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Polymer quantum dot capable of detecting heavy metal ions and preparation method thereof

A technology of heavy metal ions and polymers, applied in measurement devices, chemical instruments and methods, instruments, etc., can solve the problems of high biological toxicity, limitation, detection limitation of heavy metal ions, etc., and achieve low biological toxicity, low cost, and high selectivity. and sensitivity effects

Inactive Publication Date: 2017-06-27
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of quantum dots contains heavy metals and has high biological toxicity, so its application in cell imaging and cell detection is limited, and the synthesized polymer quantum dots are mostly coupled with biomolecules, which makes them limited in the detection of heavy metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a polymer quantum dot capable of detecting heavy metal ions, comprising the following steps:

[0031] Step 1: Add 0.05g OPD (o-phenylenediamine) into 10ml distilled water, and then ultrasonically dissolve to form a 50mM solution;

[0032] Step 2: Take 7ml of the above 50mM OPD solution, and then add 1.5ml of 5mM cysteine ​​solution;

[0033] Step 3: Add 4ml of 50mM perthionine solution to the above mixed solution, and then stir for 30s;

[0034] Step 4: Transfer the final mixture to the lining of a 25ml polytetrafluoroethylene-lined autoclave, and place the polytetrafluoroethylene lining in the steel jacket of the autoclave at 160°C heating for 12 hours;

[0035] Step 5: After the autoclave is cooled to room temperature, the product is centrifuged, and the supernatant is stored and diluted;

[0036] Step 6: Prepare 1×10 -9 Hg of M 2+ solution;

[0037] Step 7: Take the same volume of polymer quantum dot solution, and then add different volum...

Embodiment 2

[0040] A method for preparing a polymer quantum dot capable of detecting heavy metal ions, comprising the following steps:

[0041] Change o-phenylenediamine in embodiment 1 into 0.0216g m-phenylenediamine, change cysteine ​​into 2ml 0.02mol / L rhodamine B solution, reaction time and temperature are 24h under 180 ℃, prepare silver ion concentration 1×10 -8 M, with other conditions unchanged, the m-phenylenediamine-rhodamine B polymer quantum dots with an excitation wavelength of 475nm and an emission wavelength of 598nm can be obtained, which can detect silver ions with a detection limit of 1×10 -10 M.

Embodiment 3

[0043] A method for preparing a polymer quantum dot capable of detecting heavy metal ions, comprising the following steps:

[0044] Change the quality of o-phenylenediamine in Implementation 1 to 0.001g, change cysteine ​​to 0.001g m-phenylenediamine, do not add ammonium persulfate solution, and the reaction time is 24h at 200°C. Other conditions remain unchanged, and can be The o-phenylenediamine-m-phenylenediamine polymer quantum dot that emits blue-green under the ultraviolet light, the excitation wavelength is 356nm, and the emission wavelength is 460nm is obtained. The quantum yield is 0.92. The quantum dot can detect copper ions, and detect limited to 5×10 -14 M.

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Abstract

The invention provides a polymer quantum dot capable of detecting heavy metal ions. The polymer quantum dot is based on the principle that an amino group and a mercapto group coordinate metal ions to make polymer quantum dot fluorescence quenched or strengthened, a simple and low-cost high-temperature hydrothermal synthesis method is adopted, the biological toxicity of a polymer is low, the size is small, light is strong, and the polymer quantum dot has very high selectivity and sensitivity on heavy metal ions such as Hg<2+>, Cu<2+>, Cr<6+> and Ag<+>.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a polymer quantum dot capable of detecting heavy metal ions and a preparation method thereof. Background technique [0002] Quantum dots, especially polymer quantum dots, are widely used in cells due to their excellent luminescent properties, low cytotoxicity, good water solubility, stable fluorescence, high quantum yield, large Stokes shift and tunable emission wavelength. Imaging, cell detection, environmental detection, fluorescent probes and biosensors have a wide range of applications and have been extensively studied by researchers. However, the method of preparing polymer quantum dots is complicated, the quantum yield is low, and the polymer quantum dots contain heavy metal ions (Hg, Pb, Ag, Cd, Te), which makes them subject to many challenges in practical applications. limit. [0003] On the one hand, scientific researchers have done a lot of research on polymer q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06G01N21/64C08G75/04C08G73/02
CPCC08G73/02C08G73/026C08G73/0266C08G75/04C09K11/06C09K2211/1425G01N21/6428G01N21/6486
Inventor 廖钫宋珣杨思维赵世珍段丽萍
Owner CHINA WEST NORMAL UNIVERSITY
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