Some Basic Terms used in Adsorption
|Interface : Any surface is a plane which separates any two phases in contact with each other. The plane which separates any two phase is generally called aninterface between the two phases.|
Adsorbate and Adsorbent: The substance which gets adsorbed on any surface is called adsorbate for example, if a gas gets adsorbed on to the surface of a solid, then the gas is termed as the adsorbate.
The substance on the surface of which adsorption takes place is calledadsorbent.
Desorption: The removal of the adsorbed substance from a surface is called desorption.
|Absorption: When the molecules of a substance are uniformly distributed throughout the body of a solid or liquid. This phenomenon is called absorption.|
Sorption: The phenomenon in which adsorption and absorption occur simultaneously is called sorption.
Mc. Bain introduced a general term sorption describeing both the processes, however adsorption is instantaneous i.e. a fast process while absorption is a slow process.
|Occlusion: When adsorption of gases occur on the surface of metals this is called occlusion.|