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A kind of preparation method of carbon nitride quantum dot

A technology of quantum dots and carbon nitride, which is applied in the field of material preparation, can solve the problems of restricting mass production and application of products, unsatisfactory uniformity, and low yield of preparation technology, and achieves low cost, good dispersion, and water solubility. good sex effect

Inactive Publication Date: 2016-02-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2005, Vinu et al. ("Preparation and characterization of well-ordered hexagonal mesoporous carbonnitride" Adv Mater, 2005, 17: 1648) used mesoporous silicon oxide SBA-15 as a hard template to prepare carbon nitride MCN-1 with an ordered mesoporous structure, but porous g-C 3 N 4 After synthesis, the hard template needs to be removed, often requiring the use of highly toxic HF or NH 4 HF 2 , more harmful to the human body
[0007] It can be seen that many raw materials can be used to prepare carbon nitride quantum dots. The raw materials used involve the use of ethylenediamine, N,N-dimethylformamide, Organic amines, chitosan, EDTA, urea, sodium citrate and even block g-C3N4, the carbon nitride quantum dots also show strong application potential , but the size uniformity of the "quantum dots" obtained by the above preparation method is not ideal, and the size range is large (5-80nm), so it is generally called nano-dots, and the average diameter of quantum dots is generally less than 10nm; in addition, due to the use of raw materials Most of them are small molecules, so the yield of existing preparation technology is low, generally no more than 50%, which limits the mass production and application of products

Method used

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  • A kind of preparation method of carbon nitride quantum dot
  • A kind of preparation method of carbon nitride quantum dot
  • A kind of preparation method of carbon nitride quantum dot

Examples

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Embodiment 1

[0026] The preparation method of the carbon nitride quantum dot of the present embodiment comprises the following steps:

[0027] (1) Material preparation: Weigh 1 g of melamine and 3 g of sodium chloride crystals (that is, the mass ratio of melamine and sodium chloride crystals is 1:3), and dissolve melamine and sodium chloride crystals in 30 g of deionized water;

[0028] (2) Drying and tableting: Freeze-dry the aqueous solution obtained in step (1) at -30°C for 24 hours to constant weight, place it in a mold, and press it into a sheet with a thickness of 1cm under a pressure of 10MPa using a tablet press;

[0029] (3) Heating: Put the sheet obtained in step (2) in a porcelain boat, place it in a tube furnace, pass nitrogen gas at a flow rate of 5ml / min, raise the temperature to 600°C at a rate of 10°C / min and keep it warm for 2h , cooled to room temperature with the furnace;

[0030] (4) Separation: Grind the product obtained in step (3) for 20 minutes in a mortar, then di...

Embodiment 2

[0034] The only difference from Example 1 is that the mass ratio of melamine and sodium chloride crystals in this example is 1:1, that is, 1 g of melamine and 1 g of sodium chloride crystals are weighed in step (1), and the melamine and sodium chloride crystals are weighed Dissolved in 10g of deionized water, step (4) was also dissolved in 10g of deionized water, the others were the same as in Example 1.

[0035] The diameter of the nitrided quantum dots obtained in this example is 5-16nm (8.8nm on average), and the specific surface area is 300m 2 / g, the productive rate is 92wt%.

Embodiment 3

[0037] The only difference from Example 1 is that the mass ratio of melamine and sodium chloride crystals in this example is 1:5, that is, 1 g of melamine and 5 g of sodium chloride crystals are weighed in step (1), and the melamine and sodium chloride crystals are weighed Dissolved in 50g of deionized water, step (4) was also dissolved in 50g of deionized water, the others were the same as in Example 1.

[0038] The diameter of the nitrided quantum dots obtained in this example is 4-13nm (7.3nm on average), and the specific surface area is 310m 2 / g, the productive rate is 94wt%.

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Abstract

A method for preparing carbon nitride quantum dots, comprising the following steps: (1) material preparation; (2) drying and tableting; (3) heating; (4) separation; (5) drying. The template used in the present invention is a sodium chloride crystal, the preparation process is simple, the cost is low, and it can be easily dissolved and removed with water; using melamine as a raw material, the melamine molecule itself has a ring-shaped carbon nitride basic structural unit to prepare quantum dots High yield, good uniformity of product size; the prepared quantum dots have high specific surface area, good water solubility, good dispersibility, strong fluorescent radiation visible to the naked eye, and have a wide range of applications in fluorescence detection, light-emitting devices, biomarkers and other fields prospect.

Description

technical field [0001] The invention relates to a method for preparing carbon nitride quantum dots, in particular to a method for preparing graphite phase carbon nitride (g-C 3 N 4 ) The quantum dot method belongs to the field of material preparation. Background technique [0002] Carbon nitride is composed of two elements, carbon and nitrogen. It has abundant reserves, wide sources, simple synthesis method, good economy and easy access. Graphite carbon nitride (g-C 3 N 4 ) is a narrow bandgap semiconductor with a bandgap width of about 2.7eV, non-toxic, and metal-free. At the same time, g-C 3 N 4 It also has good mechanical properties, thermal stability, acid and alkali corrosion resistance (good stability in aqueous solutions with pH from 0 to 14), strong oxidation ability and high electron transfer rate. Based on the above advantages, g-C 3 N 4 It is a new type of visible light catalyst, which can be used in photocatalysis, electrocatalysis, organic oxygenation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082
Inventor 楚增勇原博蒋振华李公义王璟胡天娇王春华李义和王清华王孝杰
Owner NAT UNIV OF DEFENSE TECH