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Adsorption of organic vapors on polar surfaces- Recent advances

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Abstract

This paper summarizes recent research on the adsorption of organic vapors on surfaces. Since the low gas phase concentration range is typical for environmental situations, this review is restricted to these adsorption coefficients.

Two environmental parameters have a strong influence on the adsorption of organic vapors on polar surfaces:temperature andrelative humidity (which is the most suitable parameter for describing the influence of ambient moisture). An exponential relationship was found for the adsorption coefficientversus relative humidity and the reciprocal temperature, respectively. Comparing the heats of adsorption, two different groups of substances emerged: polar chemicals exhibited heats of sorption which were higher than their corresponding heats of condensation due to their ability to form hydrogen bonds, while for the nonpolar compounds the opposite was true. Sorption takes place on the surface of an adsorbed water film when the relative humidity exceeds the value which is necessary to form a monomolecular layer of water on the surface of the adsorbent (≥ 30 % relative humidity). Therefore, at temperature below 0 °C, a change in the adsorption behavior might be expected due to a change of properties of the adsorbed water film. However, no alterations were observed at temperatures from -12 °C to + 4 °C (adsorption on quartz sand). The results were comparable to those at much higher temperatures (50 – 80 °C).

A statistical approach for the prediction of the adsorption coefficients from physico-chemical parameters of the substances (vapor pressure, polarizability, and electron-donating capability) was developed and good agreement was found with experimental results and independent data from the literature. Finally, two special cases, the adsorption on bulk water and ice, are discussed.

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Goss, KU. Adsorption of organic vapors on polar surfaces- Recent advances. Environ. Sci. & Pollut. Res. 1, 34–37 (1994). https://doi.org/10.1007/BF02986923

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