Surface Functional Imprinting of Bensulfuron-methyl at Surface of Silica Nanoparticles Linked by Silane Coupling Agent

摘要

This article presents work on designing surface-imprinted core-shell nanoparticles via non-covalent interactions using bensulfuron-methyl (BSM) as the template and methacrylic acid as the functional monomer. About 3-(Trimethoxysilyl) propylmethacrylate (KH-570) functionalized SiO_2 nanoparticles were produced by sonochemical reaction. The grafting copolymerization of methacrylic acid and ethylene glycol dimethacrylate at the surface of KH-570 functionalized SiO_2 nanoparticles and in the presence of BSM as the template led to the formation of surface-imprinted core-shell nanoparticles. The core-shell nanoparticles were characterized, and their capacity to rebind BSM was analyzed. Results showed that the surface-imprinted core-shell nanoparticles binded the original template BSM with an appreciable selectivity over structurally related compounds. Compared to traditional imprinted particles, the density of effective imprinted sites in the nanoshells has been increased by four folds.