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Molecularly imprinted polymer based on core-shell quantum dot and application thereof

A core-shell quantum dot and molecular imprinting technology, which can be used in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of time-consuming and complicated operation, and achieve the effects of rapid recombination, improved detection efficiency, and good optical stability.

Inactive Publication Date: 2015-02-04
SOUTHWEST UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved in the present invention is to use CdTe / CdS core-shell quantum dots-PFOA imprinted polymer as a fluorescent probe to develop a fast, simple, sensitive and highly selective method for detecting perfluorooctanoic acid, and at the same time solve the cumbersome operation of previous methods , time-consuming and other issues

Method used

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  • Molecularly imprinted polymer based on core-shell quantum dot and application thereof
  • Molecularly imprinted polymer based on core-shell quantum dot and application thereof
  • Molecularly imprinted polymer based on core-shell quantum dot and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1 Preparation of core-shell quantum dot molecularly imprinted polymer

[0041] (1) Preparation of CdTe / CdS quantum dots: under a nitrogen atmosphere, weigh 0.0191 g of tellurium powder and excess sodium borohydride and add it to 10 mL of deionized water, and obtain colorless NaHTe after 2 hours; according to Cd 2+ : TGA: HTe molar ratio is 1: 2: 0.25, 0.1370 grams of CdCl 2 2.5H 2 O was added to 150 mL of deionized water, and 80 μL of thioglycolic acid was added as a stabilizer under stirring, and the pH was adjusted to 11 with sodium hydroxide drop by drop, and transferred to a three-necked flask; NaHTe was also transferred to a three-necked flask, and nitrogen gas was passed for 30 minutes , add 4mL of 0.5mol / L dilute sulfuric acid dropwise, under magnetic stirring, NaHTe reacts with dilute sulfuric acid to generate H 2 Te, H 2 Te reacts with the solution in the absence of oxygen to form a CdTe precursor; reflux at 96 °C for 2 hours in the absence of oxygen...

Embodiment 2

[0043] Example 2 Preparation and Characterization of CdTe / CdS Quantum Dots and Imprinted Polymers

[0044] 1. Spectrum of CdTe / CdS quantum dots

[0045] The highly luminous QDs synthesized by the present invention were characterized by fluorescence spectroscopy as follows: figure 1 shown. The ultraviolet-visible absorption spectrum shows that there is a strong exciton absorption in the ultraviolet absorption region, and the fluorescence emission peak is located at 590nm. It emits strong red fluorescence under ultraviolet light. The particle size of quantum dots can be obtained according to the following equation: D=(9.8127×10 -7 )λ 3 -(1.7147×10 -3 )λ 2 +1.0064λ-194.84; D is the particle size of QDs, and λ(nm) is the wavelength of the first exciton absorption peak of the corresponding sample. Accordingly, the particle size of CdTe / CdS QDs can be calculated to be 3.58nm.

[0046] 2. Characterization of MIP and NIP coated CdTe / CdS QDs

[0047] MIP-coated CdTe / CdS QDs we...

Embodiment 3

[0058] Embodiment 3 adopts polymer of the present invention to detect PFOA

[0059] Take tap water and Jialing River water respectively, after heating and boiling, filter with 0.22μm filter membrane three times. The content of PFOA in the sample was measured after the quantum dot-molecularly imprinted polymer was prepared according to the method of the embodiment of the present application, and the results are shown in Table 1. The experimental results showed that PFOS was not detected in the tap water samples and the Jialing River water samples. The recovery rate was between 91.0% and 107.0%, and the RSD was less than or equal to 5.61%.

[0060] The recovery rate determination (n=5) of PFOA in the table 1 sample

[0061]

[0062] a tap water; b Jialing River water (taken from the Beibei section of the Three Gorges reservoir area); MIP concentration: 0.03g / L; pH 3.8.

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Abstract

The invention belongs to the technical field of preparation of molecularly imprinting fluorescent probes and especially relates to a CdTe / CdS quantum dot-molecularly imprinting polymer (QDs-MIP) and an application of the QDs-MIP as a fluorescent probe in detection and analysis of perfluorooctanic acid. The invention aims to solve a technical problem of providing a quick, simple, sensitive and high-selective method for detecting the perfluorooctanic acid and provides a quantum dot surface perfluorooctanic acid molecularly imprinting polymer and an application thereof. The polymer is a fluorescent molecularly imprinting polymer which is prepared by embedding a molecular recognition site into the surface of a TEOS-coated CdTe / CdS quantum dot with the perfluorooctanic acid as a template molecule. The molecularly imprinting polymer is high in sensitivity, is simple in detection, is high in selectivity and affinity and can be directly applied in detection of the perfluorooctanic acid in environment. The molecularly imprinting polymer not only can reduce a detection cost but also can increase detection efficiency.

Description

technical field [0001] The invention belongs to the technical field of molecularly imprinted fluorescent probe preparation, in particular to a CdTe / CdS quantum dot-molecularly imprinted polymer (QDs-MIP), which is used as a fluorescent probe for the detection and analysis of perfluorooctanoic acid. Background technique [0002] Perfluorinated compounds are a new class of organic pollutants, which have excellent thermal stability, chemical stability, high surface activity and hydrophobic and oleophobic properties. Perfluorooctanoic acid (Pentadecafluorooctanoic Acid, PFOA) is its representative compound. Persistent organic pollutants PFOA, a widely used anionic surfactant, is one of the most difficult to degrade persistent organic pollutants. [0003] Due to the special structure and properties of fluorine, it is widely used in industrial production in industrial and civil fields. [0004] PFOA is persistent in the environment, has bioaccumulation in organisms, can be passed...

Claims

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Application Information

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IPC IPC(8): C08G77/26C08K3/30C08J9/26G01N21/64
Inventor 谭克俊郑永红郑莉龙莎
Owner SOUTHWEST UNIVERSITY
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