Preparation method of nanometer titanium dioxide artificial antibody shell for identifying and degrading chlorpyrifos

Abstract

The invention relates to a preparation method of a nanometer titanium dioxide artificial antibody shell layer for identifying and degrading chlorpyrifos. The preparation method comprises the following steps: firstly, preparing functionalized monodisperse polystyrene microspheres with rich carboxyl groups on the surfaces; subjecting the prepared functionalized monodisperse polystyrene microspheres with the carboxyl-rich surfaces to reacting with 3-aminopropyltriethoxysilane, chlorpyrifos and tetrabutyl titanate; conducting calcining to obtain a chlorpyrifos-molecularly-imprinted nanometer titanium dioxide artificial antibody shell; and eluting chlorpyrifos imprinted molecules in the nanometer titanium dioxide artificial antibody shell so as to allow a hole structure complementary with an imprinted molecular structure in size and in functional group to be formed in the shell layer. According to the invention, the shell layer of the nanometer titanium dioxide artificial antibody in which the imprinted molecule are eluted has the functions of specific recognition detection and degradation on a target analyte, namely chlorpyrifos molecules, and when the shell layer and the target analyte are close to each other in space, under the action of concentration difference driving force, specific recognition detection and degradation of the target analyte chlorpyrifos molecule can be realized.

Description

technical field [0001] The invention relates to the field of material science, in particular to a preparation method of a nano-titanium dioxide artificial antibody shell used for recognizing and degrading chlorpyrifos. Background technique [0002] Chlorpyrifos (CHL) is an organophosphate insecticide with low water solubility (1.39 mg / L). CHL produces toxic effects by inhibiting the activity of acetylcholinesterase. Therefore, it is very important to detect low concentrations of CHL in environmental waters. Based on the strong oxidation potential of hydroxyl groups formed on the catalyst surface, the photocatalytic degradation of titania can be expected to have very low selectivity. In fact, the rate of degradation was found to be very rapid for molecules that are quite adsorptive. The lack of selectivity for the type of pollutant appears to be beneficial. However, poor selectivity also means that photocatalysts cannot distinguish between highly hazardous pollutants and ...

AI Technical Summary

Problems solved by technology

"The artificial antibody prepared by it uses molecular imprinting technology, using paraquat as a template molecule, TEOS as a cross-linking agent, ammonia water as a catalyst, and reacting under alkaline conditions to prepare PS@SiO 2 Core-shell microspheres, the carboxyl-rich polystyrene microsphere "core" in the microspheres can specifically bind to paraquat molecules, increasing the binding sites and improving the detection efficiency, but it does not make polystyrene microspheres It has the function of a functional monomer, using a certain concentration of sodium hydroxide solution to adjust the pH value, so that the carboxyl groups on the surface of polystyrene microspheres become electronegativity, so that the positively charged paraquat molecules directly adhere to the polystyrene microspheres through static electricity. The surface of ethylene microspheres, this step process is more cumbersome

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