Freundlich adsorption isotherm is an empirical relationship between the quantity of gas adsorbed into a solid surface and the gas pressure.
Adsorption isotherms deal with environmental protection and adsorption techniques. The two primary methods used for predicting the adsorption capacity of a given material are known as the Freundlich and Langmuir isotherms. An adsorption isotherm is a graph representing the variation in the amount of adsorbate(x) adsorbed on the surface of the adsorbent with the change in pressure at a constant temperature.
Freundlich Adsorption Isotherm
Freundlich adsorption gives the variation in the quantity of gas adsorbed by a unit mass of solid adsorbent with the change in pressure of the system for a given temperature. The following equation can represent the expression for the Freundlich isotherm:
x/m = kp1/n
Where x is the mass of the gas adsorbed,
m is the mass of the adsorbent,
P is the pressure and
n is a constant which depends upon the nature of the adsorbent and the gas at a given temperature.