction functions as a solid adsorbent and the organic (HDTMA) phase as a partition medium. Capacities of mineral adsorption and partition uptake by HDTMA in the HDTMA-smectites are illustrated by sorption of benzene, trichloroethene (TCE), and water as vapors on the dry sample and by sorption of benzene and TCE from water. The exchanged HDTMA in clay is found to be a much more powerful partition medium than ordinary soil organic matter in the uptake of benzene and TCE. Based on this finding, HDTMA-smectite appears to be an effective sorbent for removing organic contaminants from water. It is suggested that such sorptive organo-clay complexes could be used to enhance the containment capabilities of clay landfill liners and bentonite slurry walls.

Contribution of the Michigan State Univ. Agric. Exp. Stn. Journal. Article no. 12479.

Received for publication August 14, 1987.

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