SORPTION OF AROMATIC-COMPOUNDS ON MACROPOROUS ANION-EXCHANGERS BASED ON POLYACRYLAMIDE - RELATION BETWEEN STRUCTURE AND SORPTION BEHAVIOR

The sorption of phenol, p-toluenesulfonic acid (p-TSA), Na-p-toluenesu lfonate (Na-p-TS), 1,2-dihydroxy-3,5-benzene disulfonic acid disodium salt (Tiron), and roxy-4(sulfonaphthylazo)-5,7-naphthalenedisulfonic a cid trisodium salt (Ponceau 4R) on the macroporous anion exchangers wi th acrylamide structural units (weak and strong basic anion exchangers ) and on the ion exchangers with amidoxime groups were studied. The ma ximum specific sorption of p-TSA was almost identical with the total e xchange capacity for both the weak and strong basic anion exchangers. The sorption of Na-p-TS is strongly related to the functional group st ructure of the anion exchangers, being significant on the strong basic anion exchangers. The maximum specific sorption of Tiron was higher t han the total exchange capacity of the strong basic anion exchangers b ecause it is mainly dependent on the ionic exchange properties. The mo rphological characteristics influenced only the establishment rate of the sorption equilibrium. The sorption of Ponceau 4R, which has the hi ghest molecular weight, is important on the strong basic anion exchang ers with high permanent porosity. The sorption of the organic anions i s also dependent on the number of the sulfonic groups. (C) 1995 John W iley and Sons, Inc.