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What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

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Gaurav
askIITians Faculty 164 Points
9 years ago
Hello Student
As physical adsorption is reversible, it is accompanied by decrease in pressure. Therefore, it is expected that at a given temperature the extent of adsorption will increase with the increase of pressure of the gas.
The extent of adsorption is measured as x/m where m is the mass of adsorbent and x that of adsorbate.
If the physical adsorption is limited to unimolecular layer, the plot of x/m vs. equilibrium pressure at a constant temperature is as shown.

It is evident from the graph that at a certain pressure the adsorption reaches a maximum value i.e. the adsorption becomes saturated and the corresponding pressure is called saturation pressure (Ps). Beyond this pressure the adsorption remains constant.

255-205_Capture.PNG
Comparing the above given equation with equation of straight line
y = mx + c
we know that, if we plot log p vs log x/m, we would get a straight line with slope equal to 1/n and intercept log k.

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