Transformation of Chlorinated Aliphatic Compounds by Ferruginous Smectite
- 18 January 2001
- journal article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 35 (4) , 805-809
- https://doi.org/10.1021/es0015592
Abstract
A series of chlorinated aliphatic compounds (RCl, including carbon tetrachloride (PCM), 1,1,1-trichloroethane (TCA), 1,1,2,2-tetrachloroethane (TeCA), pentachloroethane (PCA), hexachloroethane (HCA), trichloroethene (TCE), tetrachloroethene (PCE), trichloronitromethane (chloropicrin, CP), and trichloroacetonitrile (TCAN)) was reacted with ferruginuous smectite (sample SWa-1 from The Source Clays Repository), SWa, in aqueous suspension under anoxic conditions. Compounds highly polarizable or sharing substituents that facilitate charge delocalization adsorbed faster by reduced (SWa-R) than by unaltered (SWa-U) clay, indicating stronger dipole−dipole interactions between the substituents and the clay surface and/or hydrating water molecules. The reduction of the clay accelerated RCl adsorption up to 100-fold. Incubations with SWa-R promoted RCl reduction (CP, TCAN) or dehydrochlorination (TeCA and PCA). The reduction of structural Fe catalyzes the transformation of RCl via Brønsted and Lewis-basic promoted pathways. This study indicates that oxidation state of the structural Fe in SWa greatly alters surface chemistry and has a large impact on clay-organic interactions.Keywords
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