Abstract
Na- and Ca-exchanged smectite in aqueous suspension have been studied using the polarized attenuated total reflectance (ATR)-FTIR technique. These spectra correspond to the first reported use of polarization methods to study smectite particles in aqueous suspension. Similar to the behavior of hydrous metal oxides, a thin, stable layer of smectite particles was found to coat the ZnSe internal reflection element (IRE) upon exposure to a dilute aqueous suspension (solids concentration of 10 g dm-3). The As spectrum was very similar to the transmission IR spectrum of the smectite indicating that the ATR-FTIR spectra are composed of a thin film of smectite in contact with a thick layer of water. As and Ap polarized in situ ATR-FTIR spectra of wet and dry Na- and Ca-SWy-1 indicated that the smectite particles were highly oriented with the (001) face parallel to the surface of the ZnSe IRE. The Ap polarized ATR-FTIR spectra clearly resolved the position of the perpendicular Si−O stretching vibration at 1075 cm-1...
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