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Preparation method for carbon quantum dot and mercury content detection method based on carbon quantum dot

A technology of carbon quantum dots and a detection method, applied in the field of mercury ion detection, can solve the problems of high equipment cost, complicated operation, environmental hazards, etc., and achieve the effects of high sensitivity, less spectral interference, and less environmental damage

Inactive Publication Date: 2018-05-08
广东盈峰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new method for preparing carbon quantum dots, and a mercury ion fluorescent probe detection method using the carbon quantum dots, to overcome the problems of high equipment cost, complicated operation, and environmental hazards in traditional mercury ion detection methods

Method used

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Examples

Experimental program
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Embodiment 1

[0029] This embodiment discloses a method for preparing carbon quantum dots, the specific steps are as follows:

[0030] 1) Preparation of NHY

[0031] Sodium citrate, ammonium bicarbonate, ethylenediamine are dissolved in deionized water to obtain solution A, wherein the molar ratio of sodium citrate, ammonium bicarbonate, ethylenediamine and deionized water is 1:2:5: 180; solution A was heated at 220 degrees for 10 hours to obtain solution B; solution B was transferred to a dialysis bag of 1000-3000Da, and dialyzed in deionized water for 48 hours; the dialyzed solution B was kept at -40 degrees Freeze for 12 hours, and obtain brown-black powder NHY after freeze-drying.

[0032] 2) Preparation of AMINO-NHY

[0033] Mix NHY and glycine obtained in step 1), dissolve them in deionized water, and obtain solution C, wherein the molar ratio of glycine, NHY, and deionized water is 5:1:120; Add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride to pH 5.5-8.5, stir for 72 h...

Embodiment 2

[0036] This embodiment discloses a method for preparing carbon quantum dots, the specific steps are as follows:

[0037] 1) Preparation of NHY

[0038] Glucose, urea, 1,2-propylenediamine were dissolved in deionized water to obtain solution A, wherein the molar ratio of glucose, urea, 1,2-propylenediamine and deionized water was 1:6:10: 1000; solution A was heated at 100 degrees for 20 hours to obtain solution B; solution B was transferred to a dialysis bag of 1000-3000Da, and dialyzed in deionized water for 24 hours; the solution B after dialysis was kept at -80 degrees Freeze for 4 hours, and obtain brown-black powder NHY after freeze-drying.

[0039] 2) Preparation of AMINO-NHY

[0040] Mix NHY and phenylalanine obtained in step 1) and dissolve them in deionized water to obtain solution C, wherein the molar ratio of phenylalanine, NHY, and deionized water is 2:1:50; at a temperature of 100 degrees Under conditions, add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydroch...

Embodiment 3

[0043]This embodiment discloses a method for preparing carbon quantum dots, the specific steps are as follows:

[0044] 1) Preparation of NHY

[0045] Ascorbic acid, ammonium bicarbonate, 1,3-propylenediamine are dissolved in deionized water to obtain solution A, wherein the molar ratio of ascorbic acid, ammonium bicarbonate, 1,3-propylenediamine and deionized water is 1: 2:3:50; solution A was heated at a constant temperature of 400 degrees for 4 hours to obtain solution B; solution B was transferred to a dialysis bag of 1000-3000Da, and dialyzed in deionized water for 72 hours; Freeze at -20°C for 48 hours, and obtain brown-black powder NHY after freeze-drying.

[0046] 2) Preparation of AMINO-NHY

[0047] Mix NHY and tryptophan obtained in step 1) and dissolve them in deionized water to obtain solution C, wherein the molar ratio of tryptophan, NHY, and deionized water is 10:1:5000; at a temperature of 50 degrees , add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochl...

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Abstract

The invention discloses a preparation method for a carbon quantum dot and a mercury content detection method based on the carbon quantum dot. A scheme is to first perform preparation of NHY, use the NHY to prepare an AMINO-NHY carbon quantum dot, and then use the carbon quantum dot to conduct mercury ion content detection. The carbon quantum dot prepared by the technical scheme has the advantagesof superior kinetic and thermodynamic properties, good physical and chemical stability, good water solubility, high light resistance, diversity of surface properties, less harm to environment, high sensitivity to mercury ions and the like; the mercury content detection method based on the carbon quantum dot has the advantages of high sensitivity, less spectral interference, low cost and the like.

Description

technical field [0001] The invention relates to the field of mercury ion detection, in particular to a method for detecting mercury ion content based on carbon quantum dots and a method for preparing the carbon quantum dots. Background technique [0002] Mercury ions are an important pollutant in the environment. They are mainly discharged into the environment in the form of inorganic cations. Mercury ions entering the water body are enriched by the biomagnification of the food chain and finally enter the human body. Therefore, trace amounts of mercury ions in the water body are also It will seriously endanger the health of organisms and humans. Mercury and its compounds pose serious hazards to human health, such as Minamata disease caused by industrial wastewater polluting water bodies with excess mercury. Therefore, the determination of mercury ions is an important item in environmental testing and analysis. At present, the determination methods of mercury ions mainly in...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/64
Inventor 谢广群肖研郭德音杨振雄
Owner 广东盈峰科技有限公司
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