Preparation method of SrAlB2O7:Eu<3+> fluorescent probe for detection of OPs (organophosphorus pesticides)

Abstract

The invention provides a preparation method of a SrAlB2O7:Eu<3+> fluorescent probe for detection of OPs (organophosphorus pesticides). The preparation method comprises two steps as follow: firstly, Eu<3+> and target analyte, OP molecules, interact to form organic ligand, then strontium nitrate, aluminum nitrate, boric acid and a pore-forming agent are added to a beaker accommodating deionized water, the mixture is stirred, and sol is formed; calcination is performed after gel is obtained, and Eu<3+> marked OP molecular printing SrAl2B2O7:Eu<3+> fluorescent probe is obtained. OP molecule selectivity recognition sites are available after template molecules are removed, the OP molecules further interact with Eu<3+> on the recognition sites after entering the recognition sites of the fluorescent probe, the OP molecules and the recognition sites form organic ligand, the organic ligand absorbs energy and transfers the energy to Eu<3+>, the fluorescence intensity of the fluorescent probe is changed, and selective recognition and detection of pesticide molecules are realized.

Description

technical field [0001] The invention relates to the field of material science, in particular to SrAl for the detection of organophosphorus pesticides 2 B 2 o 7 :Eu 3+ Methods for the preparation of fluorescent probes. Background technique [0002] In recent years, research on the detection of pesticides and related fluorescent probes has attracted widespread attention and interest from social research institutions, and some fruitful results have been achieved. Laboratory detection of specific pesticides has been widely used by methods such as spectroscopy, chromatography, and enzyme inhibition. These traditional analytical techniques can meet the basic requirements in analysis, such as selectivity, reliability, accuracy and reproducibility, but these detection methods are expensive, time-consuming and cumbersome, because the sample must be detached The detection site is sent to the laboratory for analysis, and real-time on-site detection cannot be achieved. In summary,...

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Problems solved by technology

Yao Fei from Northwest University in "Rare Earth Doped TiO 2 Preparation of Nanomaterials and Detection and Degradation of Chlorpyrifos", through the combination of nanotechnology and pesticide detection and treatment, the preparation of rare earth ion-doped titanium dioxide nanomaterials by liquid phase method, the study of rare earth Eu 3+ Doped titanium dioxide colloid was used as a fluorescent probe for the detection of pesticide chlorpyrifos residues, and the results showed that chlorpyrifos had an effect on Eu 3+ doped TiO 2 The fluorescence of nanocolloids has a quenching effect and conforms to the Stern-Volmer quenching equation, depending on the concentration of chlorpyrifos and Eu 3+ The fluorescence intensity of doped titanium dioxide is proportional to the establishment of a new method for rapid detection of pesticides, but this method also has shortcomings, that is, the accurate content of pesticide residues cannot be determined, and at the same time, there are too many factors affecting the fluorescence quenching, so through fluorescence quenching Extinction detection is not as strong as fluorescence enhancement detection target analyte exclusion interference

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