SORPTION OF AROMATIC-AMINES ON A NEW LIGAND EXCHANGER OF SPOROPOLLENIN-BOUND CO2+ ION

The mechanism of ligand-exchange sorption of aromatic amines such as p -chloroaniline, p-toluidine, and p-nitroaniline as ligands on a Co2+-l oaded ligand exchanger has been studied. The observed rate seems to be related to the rate of ligand sorption with the mobile phase and pH i n the aqueous phase. The saturation capacity and binding constant of l igand sorption on the resin increase with increasing basicity of amine s. The rate of attainment of equilibrium sorption of aromatic amines i s seen to be nearly similar. Coupled with the fact that different conc entrations of solution were employed, these results may be interpreted as indicating that particle diffusion is the rate-controlling step. O n the contrary, film diffusion was not rate-controlling step in the li gand sorption process under the conditions employed. It is shown that the kinetic parameters measured in single component experiments provid e good prediction behavior. The pH dependencies and sorption isotherms of aromatic amines on the resins were also studied.