Synthesis And Characterization Of Dual-templates Imprinted Capsule For Paraoxon Degradation

Organophosphate compounds are the most widely used herbicide and insecticide in agriculture, their long-term accumulation in the environment will cause a very serious ecological threat to humans and other animals. Therefore, finding a clean technology to remove organophosphate compounds is very urgent. Paraoxon is a kind of organophosphate compounds common used, therefore, here we synthesized the clean materials by taking the paraoxon as the model molecule.Using zinc dimethacrylate as functional monomer, reactant paraoxon and product p-nitrophenol as template, divinylbenzene as cross-linking agent, monodisperse vinyl-bearing silica microsphere (v-SiO2) as core, reactant-product-dual-templates molecular imprinted polymer microspheres for degradation of paraoxon and elimination of p-nitrophenol were prepared by precipitation polymerization using one-step method or two-steps method, then the morphology and composition were characterized by TEM and FT-IR. The paraoxon-imprinted sites were acted as catalysis sites of paraoxon, the p-nitrophenol-imprinted sites were acted as adsorption sites of p-nitrophenol, and the void acted as two main rules, firstly it could adsorb a certain amount of p-nitrophenol, also it could lead to faster kinetics for the uptake of target species and improve the catalytic activity. Due to the synergistic-effect, experiences demonstrated that these hollow microspheres possessed high catalytic efficiency towards hydrolytic reaction of paraoxon and high adsorption capacity towards p-nitrophenol. Therefore, these hollow microspheres had excellent ability of degradation of paraoxon and elimination of p-nitrophenol.