My watch list
my.chemeurope.com

# Freundlich equation

The Freundlich Adsorption Isotherm is an adsorption isotherm, which 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.

The Freundlich Adsorption Isotherm is mathematically expressed as

$\ x/m=Kp^{1/n}$

or

$\ x/m=Kc^{1/n}$

where

p = Equilibrium pressure of adsorbate
c = Equilibrium concentration of adsorbate in solution.

K and 1/n are constants for a given adsorbate and adsorbent at a particular temperature.

There are basically two well established types of adsorption isotherm:

• the Langmuir adsorption isotherm (see Langmuir equation)