Abstract
Adsorption from solution of a solute which is normally solid exhibits characteristics distinct from those exhibited by adsorption from completely or partially miscible liquid mixtures. In particular, the adsorption of solid solute apparently reaches a monolayer equivalent at a fairly low concentration, and the isotherms can generally be fitted by the Freundlich or Langmuir equation. The present paper shows that the recently formulated multilayer theory of adsorption from polymer solutions can be utilized to explain the above qualitatively. For favorable systems the theory even gives a quantitative fit to the observed isotherm, and this is illustrated with the literature data on adsorption of stearic acid to carbon blacks.
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