Resorcinol modified hypercrosslinked poly(styrene-co-divinlybenzene) resin and its adsorption equilibriums, kinetics and dynamics towards p-hydroxylbenzaldehyde from aqueous solution

摘要

A series of resorcinol modified hypercrosslinked poly(styrene-co-divinlybenzene) (PS) resins, named as HJ-HOO, HJ-H02, HJ-H05, HJ-H10 and HJ-H15, were synthesized from macroporous cross-linked chlorom-ethylated PS by adding 0%, 2%, 5%, 10% and 15% of resorcinol in the Friedel-Crafts reaction, and these resins were characterized and evaluated for adsorption of p-hydroxylbenzaldehyde from aqueous solution. The characterization indicated that these resins possessed different chemical structure and pore structure, indicative of their adsorption selectivity. HJ-H02 had the largest adsorption capacity towards p-hydroxylbenzaldehyde among the five resins and the mechanism was a combination of hydrogen bonding, micropore filling, capillary condensation and n-n stacking. Freundlich equation was suitable for fitting the equilibrium data and the isosteric adsorption enthalpies were applied to describe the surface energy heterogeneity of the resin. The pseudo-second-order rate equation-I was appropriate for the kinetic data and Thomas model was suitable for the dynamic data. The dynamic adsorption capacity was calculated to be 225.5 mg/g dry resin, very close to the equilibrium capacity of 241.4 rng/g and the resin column could be desorbed by 60 mL of 1% of sodium hydroxide and 75% of ethanol completely.