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Nitrogen-doped fluorescent carbon quantum dot, and preparation method and application thereof

A carbon quantum dot, nitrogen doping technology, applied in fluorescence/phosphorescence, chemical instruments and methods, nano-optics, etc., can solve the problem of detecting less nitrite ions, etc., and achieves simple and safe preparation method, excellent fluorescence effect, dispersion uniform effect

Pending Publication Date: 2019-08-06
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fluorescent carbon quantum dots have been widely used for the detection of metal ions, but there are very few reports on the detection of nitrite ions

Method used

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  • Nitrogen-doped fluorescent carbon quantum dot, and preparation method and application thereof
  • Nitrogen-doped fluorescent carbon quantum dot, and preparation method and application thereof
  • Nitrogen-doped fluorescent carbon quantum dot, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of nitrogen-doped fluorescent carbon quantum dots, m-phenylenediamine is added to ethanol for dissolution to obtain a 0.05mol / L ethanol solution of m-phenylenediamine, and the ethanol solution of m-phenylenediamine is moved into polytetrafluoroethylene Stainless steel high-pressure reaction kettle, placed in an oven to heat the reaction, the reaction temperature is 120 ° C, the reaction time is 12 hours, the reaction product is centrifuged to take the supernatant, and then the supernatant is filtered with a 0.22 μm microporous membrane, and then the processed product is Ethanol was removed by rotary evaporation at a temperature of 40° C., then ultrasonically dispersed in an appropriate amount of distilled water, and finally freeze-dried to obtain fluorescent carbon quantum dot powder.

Embodiment 2

[0038] A preparation method of nitrogen-doped fluorescent carbon quantum dots, adding o-phenylenediamine to ethanol for dissolution to obtain a 1mol / L ethanol solution of o-phenylenediamine, and moving the o-phenylenediamine ethanol solution into polytetrafluoroethylene stainless steel The high-pressure reaction kettle is placed in an oven to heat the reaction. The reaction temperature is 165°C and the reaction time is 8 hours. Ethanol is removed by rotary evaporation at a temperature of 50°C, then ultrasonically dispersed in an appropriate amount of distilled water, and finally freeze-dried to obtain fluorescent carbon quantum dot powder.

Embodiment 3

[0040] A preparation method of nitrogen-doped fluorescent carbon quantum dots, adding p-phenylenediamine to ethanol for dissolution to obtain a 2mol / L ethanol solution of p-phenylenediamine, and moving the p-phenylenediamine ethanol solution into polytetrafluoroethylene stainless steel The high-pressure reaction kettle is placed in an oven to heat the reaction. The reaction temperature is 200°C and the reaction time is 6 hours. Ethanol was removed by rotary evaporation at a temperature of 55°C, then ultrasonically dispersed in an appropriate amount of distilled water, and finally freeze-dried to obtain fluorescent carbon quantum dot powder.

[0041] Prepare a disodium hydrogen phosphate-citrate buffer solution with pH=2, weigh the nitrogen-doped fluorescent carbon quantum dots prepared in Example 1, dissolve them in ultrapure water, and accurately prepare a 0.1 mg / mL carbon quantum dot storage solution . Then take out 300 μL of the above-mentioned carbon quantum dot solution ...

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Abstract

The invention discloses a nitrogen-doped fluorescent carbon quantum dot, and a preparation method and an application thereof. The preparation method comprises the following steps: phenylenediamine isadded to ethanol, and is dissolved to obtain an ethanol solution of phenylenediamine, the ethanol solution of phenylenediamine is transferred into a polytetrafluoroethylene stainless steel autoclave,the autoclave is placed in an oven, the solution is heated and reacted, the obtained reaction product is centrifuged, the obtained supernatant is taken, and is filtered by a filter membrane, ethanol is removed from the treated product, the obtained product is dispersed in an appropriate amount of distilled water, and the obtained solution is freeze-dried to obtain a fluorescent carbon quantum dotpowder. The method has the advantages of simplicity in operation, low price and good repeatability; and the prepared nitrogen-doped fluorescent quantum dot has the advantages of high light stability,good water solubility, good selectivity, and realization of sensitive and specific detection and analysis of nitrites.

Description

technical field [0001] The invention belongs to the field of preparation of new nanometer materials, and in particular relates to a nitrogen-doped fluorescent carbon quantum dot and its preparation method and application. Background technique [0002] Nitrite (NO 2 - ) mainly refers to sodium nitrite and potassium nitrite, which are white to light yellow powder or granules with slightly salty taste and easily soluble in water. Appearance and taste are similar to table salt. Widely present in natural water, soil and food, such as leafy vegetables, pickled meat, and many Chinese medicinal materials contain high levels of nitrite. [0003] Nitrite is a toxic substance, ingestion of 0.3-0.5g of nitrite can cause poisoning or even death. The reason why nitrite causes acute poisoning in the human body is that it can oxidize the normal ferrous iron in the hemoglobin molecule in the human body to ferric iron. Oxygen symptoms, which are often referred to as methemoglobinemia. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/643G01N2021/6432
Inventor 薛伟明李文帅黄赛朋周鑫温惠云
Owner NORTHWEST UNIV(CN)
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