Which of the following isotherm is applicable to physical adsorption?a)Langmuirb)BETc)Freundlichd)KisluikCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

The Freundlich isotherm was the first isotherm model proposed for sorption processes. It can be applied for non ideal sorption on heterogeneous surfaces, as well as, multilayer sorption. A variation in the slope between 0 and 1 is associated with a chemisorption process, which is more heterogeneous as the value gets closer to 0. Due to the lack in fundamental thermodynamic basis, since there is no approach to Henry’s law at vanishing concentrations, this represents a limitation of this isotherm model.

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