Preparation method for titanium dioxide nano particle fluorescence probe for detection DDT

Abstract

The invention discloses a preparation method for a titanium dioxide nano particle fluorescence probe for detection DDT. In the method, TiO2 is used as a core, and modified with 4-chloro-7-nitrobenzofuran fluorescence probe and aminopropyl functional groups on the surface, and at last quasi target molecules are printed on the surface, so that a silicon dioxide printed shell layer is formed. The preparation process of the fluorescence probe comprises three steps of 1, preparation of a fluorescence precursor; 2, silanization of the quasi target molecules, and 3, preparation and elution of the titanium dioxide nanoparticles printed with the quasi target molecules. The target molecule DDT enters a recognition site, a helium atom of the DDT and a hydrogen atom of aminopropyl form a hydrogen bond, so that the aminopropyl is stable, when in optical excitation, electrons of the nitrogen atom on the aminopropyl is prevented from being transferred to an NBD-APTS compound, fluorescence strength of the compound is enhanced according to a photoinduced electron transfer mechanism, recognition and detection of the DDT molecule are achieved by matching print sites and changing the fluorescence strength, photocatalysis of TiO2 is excited by changing an excitation wavelength, and thus degradation of the DDT molecule is achieved.

Description

technical field

[0001] The invention relates to the field of material science, in particular to a method for preparing a titanium dioxide nanoparticle fluorescent probe used for DDT detection. Background technique

[0002] In terms of safety, the use of pesticides has brought us great benefits, but it also poses a serious threat to our country's ecological environment and human health. In particular, pesticide residues in agricultural and animal husbandry products and food have chronic toxicity, direct poisoning, "three causes" (carcinogenic, teratogenic, mutagenic) effects and environmental hormone effects on the human body. Pesticide residues pose a long-term and serious threat to my country's food safety. The public's sense of safety for agricultural products and food has declined significantly, and it has also seriously affected the competitiveness of my country's agricultural products in the international market. Therefore, in recent years, the detection of trace pesti...

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