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A molecularly imprinted polymer based on core-shell quantum dots and its application

A core-shell quantum dot and molecular imprinting technology, which is applied in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of cumbersome and time-consuming operations, and achieve the effects of improving detection efficiency, rapid recombination, and cost reduction.

Inactive Publication Date: 2017-01-25
SOUTHWEST UNIV +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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  • A molecularly imprinted polymer based on core-shell quantum dots and its application
  • A molecularly imprinted polymer based on core-shell quantum dots and its application
  • A molecularly imprinted polymer based on core-shell quantum dots and its application

Examples

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Embodiment 1

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

[0041] (1) Preparation of CdTe / CdS quantum dots: Weigh out 0.0191 g of tellurium powder and excess sodium borohydride and add them to 10 mL of deionized water in a nitrogen environment. After 2 hours, colorless NaHTe is obtained; according to Cd 2+ The molar ratio of TGA:HTe is 1:2:0.25, and 0.1370 grams of CdCl 2 ·2.5H 2 O was added to 150 mL of deionized water, 80 μL of thioglycolic acid was added as a stabilizer under stirring, and the pH was adjusted to 11 with sodium hydroxide dropwise, then transferred to a three-necked flask; NaHTe was also transferred to a three-necked flask, and nitrogen was blown for 30 minutes , Add 4mL 0.5mol / L dilute sulfuric acid dropwise, under magnetic stirring, NaHTe reacts with dilute sulfuric acid to produce H 2 Te, H 2 Te reacts with the solution in an oxygen-free state to form a CdTe precursor; TGA-CdTe QDs prepared by refluxing at 96°C for 2 hours without ox...

Embodiment 2

[0043] Example 2 Preparation and characterization of CdTe / CdS quantum dots and imprinted polymers

[0044] 1. The spectrum of CdTe / CdS quantum dots

[0045] The highly luminous QDs synthesized in the present invention were characterized by fluorescence spectroscopy, such as figure 1 Shown. The ultraviolet-visible absorption spectrum shows that there is 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 calculated 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. Based on this, the particle size of CdTe / CdS QDs can be calculated to be 3.58nm.

[0046] 2. Characterizing CdTe / CdS QDs coated with MIP and NIP

[0047] The preparation of MIP-coated CdTe / ...

Embodiment 3

[0058] Example 3 Using the polymer of the present invention to detect PFOA

[0059] The tap water and Jialing River water were heated and boiled, and then filtered three times with a 0.22μm filter membrane. The quantum dot-molecularly imprinted polymer was prepared according to the method of this application, and the content of PFOA in the sample was measured. The results are shown in Table 1. Experimental results showed that PFOS was not detected in tap water samples and Jialing River water samples. Through the standard addition recovery experiment, the recovery rate is between 91.0% and 107.0%, and the RSD is less than or equal to 5.61%.

[0060] Table 1 Determination of recovery rate of PFOA in samples (n=5)

[0061]

[0062] a Tap water; b Jialing River water (taken from Beibei section of the Three Gorges Reservoir); 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, and particularly relates to a CdTe / CdS quantum dot-molecularly imprinted polymer (QDs-MIP), which is used as a fluorescent probe for detection and analysis of perfluorooctanoic acid. Background technique [0002] Perfluorinated compounds are a new type 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 pollutant PFOA is a widely used anionic surfactant and one of the most difficult to degrade persistent organic pollutants. [0003] Due to its special structure and properties, fluorine is widely used in industrial production in industrial and civil fields. [0004] PFOA is persistent in the environment, bioaccumulative in organisms, can be transmitted along ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/26C08K3/30C08J9/26G01N21/64
Inventor 谭克俊郑永红郑莉龙莎
Owner SOUTHWEST UNIV
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