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What is an Adsorption Isotherm? Describe Freundlich Adsorption Isotherm


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Solution

Adsorption isotherm:

  • “The variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature can be expressed by means of a curve termed as adsorption isotherm.”
  • “Freundlich, in 1909, gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature.”
  • The relationship can be expressed by the following equation:

xm=k.p1/nn>1,

  • where x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p,kandn are constants which depend on the nature of the adsorbent and gas at a particular temperature.

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