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Nitrogen doped carbon nano ring and preparation method and application thereof

A nitrogen-doped carbon and nano-ring technology, which is applied in nano-carbon, nano-technology, nano-technology, etc., can solve the problems of restricting the popularization and application of carbon nano-materials, and the different fluorescence effects of carbon nano-materials, and achieve low cost and low cost of raw materials. The effect of small amount and broad application prospects

Active Publication Date: 2018-11-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of carbon nanomaterials usually needs to be carried out under harsh conditions such as pressure and microwave, which limit the popularization and application of carbon nanomaterials.
In addition, the fluorescence effects of carbon nanomaterials obtained by using different raw materials as carbon sources and different synthesis methods are quite different, and some even have no fluorescence.

Method used

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  • Nitrogen doped carbon nano ring and preparation method and application thereof
  • Nitrogen doped carbon nano ring and preparation method and application thereof
  • Nitrogen doped carbon nano ring and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (a) Take 0.25g of sodium citrate and urea of ​​different qualities and place them in a mortar for grinding to obtain a precursor mixture;

[0046] (b) Transfer the ground precursor mixture to a crucible and cover it with a lid; place the crucible in an oven and heat it to 200°C for 30 minutes;

[0047] (c) Comparative analysis of several groups of samples added with different quality urea, that is, the quality of urea is 0.25g; 0.50g; 1.0g; 1.25g; 1.5g;

[0048] (d) naturally cooling the reacted mixture to room temperature, i.e. 20-30° C., to obtain an initial reaction product;

[0049] (e) adding 20g of pure water to the initial reaction product for dissolution to obtain a suspension;

[0050] (f) filter the suspension with a molecular weight cut-off 3kDa cylindrical membrane separation filter, collect the filtrate, measure the fluorescence quantum yield of adding different quality urea, optimize adding different quality urea can draw when the addition is 1.0 g is th...

Embodiment 2

[0053] (a) Take 1.0 g of urea and sodium citrate of different qualities and place them in a mortar for grinding to obtain a precursor mixture;

[0054] (b) Transfer the ground precursor mixture to a crucible and cover it with a lid; place the crucible in an oven and heat it to 200 degrees Celsius for 30 minutes;

[0055] (c) Comparative analysis of several groups of samples added with different qualities of sodium citrate, that is, the quality of sodium citrate is 0.05g; 0.10g; 0.25g; 0.50g; 1.0g, etc.;

[0056] (d) naturally cooling the reacted mixture to room temperature, i.e. 20-30° C., to obtain an initial reaction product;

[0057] (e) adding 20g of pure water to the initial reaction product for dissolution to obtain a suspension;

[0058] (f) filter the suspension with a molecular weight cut-off 3kDa cylindrical membrane separation filter, collect the filtrate, measure the fluorescence quantum yield of adding different qualities of sodium citrate, optimize the addition ...

Embodiment 3

[0061] (a) Take 0.25g of sodium citrate and 1.0g of urea and place them in a mortar for grinding to obtain a precursor mixture;

[0062] (b) Transfer the ground precursor mixture to a crucible and cover it with a lid; place the crucible in an oven and heat it to 200 degrees Celsius;

[0063] (c) Compare and analyze several groups of samples with different reaction times, that is, the reaction time is 1min; 5min; 15min; 30min; 1h; 2h, etc.

[0064] (d) naturally cooling the reacted mixture to room temperature, i.e. 20-30° C., to obtain an initial reaction product;

[0065] (e) adding 20g of pure water to the initial reaction product for dissolution to obtain a suspension;

[0066] (f) Filter the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3kDa, collect the filtrate, and measure the fluorescence quantum yield at different reaction times. Fluorescence effects can also be obtained within a very short reaction time of 1min. The prod...

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Abstract

The invention provides a nitrogen doped carbon nano ring and a preparation method and an application thereof. The preparation method comprises the following steps: mixing a carbon source and a nitrogen source to obtain a precursor mixture; directly heating the precursor mixture, and reacting the mixture at a temperature at which the nitrogen source can be melted to obtain the nitrogen doped carbonnano ring; the nitrogen source is urea, and the carbon source is sodium citrate. The method of the invention is used for preparing nitrogen doped high-luminescence carbon nano ring, only one step reaction is required without high pressure, the reaction rate is super fast, and the by-products and intermediate products are very few, the amount of raw materials is very small, the proportion is random, the ratio is low, the fluorescence quantum yield is high, the obtained carbon nano ring has high luminous intensity and is successfully applied to Fe<3+> detection, in addition, the carbon nano ring can identify the acid-base value in a solution, and has broad application prospects for water treatment.

Description

technical field [0001] The invention relates to a nitrogen-doped carbon nano ring and its preparation method and application, belonging to the field of nano materials. Background technique [0002] Carbon is the basis of all known life on Earth and has played a pivotal role in the development of modern technology. Countless compounds of carbon are indispensable substances in everyday life, in products ranging from nylon and gasoline, perfume and plastics to shoe polish, DDT and dynamite, in a wide variety of products. Carbon has a variety of electronic orbital characteristics (sp, sp 2 and sp 3 ), so many substances with peculiar structures and properties can be formed, such as carbon nanotubes, fullerenes, nanodiamonds, graphene and graphene oxide, etc. [0003] In recent years, research on carbon nanomaterials is in full swing. As a new type of carbon nanomaterial, fluorescent carbon nanorings have excellent optical properties and low toxicity, making carbon nanorings t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15B82Y40/00B82Y30/00G01N21/64
CPCB82Y30/00B82Y40/00C01B32/15C01P2002/84C01P2002/85C01P2004/04G01N21/643
Inventor 徐泉苏日古
Owner CHINA UNIV OF PETROLEUM (BEIJING)