Removal of bisphenol A from aqueous solution via host-guest interactions based on beta-cyclodextrin grafted cellulose bead.

β-CD grafted cellulose bead had been successfully prepared via dropping method, following by cross-linking reaction under mild conditions. The efficient grafting of β-CD on the cellulose bead made it promising adsorbent toward BPA, which combined the inclusion complexation property of β-CD and advantages of cellulose bead. The structure of the grafted cellulose bead was characterized by FTIR, XRD and 13C NMR, which confirmed the covalent bonding between cellulose bead and β-CD. The SEM and BET analysis revealed that the grafting of β-CD on the cellulose bead maintained the highly porous morphology of cellulose bead, meanwhile enhanced its specific surface area. Thus, the resulting modified cellulose bead presented much higher adsorption capacity toward BPA than pristine cellulose bead, since the presence of β-CD facilitated the formation of inclusion complexes via host-guest interactions. It was found that the maximum BPA adsorption capacity of grafted cellulose bead was 30.77 mg/g. The adsorption process fitted well with the Langmuir isotherm model and the pseudo-second-order kinetic model. Further studies of ad/desorption experiments revealed that the β-CD grafted cellulose bead could be regenerated easily in methanol. Based on these results, the adsorbents prepared here can be potentially used in the treatment of micropollutants in water.