ADSORPTION CHARACTERISTICS OF ALKYLBENZENE SULFONATES ON MODIFIED STYRENE-DIVINYLBENZENE COPOLYMERS AND THEIR APPLICATION

Two series of macroreticular resins having 1-oxoalkyl and 1-hydroxyalkyl groups were prepared and their adsorption behavior of dodecylbenzenesulfonate (DBS) was investigated by the batch operation. Although the specific surface areas of the both types of the resins were somewhat similar or smaller than that of the starting styrene-divinylbenzene resin (7.5 V% divinylbenzene), the adsorption capacities for DBS were markedly increased with the introduction of the functional groups. The resins having the shortest alkyl chain (P-COCH3, P-CH(OH)CH3) showed the highest adsorption capacity among the resins in each type of the resin. The increase of the capacity was observed in the presence of sodium chloride, but the presence of methanol strongly reduced the adsorption. More than 95% of the DBS adsorbed on a column of the modified resins could be recovered with ethanol. Applicability of these resins for pre-concentration of linear alkylbenzenesulfonate in environmental specimen was also examined.