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A preparation method of fluorescent carbon quantum dots using urine as raw material

A technology of carbon quantum dots and urine, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems of complex preparation methods and expensive raw materials, and achieve the effects of good light stability, simple equipment, and rich sources of raw materials

Active Publication Date: 2017-03-22
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art, to solve the technical problems of high raw material prices and complicated preparation methods of carbon quantum dots, and to provide a method for preparing fluorescent carbon quantum dots that turns waste into treasure

Method used

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  • A preparation method of fluorescent carbon quantum dots using urine as raw material
  • A preparation method of fluorescent carbon quantum dots using urine as raw material
  • A preparation method of fluorescent carbon quantum dots using urine as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Take 20 mL of human urine and filter it with a 0.22 μm filter membrane to obtain sterile urine;

[0023] (2) Put the above urine into a polytetrafluoroethylene-lined hydrothermal reaction kettle, place it in a blast drying oven at 200°C for 1 hour, and obtain a yellow solution;

[0024] (3) inject the solution obtained in step (2) into a dialysis bag (500 Da of cellulose acetate dialysis bag) after centrifugation to remove large particles and carry out dialysis. The dialysis time is 48 hours, and the water is changed every 6 hours;

[0025] (4) The dialysis product is subjected to rotary evaporation to obtain a concentrated solution;

[0026] (5) Freeze-dry the concentrated solution at -50° C. to powder to obtain fluorescent carbon quantum dots with a quantum yield of about 3.68%.

Embodiment 2

[0028] (1) Take 20 mL of human urine and filter it with a 0.22 μm filter membrane to obtain sterile urine;

[0029] (2) Put the above urine into a polytetrafluoroethylene-lined hydrothermal reaction kettle, place it in a blast drying oven at 200°C for 2 hours, and obtain a brownish-yellow solution;

[0030] (3) inject the solution obtained in step (2) into a dialysis bag (500 Da of cellulose acetate dialysis bag) after centrifugation to remove large particles and carry out dialysis. The dialysis time is 48 hours, and the water is changed every 6 hours;

[0031] (4) The dialysis product is subjected to rotary evaporation to obtain a concentrated solution;

[0032] (5) Freeze-dry the concentrated solution at -50° C. to powder to obtain fluorescent carbon quantum dots with a quantum yield of about 15.68%.

Embodiment 3

[0034] (1) Take 20 mL of human urine and filter it with a 0.22 μm filter membrane to obtain sterile urine;

[0035] (2) Put the above urine into a polytetrafluoroethylene-lined hydrothermal reaction kettle, place it in a blast drying oven at 200°C for 4 hours, and obtain a brownish-yellow solution;

[0036] (3) inject the solution obtained in step (2) into a dialysis bag (500 Da of cellulose acetate dialysis bag) after centrifugation to remove large particles and carry out dialysis. The dialysis time is 48 hours, and the water is changed every 6 hours;

[0037] (4) The dialysis product is subjected to rotary evaporation to obtain a concentrated solution;

[0038] (5) Freeze-dry the concentrated solution at -50° C. to powder to obtain fluorescent carbon quantum dots with a quantum yield of about 15.52%.

[0039] Carry out characterization to embodiment sample

[0040] Utilize the fluorescence spectrophotometer to characterize the fluorescence emission spectrum of the carbon q...

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Abstract

Disclosed is a preparation method for fluorescent carbon quantum dots by taking urine as a raw material. The method mainly includes the steps: taking the urine as a predecessor; taking a water and heat reaction kettle as a reaction platform; performing dialyzing, freezing and drying to remove residues and moisture to obtain fluorescent carbon quantum powder by the aid of high-temperature and high-pressure water and heat reaction. The preparation method is simple in preparation process, the raw material does not need any costs and can turn waste into treasure, and the fluorescent carbon quantum dots are easily produced and popularized on a large scale. The carbon quantum dots prepared by the method have the advantages of excellent fluorescence performance, high light stability, fine water solubility and biological compatibility and the like and have wide application prospects in the fields such as biological sensors, biological imaging and optoelectronic devices.

Description

technical field [0001] The invention relates to a method for preparing fluorescent carbon quantum dots using urine as a raw material, and belongs to the technical field of nanomaterials. Background technique [0002] Quantum dots (quantum Dots, QDs) generally refer to semiconductor nanocrystals with a radius smaller than or close to the laser Bohr radius, nanometer-sized particles with unique optoelectronic properties. Traditional semiconductor quantum dots have the advantages of strong photochemical stability, high fluorescence intensity, and adjustable fluorescence spectrum, and have been applied in the fields of light-emitting devices, biomarkers, and biosensors. The potential harm of environmental pollution limits its wide application. In recent years, carbon quantum dots (carbon dots, CDs particle size <10nm) have been successfully applied in biological imaging, optoelectronic devices, Biosensors and photocatalysis and other fields, and gradually become a research ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65
Inventor 王勇庄欠粉倪永年
Owner NANCHANG UNIV
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