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The theoretical underpinnings of the Freundlich adsorption isotherm, an often useful empiricism, are discussed. It is shown that the Freundlich expression does not originate from a true exponential distribution of energies of adsorption for the adsorption sites. However, at low solute concentration, a certain energy distribution which is semi-exponential in nature does lead to the Freundlich expression.
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David O. Cooney (1990) studied this question.
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