β-Cyclodextrin-modified hybrid magnetic nanoparticles for catalysis and adsorption

Abstract

β-Cyclodextrin-modified hybrid magnetic nanoparticles (Fe₃O₄@SiO₂-PGMACD) were synthesized via the combination of atom transfer radical polymerization on the surfaces of silica coated iron oxide particles (Fe₃O₄@SiO₂) and ring-opening reaction of epoxy groups. The feasibility of using Fe₃O₄@SiO₂-PGMACD as separable immobilized catalyst and adsorbent was demonstrated. It was found: (1) the prepared Fe₃O₄@SiO₂-PGMACD could be used as catalyst in substrate-selective oxidation of alcohols system and the catalytic efficiency was close to pure β-Cyclodextrin of equal quantity; (2) the resulting particles appeared remarkably dominant adsorption capacity compared with poly(glycidyl methacrylate) grafted magnetic nanoparticles (Fe₃O₄@SiO₂-PGMA) in the removal of bisphenol A from aqueous solutions. The results suggest that the novel fabricated nanoparticles could serve as bifunctional materials in catalysis or adsorption and subsequently become potential multifunctional materials.