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This article in SSSAJ

  1. Vol. 39 No. 3, p. 474-479
    Received: Oct 11, 1974
    Accepted: Feb 3, 1975

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Infrared Study of the Sorption of Phenol and p-Nitrophenol by Montmorillonite1

  1. S. Saltzman2 and
  2. S. Yariv3



The sorption of phenol and p-nitrophenol by montmorillonite saturated with different cations was studied by IR and X-ray spectroscopy. Various associations between interlayer cations, water, and phenols were proven. Depending on the nature of the cation, phenol can act either as a proton donor or acceptor. The electrophylic NO2 substituent of the ring increases the acidic strength of the phenol group: therefore, p-nitrophenol tends to behave mainly as a proton donor. The nitro-group acts as an electron donor and, depending on the hydration status of the clay, either accepts protons from water coordinated to cations, or directly coordinates to the metallic cations.

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