Abstract
A series of hydrophilic sorbents having amino groups was prepared by aminolysis of acrylonitrile-divinylbenzene copolymers with ethylenediamine and diethylenetriamine. The degree of transformation of nitrile groups was up to ca. 0.35. Sorption properties of the sorbents towards p-nitrophenol and methyl orange were compared. In both cases, the overall sorption capacity was found to be higher than for the parent acrylonitrile sorbents. The degree of sorption depended on both chemical and supermolecular structure and increased with specific surface area. The sorption of methyl orange was found to be related to the ion-exchange capacity of the sorbents, i.e., to their degree of chemical modification. In fact, the degree of sorption of the dye per ionic group was similar for all sorbents. For sorbents derived from the same parent copolymers, the effect of amino group basicity on degree of sorption was insignificant. The sorption of methyl orange was found to be controlled by internal diffusion with a diffusion coefficient lower by two to three orders of magnitude than those for porous ion exchangers.
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