Encyclopedia of Membranes

2016 Edition
| Editors: Enrico Drioli, Lidietta Giorno

Freundlich Isotherm

Reference work entry
DOI: https://doi.org/10.1007/978-3-662-44324-8_254

A Freundlich isotherm is a mathematical expression for the adsorption equilibrium between a fluid (liquid or gas) and a solid material. The Freundlich equation is an empirical expression representing the isothermal variation of adsorption of a liquid or gas onto the surface of a solid material, derived by Freundlich (1909) as an empirical relation.

For adsorption of a gas as the adsorbate to a solid adsorbent, the following equation represents a Freundlich isotherm:
$$ \frac{x}{m}=k{P}^{\frac{1}{n}} $$
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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Chemical EngineeringProcess Engineering for Sustainable Systems (ProcESS), KU LeuvenLeuvenBelgium