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Carbon nano fluorescent material suitable for seawater medium, preparation method and applications thereof

A technology of fluorescent materials and carbon nanometers, applied in luminescent materials, material analysis through optical means, nano-carbon, etc., can solve problems such as complex preparation and synthesis routes, complex components, and difficult degradation, and achieve good economic and social benefits. Preparation Simple method and stable fluorescence performance

Pending Publication Date: 2020-05-12
自然资源部天津海水淡化与综合利用研究所
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is: there are few fluorescent materials suitable for seawater medium in the prior art, and most of the existing fluorescent materials have condensed rings in their structures, which are not easy to degrade, have certain toxicity, and are expensive and other limitations, which are difficult to overcome The seawater system has high salinity, complex components, difficulties such as fluorescence characteristics, and there are problems such as complicated preparation and synthesis routes, and not being environmentally friendly.

Method used

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  • Carbon nano fluorescent material suitable for seawater medium, preparation method and applications thereof
  • Carbon nano fluorescent material suitable for seawater medium, preparation method and applications thereof
  • Carbon nano fluorescent material suitable for seawater medium, preparation method and applications thereof

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preparation example Construction

[0053] The present invention also provides the preparation method of above-mentioned carbon nanometer fluorescent material, wherein, comprise the following steps:

[0054] Step 1: Mix carbon source A and nitrogen source B into a solution;

[0055] Step 2: adding passivating agent to the mixture obtained in step 1;

[0056] Step 3: adding a pH regulator to the mixture obtained in step 2 to make its pH 2-12;

[0057] Step 4: heat-treating the mixture obtained in Step 3 to obtain the carbon nano fluorescent material;

[0058]Wherein, the ratio of the volume of the passivating agent to the sum of the mass of the carbon source A and the nitrogen source B is 1:15-3:1;

[0059] Preferably, the ratio of the volume of the passivating agent to the sum of the mass of the carbon source A and the nitrogen source B is 1:15-1.5:1.

[0060] Preferably, wherein, the pH regulator described in step 3 is selected from NaOH, KOH, HCl and H 2 SO 4 one or more of them.

[0061] Preferably, whe...

Embodiment 1

[0074] 1) Mix 5.1 g of monomeric citric acid and 1.7 g of ethylenediamine into a mixed solution and place it in a beaker;

[0075] 2) Passivate by adding 0.5mL of ammonia water to obtain a solution;

[0076] 3) adding HCl to the solution obtained in step 2 to adjust the pH value to 4;

[0077] 4) The solution obtained in step 3 was heated at 180° C. for 2 hours to obtain carbon nano fluorescent material A.

[0078] Use 3.5‰, 7‰, 14‰, 21‰, 28‰ and 35‰ NaCl solutions to prepare 0.1mg / L (on a dry basis) carbon nano-fluorescent material A solution, and the resulting solution is detected using a fluorescence spectrophotometer. Under the conditions of 2.5nm grating, 343nm excitation light and emission wavelength of 434nm, the obtained fluorescence spectrum is as follows figure 1 with figure 2 .

[0079] from figure 1 It can be seen that the fluorescence spectra of the prepared carbon nano-fluorescent material A in 3.5‰, 7‰, 14‰, 21‰, 28‰ and 35‰ NaCl solutions overlap each oth...

Embodiment 2

[0082] 1) 2.3 g of monomeric sodium citrate and 4.5 g of triethylamine are formulated into a mixed solution;

[0083] 2) Add 0.5mL of PEG200 for passivation to obtain a solution;

[0084] 3) adding KOH to the solution obtained in step 2 to adjust the pH value to 12;

[0085] 4) heating the solution obtained in step 3 at 160° C. for 8 hours to obtain carbon nano fluorescent material B;

[0086] Prepare 0.1mg / L (on a dry basis) carbon nano-fluorescent material B solution with seawater, test the fluorescent properties of the gained solution and seawater under the condition of 343nm excitation wavelength at a 5nm grating, such as Figure 4 As shown, the fluorescence intensity of the material was significantly higher than that of the seawater substrate, and the test was repeated after 24 hours, and the results obtained did not change significantly.

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Abstract

The invention provides a carbon nano fluorescent material suitable for a seawater medium. The carbon nano fluorescent material is prepared from the following raw materials: a carbon source A, a nitrogen source B and a passivator, wherein a mass ratio of the carbon source A to the nitrogen source B is 5:1-1:5, the carbon source A is one or more than two selected from a monomer citric acid, citrateand glucose, the nitrogen source B is one or more than two selected from ethylenediamine, triethylamine, glycine and urea, and the passivator is selected from ammonia water and / or polyethylene glycol.According to the invention, the carbon nano fluorescent material prepared by the method is not influenced by salinity and is stable in fluorescence property in a seawater medium, and the fluorescenceintensity of the obtained product under the same test condition is obviously higher than that of seawater; the prepared fluorescent material has no condensed ring, does not contain benzene ring, andis environment-friendly; and the preparation method of the carbon nano fluorescent material is simple, easy to implement and low in cost, and has good economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of seawater utilization and the field of fluorescent materials, in particular to a carbon nano fluorescent material suitable for seawater medium and its preparation method and application. Background technique [0002] With the development of the economy, the scarcity of freshwater resources has increasingly become an important factor restricting the sustainable and rapid development of the economy and society. The development of seawater utilization technologies such as seawater desalination and seawater circulation cooling is an effective means to alleviate the shortage of freshwater resources. [0003] In seawater utilization projects, how to conduct online, rapid and accurate monitoring of important parameters such as water treatment agent concentration and concentration ratio, and implement effective control is a key technical issue to maintain the stable operation of the system. It is an effective meth...

Claims

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Application Information

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IPC IPC(8): C09K11/06C09K11/65G01N21/64C01B32/15
CPCC09K11/06C09K11/65G01N21/643C01B32/15G01N2021/6439
Inventor 侯相钰焦春联崔振东焦燕孟晓丽高丽丽靳亚鹏尹建华王维珍
Owner 自然资源部天津海水淡化与综合利用研究所
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