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Carbon quantum dot and preparation method and application thereof

A carbon quantum dot and reaction technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of complex operation, high energy consumption, unsuitable for industrial production, etc., and achieve simple reaction process , reduce production costs, improve the effect of friendliness

Inactive Publication Date: 2018-07-24
NORTHEAST FORESTRY UNIVERSITY
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  • Description
  • Claims
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Problems solved by technology

[0003] Chinese patent CN102504815A discloses a method for preparing carbon quantum dots whose emission color is adjustable with the excitation wavelength based on thermal decomposition of emulsion colloidal particles. The method first needs to prepare an emulsion precursor with a suitable particle size, and then use the emulsion precursor as a raw material Synthesis of carbon quantum dots requires a high-temperature calcination process, which is complex in operation and high in energy consumption, and is not suitable for industrial production

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  • Carbon quantum dot and preparation method and application thereof
  • Carbon quantum dot and preparation method and application thereof
  • Carbon quantum dot and preparation method and application thereof

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preparation example Construction

[0025] The invention provides a kind of preparation method of carbon quantum dots, comprising the following steps:

[0026] Mixing glucose, heteropoly acid and water to obtain a reaction mixture;

[0027] The reaction mixture is subjected to hydrothermal reaction to obtain carbon quantum dots.

[0028] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0029] The invention mixes glucose, heteropoly acid and water to obtain a reaction mixture. In the present invention, the heteropoly acid preferably includes one or more of Keggin type heteropoly acid, Dawson type heteropoly acid, absence type heteropoly acid and substitution type heteropoly acid; more preferably Keggin type heteropoly acid Polyacid, Dawson type heteropolyacid, vacancy type heteropolyacid and substitution type silicotungstic acid, silicomolybdic acid, phosphotungstic acid, phosphomolybdic acid, vanadium...

Embodiment 1

[0052] Add 50mL of water to the mixture of 0.1g of anhydrous glucose and 0.1g of 12-phosphotungstic acid, and sonicate for 30min to obtain a reaction mixture;

[0053] The reaction mixture was added into a 100 mL polytetrafluoroethylene autoclave, heated to 190° C. at a heating rate of 5° C. / min, and hydrothermally treated for 10 hours. Naturally cool the reactor to room temperature, extract the product three times with ether, filter the obtained water phase through a filter membrane with a pore size of 0.22 μm, and then dialyze the filtrate with a dialysis membrane with a molecular weight cut-off of 1000 Da for 72 hours, and replace the water every 12 hours . Dry the dialyzed liquid at 70° C. until completely dry to obtain carbon quantum dots.

[0054] By transmission electron microscopy detection of the carbon quantum dots, as figure 1 As shown, the size range of the above-mentioned carbon quantum dots is 4.5-6.2nm;

[0055] By testing the fluorescence emission of the car...

Embodiment 2

[0058] Add 50mL of water to the mixture of 1g of anhydrous glucose and 1g of 12-phosphotungstic acid, and sonicate for 30min to obtain a reaction mixture;

[0059] The reaction mixture was added into a 100 mL polytetrafluoroethylene autoclave, heated to 170° C. at a heating rate of 5° C. / min, and hydrothermally treated for 10 hours. Cool the reaction kettle to room temperature naturally, extract the product repeatedly with ether three times, filter the obtained water phase through a filter membrane with a pore size of 0.22 μm, and then dialyze the filtrate with a dialysis membrane with a molecular weight cut-off of 1000 Da for 72 hours, and replace it every 12 hours water. Dry the dialyzed liquid at 70° C. until completely dry to obtain carbon quantum dots.

[0060] Through transmission electron microscopy (TEM) detection of the carbon quantum dots, such as image 3 As shown, the size range of the above-mentioned carbon quantum dots is 5.2-6.5nm;

[0061] By testing the flu...

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Abstract

The invention provides a carbon quantum dot preparation method which comprises the following steps: mixing glucose, heteropoly acid and water to obtain reaction mixed liquid; performing hydrothermal reaction on the reaction mixed liquid to obtain carbon quantum dots. According to the carbon quantum dot preparation method disclosed by the invention, the glucose and the heteropoly acid are utilizedas raw materials; the raw materials have the advantages of environmental friendliness, low cost and easiness in being obtained; production cost is reduced, and environmental friendliness is improved at the same time; meanwhile, the hydrothermal reaction is utilized to perform carbonization, a reaction process is simple, and industrial production can be achieved. The particle size of the carbon quantum dots prepared by the preparation method disclosed by the invention is 4 to 8nm, and the carbon quantum dots can give blue and green fluorescence under ultraviolet light. According to the carbon quantum dot preparation method disclosed by the embodiment of the invention, a degradation rate of the carbon quantum dots to organic pollutants can reach 87.4% or more.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a carbon quantum dot and its preparation method and application. Background technique [0002] Carbon quantum dots are a new type of carbon nanomaterials with a diameter of less than 10nm, quasi-spherical shape, and monodisperse. Due to their excellent water solubility, chemical inertness, low toxicity, easy functionalization and photobleaching resistance, carbon quantum dots have gradually become a A new star in the family of carbon nanomaterials has been used in photocatalysis, detection probes, bioimaging, light-emitting diodes, and drug delivery. Among them, the fluorescence property is the most prominent feature of carbon quantum dots. However, carbon quantum dots synthesized from different raw materials by different preparation methods have different structures and properties. So far, the fluorescence mechanism of carbon quantum dots is still controversial, and the...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00B01J21/18B01J37/08B01J37/10
CPCC09K11/65B82Y20/00B82Y40/00B01J21/18B01J37/084B01J37/10B01J35/23B01J35/39
Inventor 刘守新李伟刘禹杉马春慧罗沙
Owner NORTHEAST FORESTRY UNIVERSITY
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