Multilayer Adsorption of Slightly Soluble Organic Compounds from Aqueous Solutions

Adsorption isotherms are analyzed for slightly soluble organic components from water for a wide range of reduced concentrations. It is shown that the behavior of these systems can be modeled by an equation of the forma = Ac/[(1 +Bc)(1 −c/c0)d] over the range ofc/c0from about 0.05 to 0.9. Hereais the adsorption amount,cis the concentration of organic compound in the water,c0is a solubility limit for the organic compound, andA,B, anddare adjustable parameters. Comparison is made with experimental data for the adsorption ofn-caproic acid,n-valeric acid,n-amyl alcohol,n-butyl alcohol, aniline, cyclohexanol, and phenol from aqueous solutions on carbon adsorbents.