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

[Display omitted] •A novel bilayer porous resin with micropore filling and anion exchange.•The synergism of micropore filling and anion exchange was observed.•100 % of desorption ratio for sulfadiazine was achieved with 4 mol/LNaOH. A novel bilayer porous resin with micropore filling and anion exchange (PsCH2BP) was synthesized. The aim was to investigate the adsorption of sulfadiazine on PsCH2BP. The micropore area of PsCH2BP was reduced by 73.91 % after the adsorption of sulfadiazine. PsCH2BP 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 PsCH2BP was consistent with its ionization curve of pka 6.48. The adsorption of sulfadiazine on PsCH2BP was endothermic, spontaneous, entropy increase and heterogeneous multilayer adsorption, reflecting the bilayer pore structure of PsCH2BP. 100 % C2H5OH and 4 % NaCl could desorb 75.13 % and 65.06 % of sulfadiazine adsorbed on PsCH2BP, respectively, reflecting the synergism of the micropore filling and anion exchange in the adsorption of sulfadiazine on PsCH2BP. 100 % of desorption ratio of sulfadiazine adsorbed by PsCH2BP was achieved with 4 mol/LNaOH.