A Fluorescence Study of the Adsorption of Water, Methanol, and Acetic Acid on an Activated Europium Ion-exchanged Mordenite

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Abstract
The adsorption of water, methanol, and acetic acid on an activated Eu(III) ion-exchanged mordenite(Eu–M) has been studied by the measurement of the fluorescence of the Eu2+ ion which was produced by the dehydration at 500 °C. The emission peak of the Eu2+ ion sifted to a shorter wavelength on exposure to water and other simple molecules. The magnitude of the shift was correlated to the specific dielectric constant of the adsorbate. The quantum yield for the Eu2+ emission band after gas adsorption decreased in all cases. Also, the lifetime in the Eu2+-adsorbate system was shorter than that in an activated Eu–M sample. The rate constants for the radiationless transitions were more sensitive to the nature of the adsorbates, and the order of the quenching power was H2O>D2O>CH3OH.
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