Abstract
The adsorption of quinoline and/or 8-hydroxyquinoline on charcoal was studied as a function of pH and concentration for the purpose of investigating the relationship between the pH at the adsorption maximum and the pKa, of the organic acid cation. Equations based on the theory of Langmuir were derived and tested experimentally. The pH/pKa, ratio was found to depend on the constants of the adsorption reaction as well as on the ratio of cation to neutral molecules on the surface at the adsorption maximum. Individual isotherms were calculated for the cation and for the neutral molecules. These were of type III for the cation and type I for the neutral molecules, thus indicating that adsorbate/adsorbate interactions are greater than adsorbate/adsorbent interactions for the cation molecules.
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