Including the bulk properties of a liquid, solid or gas is a phenomenon of absorption. It includes the molecules or atoms that pass through the surface and enter the volume of the material.
physiosorption o Physical adsorption is a type of adsorption that occurs upon contact with a solid or liquid surface for most particles.
Chemical absorption is a process of chemical reaction between absorbing substances and absorbed substances, it occurs when molecules or atoms are absorbed.
Here are some points of difference between physical and chemical absorption.
|physical absorption||chemical absorption|
|It is a reversible absorption process.||It is an irreversible absorption process.|
|Balance is easily achieved||The balance is done gradually|
|Due to intermolecular van der Waal forces, physical absorption occurs||Due to the formation of chemical bonds, chemical absorption occurs|
|Low heat of adsorption||The heat of adsorption is very large|
|Decreases with increasing temperature||Increases with increasing temperature|
|Increased pressure increases adsorption||Pressure drop does not lead to desorption|
|It is easily adsorbed if the gases are easily liquefiable, it depends on the nature of the gas.||Significantly specific and depends on the nature of the adsorbent and the adsorbate|
|Multimolecular layers form on the surface of the adsorbent.||Unimolecular layers form on the surface of the adsorbent.|
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