Adsorption of sulfadiazine on novel bilayer porous resin: Synergism of micropore filling and anion exchange

A novel bilayer porous resin with micropore filling and anion exchange (PsCH 2 BP) was synthesized. The aim was to investigate the adsorption of sulfadiazine on PsCH 2 BP. The micropore area of PsCH 2 BP was reduced by 73.91 % after the adsorption of sulfadiazine. PsCH 2 BP exhibited the synergism of micropore filling and anion exchange in the adsorption of sulfadiazine. Within the pH range of 7.29–13.31, the adsorption capacity trend of sulfadiazine on PsCH 2 BP was consistent with its ionization curve of pka 6.48. The adsorption of sulfadiazine on PsCH 2 BP was endothermic, spontaneous, entropy increase and heterogeneous multilayer adsorption, reflecting the bilayer pore structure of PsCH 2 BP. 100 % C 2 H 5 OH and 4 % NaCl could desorb 75.13 % and 65.06 % of sulfadiazine adsorbed on PsCH 2 BP, respectively, reflecting the synergism of the micropore filling and anion exchange in the adsorption of sulfadiazine on PsCH 2 BP. 100 % of desorption ratio of sulfadiazine adsorbed by PsCH 2 BP was achieved with 4 mol/LNaOH.