Water, Air, and Soil Pollution

, Volume 72, Issue 1–4, pp 205–211

Adsorptive selectivity of organic-cation-modified bentonite for nonionic organic contaminants

  • James A. Smith
  • Peter R. Jaffé
Article
  • 118 Downloads

Abstract

The mineral surface of Wyoming bentonite was modified by replacing inorganic ions with four quaternary ammonium cations in an amount equal to 40 percent of the cation-exchange capacity of the bentonite. The four quaternary ammonium cations used were tetramethylammonium (TMA), tetraethylammonium (TEA), benzyltrimethylammonium (BTMA), and benzyltriethylammonium (BTEA). Sorption of benzene, tetrachloromethane, trichloroethene, 1,2-dichlorobenzene, and naphthalene to the modified sorbents from water at 20 °C was investigated. All five solutes were sorbed strongly by TEA-, BTMA-, and BTEA-bentonite, but only benzene and tetrachloromethane were strongly sorbed by TMA-bentonite. The sorption isotherms are distinctly nonlinear and the magnitude of sorption is not correlated with the solute's aqueous solubility. In contrast, sorption of trichloroethene, 1,2-dichlorobenzene, and naphthalene to TMA-bentonite was negligible relative to benzene and tetrachloromethane sorption. The apparent absence of solute selectivity by TEA-, BTMA-, and BTEA-bentonite, along with their large sorption capacities, indicates that these sorbents can potentially be useful as components of landfill liners or slurry walls to decrease the mobility of a variety of nonionic organic contaminants.

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • James A. Smith
    • 1
  • Peter R. Jaffé
    • 2
  1. 1.Dept. of Civil Engineering and Applied MechanicsUniversity of VirginiaCharlottesvilleUSA
  2. 2.Dept. of Civil Engineering and Operations ResearchPrinceton UniversityPrincetonUSA

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