Meaning of Adsorption

What is Adsorption:

Adsorption is the process in which atoms or molecules of one substance are retained on the surface of another substance.

In chemistry and physics, adsorption is a surface phenomenon in which a component tends to concentrate at the interface, that is, between one phase and another of different substances.

In adsorption, the substance that migrates to the surface is called adsorbate and the surface on which the process occurs is identified as adsorbent.

There are two types of adsorption: physical adsorption and chemical adsorption.

Physical adsorption or physisorption is the phenomenon in which the adsorbate retains its identity by forming multilayers. This type of adsorption is reversible if the temperature rises and the pressure falls.

In chemical adsorption or chemisorption, the adsorbate usually loses its identity and its formation is monolayer. This process is irreversible.

Adsorption isotherms is the equilibrium ratio between adsorbed gas and gas pressure, in other words, it is the general ratio between the amount of gas adsorbed by a solid at a constant temperature.

Adsorption and absorption

Adsorption is a surface phenomenon that is located between two substances. The adsorbate sticks to the surface of one of the substances without being part of any of them. The composition of the adsorption is different from that of the original phases, such as adsorption with activated carbon for dechlorination of water.

On the other hand, absorption is the physical penetration of one substance into another, as is, for example, the chemical case of the separation of gases by means of a liquid solvent that absorbs one of the gases to create a new substance.

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