Sorption of aromatic compounds on macroporous anion exchangers based on polyacrylamide: Relation between structure and sorption behavior

Abstract

AbstractThe sorption of phenol, p‐toluenesulfonic acid (p‐TSA), Na‐p‐toluenesulfonate (Na‐p‐TS), 1,2‐dihydroxy‐3,5‐benzene disulfonic acid disodium salt (Tiron), and 3‐hydroxy‐4(sulfonaphthyazo)‐5,7‐naphthalenedisulfonic acid trisodium salt (Poceau 4R) on the macroporus anion exchangers with acrylamide structural units (weak and strong basic anion exchangers) and on the ion exchangers with amidoxime groups were studied. The maximum specific sorption of p‐TSA was almost identical with the total exchange capacity for both the weak and strong basic anion exchangers. The sorption of Na‐p‐TS is strongly related to the functional group structure of the anion exchangers, being significant on the strong basic anion excahngers. The maximum specific sorption of Tiron was higher tan the total exchange capacity of the strong basic anion exchangers because it is mainly dependent on the ionic exchange properties. The morphological characteristics influenced only the establishement rate of the sorption equilibrium. The sorption of Ponceau 4R, which has the highest molecular weight, is important on the strong basic anion exchangers with high permanent porosity. The sorption of the organic anions is also dependent on the number of the sulfonic groups. © 1995 John Wiley & Sons, Inc.