Preparation of new photo-crosslinked β-cyclodextrin polymer beads

Photo-crosslinkable groups were introduced to beta-cyclodextrin (beta-CyD) by the reaction of beta-cyclodextrins with isophorone diisocyanate and 2-hydroxyethyl acrylate to produce polysubstituted photo-crosslinkable beta-CyD (PS beta CyD). To yield PS beta CyD of a spherical shape, a suspension consisting of PS beta CyD and aqueous sodium alginate solution was added dropwise into an aqueous calcium chloride solution. Then, the PS beta CyD macromonomer was photo-crosslinked with ultraviolet radiation to obtain beta-CyD polymer beads. The physical properties of the highest quality polymer beads prepared were as follows: diameter (phi) 2.7 mm and compressive strength 6.5 MPa that showed 69% separation efficiency of phenol from the raw industrial 8.9 wt% phenolic waste water.