Transcript Adsorption - Groups Inc.

1. It is a surface phenomenon and refers to the
uniform distribution of a substance through
another at the surface e.g. solution of H2 in Pd.
2. It is the phenomenon in which a layer of ions,
molecules or aggregates of molecules condense
upon the surface with which they come in
contact.
3. It is defined as the concentration of a substance
at the interface or boundary between
heterogeneous phases e.g. solid/ gas or two
immisci.ble liquids
Adsorbate
 It is the substance which is adsorbed at
the surface of another substance
 Examples are: gases, dyes, water vapors
etc.
Adsorbent
 It is the substance which adsorbs the other
substance at its surface.
 Examples are: activated charcoal, bone
charcoal, alumina, silica gel, kaolin and
filler’s earth.
Order Of Adsorption
I. Liquid/ Solid adsorption
II. Solid/ Gas adsorption
III. Liquid/ Gas adsorption
IV. Liquid/ Liquid adsorption
Positive adsorption
Negative adsorption
Sorption
How adsorption occurs
Types of Adsorption
 Vander walls or physical adsorption
 Chemisorption
Factors effecting the
adsorption
 Solubility of adsorption
 Nature of Adsorbate
 Nature of adsorbent
 Concentration of adsorbent
 Pressure
 Temperature
 pH
 Affinity between adsorbent and adsorbate
 Stirring
Pharmaceutical Applications of
adsorption
1. Activated charcoal
2. Physiological Importance
3. Purification
4. Preparation of Vitamin B1
5. Gas masks
6. Heterogeneous Catalysts
7. Bacterial filtration
8. Solid-liquid chromatography
9. Emulsification
10.Decolonization
11.Adsorption of water vapors