Direct Synthesis of Surface Molecularly Imprinted Polymers Based on Vinyl-SiO_2 Nanospheres for Recognition of Bisphenol A

摘要

Molecularly imprinted polymers (MIP) with high performance in selectively recognizing bisphenol A (BPA) were prepared by using a novel and facile surface molecular-imprinting technique. Vinyl-functionalized, monodispersed silica spheres were synthesized by a one-step emulsion reaction in aqueous solution. Then, BPA surface molecularly imprinted polymers (SMIP) were prepared by polymerization with 4-vinylpyridine as the functional monomer and ethylene glycol dimethacrylate as the crosslinker. Maximal sorption capacity (Q_(max)) of the resulting SMIP was up to 600 μmol g~(-1), while that of nonimprinted polymers was only 314.68 μmol g~(-1). Kinetic binding study showed that sorption capacity reached 70% of Q_(max) in 20 min and sorption equilibrium at 80 min. SMIP had excellent accessibility and affinity toward BPA, for the selectivity coefficients of SMIP for BPA in respect to phenol, p-tert-butylphenol, and o-phenylphenol were 3.39, 3.35, and 3.02, respectively. The reusage process verified the SMIP owning admirably stable adsorption capacity toward BPA for eight times.