Adsorptive Mechanism on Activated Carbon in the Liquid Phase. III. The Relationship between the Physical Constants of Organic Compounds and Their Adsorbabilities on Activated Carbon from an Aqueous Solution

In order to evaluate the adsorbability for a given activated carbon from a knowledge of the physical properties of the adsorbate, the partition coefficients (α) of 93 organic compounds between the solution and the adsorbed phases at an infinite dilution have been calculated and correlated with the various physical constants. For aliphatic monofunctional compounds, a good linear relationship is obtained between logα and the following physical constants: molecular weight, molar attraction constant, and modified organicity/inorganicity value. This indicates that these physical constants are useful for predicting the adsorbability of aliphatic monofunctional compounds and that a straight line represents the adsorption characteristics of a given activated carbon. The correlation coefficient between the logα value and the physical constants for multifunctional compounds is lower than that for monofunctional compounds. The adsorptive mechanism on activated carbon in an aqueous solution is discussed on the basis of the conclusion obtained in the previous paper.