Highly selective molecularly imprinted layer-coated silica nanoparticles for bisphenol A (BPA) were
synthesized by molecular imprinting technique with a sol–gel process on the supporter of silica
nanoparticles. The BPA-imprinted silica nanoparticles were characterized by fourier transform infrared
spectrometer, transmission electron microscope, dynamic adsorption and static adsorption tests. The
equilibrium association constant, Ka, and the apparent maximum number of binding sites, Qmax, were
estimated to be 1.25 × 105 mL mol−1 and 16.4 mol g−1, respectively. The BPA-imprinted silica nanoparticles
solid-phase extraction (SPE) column had higher selectivity for BPA than the commercial C18-SPE
column. The results of the study indicated that the prepared BPA-imprinted silica nanoparticles exhibited
high adsorption capacity and selectivity, and offered a fast kinetics for the rebinding of BPA. The
BPA-imprinted silica nanoparticles were successfully used in SPE to selectively enrich and determine
BPA from shampoo, bath lotion and cosmetic cream samples.