Freundlich adsorption isotherm Assignment Help

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The Freundlich adsorption isotherm

(i) The Freundlich adsorption isotherm is obeyed by adsorptions where the adsorbate forms the monomolecular layer on the surface of the adsorbent.

2310_Freundlich adsorption isotherm.png (Freundlich adsorption isotherm) or

2391_Freundlich adsorption isotherm1.png

here x is the weight of the gas adsorbed by m gm  of the adsorbent at a pressure p, thus x/m represents the amount of gas adsorbed by the adsorbents per gm  (unit mass), k and n are constant at a particular temperature and for a particular adsorbent and adsorbate (gas), n is always greater than one, indicating that the amount of the gas adsorbed does not increase as rapidly as the pressure.

(ii) At low pressure, the extent of adsorption varies linearly with pressure. 619_Freundlich adsorption isotherm2.png  

(iii) At high pressure, it becomes independent of pressure. 562_Freundlich adsorption isotherm3.png

1182_Freundlich adsorption isotherm4.png

(iv) At moderate pressure x/m depends upon pressure raised to powers 250_Freundlich adsorption isotherm.png

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