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  • What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

5.5  What is an adsorption isotherm? Describe Freundlich adsorption isotherm. 

 

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 The adsorption isotherm is a relation curve between the variation in the amount of gas adsorbed by the adsorbent with pressure at a constant temperature.  

 

   Freundlich adsorption isotherm-  Freundlich gave an empirical relationship between the quantity of gas adsorbed by a unit mass of solid (adsorbent) and pressure (at a particular temperature).  

  •    At high pressure- \frac{x}{m}=k.p^{0} [independent of  P  ]  
  •    At intermediate pressure \frac{x}{m}=k.p^{\frac{1}{n}} for n>1  k  and  n  are constant (depend on nature of gas) Here  x  = mass of gas adsorbed, and  m  = mass of adsorbent at pressure  p   

   On taking log both sides-   

  \log\frac{x}{m}= \log(k)+\frac{1}{n}\log(p)  

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