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Preparation method and application of Mn-doped ZnS quantum dot imprinted sensor

A quantum dot and sensor technology, applied in the field of environmental functional material preparation, can solve the problems of lack of universality and selectivity, low sensitivity, large workload, etc., and achieve the effects of improved sensitivity and selectivity, and good optical stability.

Inactive Publication Date: 2014-12-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the former detection process has a large workload, slow speed, and low sensitivity; the latter lacks certain universality and selectivity.

Method used

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  • Preparation method and application of Mn-doped ZnS quantum dot imprinted sensor
  • Preparation method and application of Mn-doped ZnS quantum dot imprinted sensor
  • Preparation method and application of Mn-doped ZnS quantum dot imprinted sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) In a 100 mL three-neck flask, add 1.797 g ZnSO 4 ·7H 2 O, 0.059 g MnCl 2 4H 2 O, 20 mL of distilled water, the resulting mixed solution was stirred at room temperature for 15 min under nitrogen, then 5 mL of 1.501 g Na 2 S·9H 2 O in water and stirred for 18 hours. Centrifuge to obtain Mn-doped ZnS quantum dots, wash with ethanol, and dry for later use. Then 1 g of the Mn-ZnS quantum dots prepared above was dispersed in 45 mL of toluene solution, and 1 mL of 3-(methacryloyloxy)propyltrimethoxysilane (KH570) was added dropwise under continuous stirring, and the temperature was raised to 90 o C reflux for 20 hours. Centrifuge to obtain KH570-modified Mn-doped ZnS quantum dots, wash with absolute ethanol, and dry for later use.

[0032] (2) In a 100 mL round bottom flask, add 55 mL solvent acetonitrile, followed by 0.1 mmol 2,6-dichlorophenol, 0.4 mmol MAA, 50 mg KH570 modified Mn-ZnS quantum dots, 1.2 mmol EDGMA, 10 mg AIBN is ultrasonically dissolved, sealed ...

Embodiment 2

[0035] (1) In a 100 mL three-neck flask, add 1.797 g ZnSO 4 ·7H 2 O, 0.118 g MnCl 2 4H 2 O, 20 mL of distilled water, the resulting mixed solution was stirred at room temperature for 30 min under nitrogen, then added 5 mL containing 1.501 g Na 2 S·9H 2 O in water and stirred for 24 hours. Centrifuge to obtain Mn-doped ZnS quantum dots, wash with ethanol, and dry for later use. Then 1 g of the Mn-ZnS quantum dots prepared above was dispersed in 55 mL of toluene solution, and 3 mL of 3-(methacryloyloxy)propyltrimethoxysilane (KH570) was added dropwise under continuous stirring, and the temperature was raised to 90 o C reflux for 24 hours. Centrifuge to obtain KH570-modified Mn-doped ZnS quantum dots, wash with absolute ethanol, and dry for later use.

[0036] (2) In a 100 mL round bottom flask, add 65 mL solvent acetonitrile, followed by 0.1 mmol 2,6-dichlorophenol, 0.8 mmol MAA, 200 mg KH570 modified Mn-ZnS quantum dots, 2.0 mmol EDGMA, 20 mg AIBN is ultrasonically dis...

Embodiment 3

[0039] (1) In a 100 mL three-neck flask, add 1.797 g ZnSO 4 ·7H 2 O, 0.1 g MnCl 2 4H 2 O, 20 mL of distilled water, the resulting mixed solution was stirred at room temperature for 20 min under nitrogen, then 5 mL of 1.501 g Na 2 S·9H 2 O in water, stirred for 20 hours. Centrifuge to obtain Mn-doped ZnS quantum dots, wash with absolute ethanol, and dry for later use. Then 1 g of the Mn-ZnS quantum dots prepared above was dispersed in 50 mL of toluene solution, and 2 mL of 3-(methacryloyloxy)propyltrimethoxysilane (KH570) was added dropwise under continuous stirring, and the temperature was raised to 90 o C reflux for 22 hours. Centrifuge to obtain KH570-modified Mn-doped ZnS quantum dots, wash with absolute ethanol, and dry for later use.

[0040] (2) In a 100 mL round bottom flask, add 60 mL solvent acetonitrile, followed by 0.1 mmol 2,6-dichlorophenol, 0.6 mmol MAA, 100 mg KH570 modified Mn-ZnS quantum dots, 1.6 mmol EDGMA, 15 mg AIBN is ultrasonically dissolved, se...

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Abstract

The invention relates to a preparation method and application of a Mn-doped ZnS quantum dot imprinted sensor and belongs to the technical field of environmental functional material preparation. The method comprises the steps of firstly stirring an aqueous solution of zinc sulfate heptahydrate and an aqueous solution of manganese chloride tetrahydrate at room temperature under the condition that nitrogen gas is introduced, and adding an aqueous solution of sodium sulfide nonahydrate, so as to obtain Mn-ZnS quantum dots; carrying out vinyl modification on the obtained Mn-ZnS quantum dots by using 3-(methacryloyloxy) propyl trimethoxysilane, then, synthesizing a Mn-doped ZnS quantum dot imprinted sensor, which takes 2,6-dichlorophenol as template molecules, methacrylic acid as functional monomers, Mn-ZnS-KH570 as auxiliary monomers, ethylene glycol di(methacrylate) as a cross-linking agent, 2,2-azodiisobutyronitrile as an initiator and acetonitrile as a solvent, by using a precipitation polymerization method through two-stage polymerization, and applying the Mn-doped ZnS quantum dot imprinted sensor to the optical detection on 2,6-dichlorophenol. The prepared phosphorescent molecular-imprinted polymer has very good optical and pH stability and has the capability of selectively identifying 2,6-dichlorophenol.

Description

technical field [0001] The present invention relates to a preparation method and application of a Mn-doped ZnS quantum dot imprinted sensor, in particular to a preparation method and application of a Mn-doped ZnS quantum dot phosphorescent 2,6-dichlorophenol molecular imprinted sensor. It belongs to the technical field of preparation of environmental functional materials. Background technique [0002] In the aquatic environment, phenols such as 3-chlorophenol, 2,6-dichlorophenol, 2,4,5-trichlorophenol and 2,4,6-trichlorophenol have been listed as priority pollutants. Chromatographic methods are mainly used for the analysis and detection of phenolic pollutants, such as liquid chromatography, gas chromatography and liquid chromatography-mass spectrometry. Chromatography has high recoveries, good reproducibility, and low detection limits, but requires tedious sample preparation. Commonly used sample pretreatment methods include solvent extraction technology, supercritical ext...

Claims

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Application Information

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IPC IPC(8): G01N21/64C08J9/28C08F220/06C08F2/44
Inventor 卫潇李洪吉徐叶青于志新周志平闫永胜
Owner JIANGSU UNIV
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