Freundlich adsorption isotherm
Adsorption is usually described through isotherms, that is, the amount of adsorbate on the adsorbent as a function of its pressure (if gas) or concentration (if liquid) at constant temperature. The quantity adsorbed is nearly always normalized by the mass of the adsorbent to allow comparison of different materials.
The Freundlich equation or Freundlich adsorption isotherm, an adsorption isotherm, is a curve relating the concentration of a solute on the surface of an adsorbent to the concentration of the solute in the liquid with which it is in contact.
|x||mass of adsorbate (dimensionless)|
|m||mass of adsorbent (dimensionless)|
|K||empirical constant for each adsorbent-adsorbate pair at a given temperature. (dimensionless)|
|p||equilibrium pressure of adsorbate (dimensionless)|
|n||empirical constant for each adsorbent-adsorbate pair at a given temperature. (dimensionless)|