differences between absorption adsorption desorption and sorption?????????????
Answers
2) the substance getting absorbed is uniformly distributed throughout the bulk of the substance.
3) absorption proceed at a steady rate.
Adsorption ::: 1) it is a surface phenomenon.
2) adsorbate is accumulated at the surface.
3) the rate of adsorption is very rapid in the beginning. the rate however, decreases gradually until equilibrium is reached.
desorption::: the process of removal ( evolution ) of an adsorbed substance ( adsorbate ) from the surface of an adsorbent is known as desorption.
"Rate Of Adsorption = Rate Of Desorption "
Sorption ::: adsorption & absorption take place simultaneously & it is difficult to determine the relative extent of adsorption & absorption,.therefore, the term Sorption is widely used .
Difference between Adsorption and Absorption
Adsorption is the adhesion of molecules (or ions and atoms) to the surface of a solid or liquid. The molecules get accumulated only at the surface and do not enter the bulk of the adsorbing material.
The substance whose molecules get adsorbed at the surface is called the adsorbate.
The substance on whose surface the process takes place is called the adsorbent.
It is a surface phenomenon.
Adsorption examples
Alumina gel, silica gel, zeolites, activated carbon, graphite, finely divided metals, etc. are some examples of good adsorbents.
Desorption
Desorption is the reverse process in which the adsorbed substance is removed from the surface of the adsorbent.
Absorption:
Absorption is a physical or chemical phenomenon or a process in which atoms, molecules or ions enter some bulk phase – solid or liquid material. This is a different process from adsorption since molecules undergoing absorption are taken up by the volume, not by the surface. Adsorption is based on the surface where a film of adsorbate is developed on the surface, and absorption includes the complete volume of the absorbing agent