Adsorption

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The process of adsorption in the physical chemistry

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Adsorption

  1. 1. 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 immiscible liquids
  2. 2. Adsorbate It is the substance which is adsorbed at the surface of another substance Examples are: gases, dyes, water vapors etc.
  3. 3. 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.
  4. 4. Order Of Adsorption I. Liquid/ Solid adsorption II. Solid/ Gas adsorption III. Liquid/ Gas adsorption IV. Liquid/ Liquid adsorption
  5. 5. Positive adsorption Negative adsorption Sorption
  6. 6. How adsorption occurs
  7. 7. Types of Adsorption Vander walls or physical adsorption Chemisorption
  8. 8. 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
  9. 9. 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
  10. 10. Lecture by: Dr. Muhammad Akbar

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