what is adsorption
what is adsorption
Answers
Explanation:
Adsorption is mainly a
consequence of surface energy. Generally, the surface particles which can be exposed partially tend to attract other particles to their site. Interestingly, adsorption is present in many physical, natural, biological and chemical systems and finds its use in many industrial applications. We will learn about the concept in detail below.
QUESTION;
What is Adsorption?
Answer:
Adsorption is a process which involves the accumulation of a substance in molecular species in higher concentration on the surface.
If we look at Hydrogen, Nitrogen and Oxygen, these gases adsorb on activated charcoal. Meanwhile, we have to note that adsorption is different from absorption. The two processes involve totally different mechanisms.
For the adsorption process, two components are required,
Adsorbate:
Substance which is deposited on the surface of another substance. For example, H2, N2 and O2 gases.
Adsorbent:
Surface of a substance on which adsorbate adsorbs. For example, Charcoal, Silica gel, Alumina.
Types of Adsorption
On the basis of interaction forces between adsorbate and adsorbent, adsorption is of two types.
1) Physical adsorption:
This type of adsorption is also known as physisorption. It is due to weak Van der Waals forces between adsorbate and adsorbent.
For example, H2 and N2 gases adsorb on coconut charcoal.
2) Chemical adsorption:
This type of adsorption is also known as chemisorption. It is due to strong chemical forces of bonding type between adsorbate and adsorbent.
For example , the formation of iron nitride on the surface when iron is heated in N2 gas at 623 K.
Adsorption of gas on a solid is a spontaneous exothermic reaction. Amount of heat liberated when a unit mass of a gas is adsorbed on the surface is called heat of adsorption.