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Fluoride ion detection method based on fluorescent graphene quantum dots

A technology of graphene quantum dots and detection method, applied in the field of chemical detection, can solve problems such as no fluoride ion detection method, and achieve the effects of fast detection, simple operation and wide detection range

Inactive Publication Date: 2019-07-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no report on the detection method of fluoride ion based on fluorescent graphene quantum dots

Method used

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  • Fluoride ion detection method based on fluorescent graphene quantum dots
  • Fluoride ion detection method based on fluorescent graphene quantum dots
  • Fluoride ion detection method based on fluorescent graphene quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A fluoride ion detection method based on fluorescent graphene quantum dots, comprising the following steps:

[0024] (1) Dissolve 1 g of citric acid, 0.3 g of ethylenediamine and 0.1 g of phenylboronic acid in 10 ml of ultrapure water, and stir to obtain solution 1; solution 1 is heated to 200 °C at a heating rate of 5 °C / min for 5 h. ; Cool to room temperature to obtain a black-brown B,N-GQDs original solution; Dilute the B,N-GQDs original solution with ultrapure water to obtain a B,N-GQDs solution with a mass fraction of 0.0008%;

[0025] (2) The B,N-GQDs solution, the concentration of which is 10μmol / L Hg 2+ Ion (mercuric nitrate) aqueous solution and a series of different concentrations of fluoride ion (sodium fluoride) aqueous solution (specifically 0, 0.25, 0.50, 0.75, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 mmol / L), mix them separately at a volume ratio of 0.375:1:1, and measure the fluorescence spectrum of each mixed solution (see figure 1 ) fluoresc...

Embodiment 2

[0032] A fluoride ion detection method based on fluorescent graphene quantum dots, comprising the following steps:

[0033] (1) Dissolve 1 g of citric acid, 0.3 g of ethylenediamine and 0.1 g of phenylboronic acid in 10 ml of ultrapure water, and stir to obtain solution 1; solution 1 is heated to 160 °C at a heating rate of 5 °C / min for 7 h. ; Cool to room temperature to obtain a black-brown B,N-GQDs original solution; Dilute the B,N-GQDs original solution with ultrapure water to obtain a B,N-GQDs solution with a mass fraction of 0.0005%;

[0034] (2) The B,N-GQDs solution, the concentration of which is 20μmol / L of Hg 2+ Ionic (mercuric nitrate) aqueous solution and a series of different concentrations of F in the concentration range of 0 and 2-20 mmol / L - Ion (sodium fluoride) aqueous solution (0, 2.0, 5.0, 7.0, 10.0, 12.0, 15.0, 17.0, 20.0 mmol / L) was mixed separately according to the volume ratio of 0.375:1:1, and the fluorescence spectrum of each mixed solution was measur...

Embodiment 3

[0041] A fluoride ion detection method based on fluorescent graphene quantum dots, comprising the following steps:

[0042] (1) Dissolve 1 g of citric acid, 0.3 g of ethylenediamine and 0.1 g of phenylboronic acid in 10 ml of ultrapure water, and stir to obtain solution 1; solution 1 is heated to 240 °C at a heating rate of 5 °C / min for 3 hours. ; Cool to room temperature to obtain a black-brown B,N-GQDs original solution; Dilute the B,N-GQDs original solution with ultrapure water to obtain a B,N-GQDs solution with a mass fraction of 0.001%;

[0043] (2) The B,N-GQDs solution, the concentration of which is 5 μmol / L of Hg 2+ Ion (mercuric nitrate) aqueous solution and a series of different concentrations of F in the concentration range of 0 and 0.01-4 mmol / L - Ionic aqueous solutions (0, 0.01, 0.25, 0.50, 0.75, 1.0, 2.0, 3.0, 4.0 mmol / L) were mixed separately according to the volume ratio of 0.375:1:1, and the fluorescence spectrum of each mixed solution was measured (see Fi...

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Abstract

The invention discloses a fluoride ion detection method based on fluorescent graphene quantum dots. The detection method comprises the steps that (1) citric acid, ethylenediamine and phenylboric acidare dissolved in ultrapure water and heated up; and a B, N-GQDs solution is obtained after water diluting; (2) the B, N-GQDs solution, a Hg2 + ion aqueous solution and a series of fluoride ion aqueoussolutions are mixed, and the fluorescence intensity F of a fluorescence spectrum of each mixed solution is detected; and the fluoride ion concentration serves as an x-coordinate, and the corresponding fluorescence recovery rate serves as a y-coordinate, and a standard curve for detecting the fluoride ion is obtained by linear fitting; (3) the B, N-GQDs solution, the Hg2 + ion aqueous solution andthe fluoride ion aqueous solution to be detected are mixed to obtain a mixed solution to be detected; and (4) a fluorescence spectrum of the mixed solution to be detected is detected, the fluorescence recovery rate R is calculated, and the fluoride ion concentration in the mixed solution to be detected is obtained by substituting the standard curve. According to the fluoride ion detection methodbased on the fluorescent graphene quantum dots, a raw material is easy to obtain and cheap, the detection is fast, the operation is easy, the detection range is wide, and the detection lower limit islow.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and relates to a fluoride ion detection method based on fluorescent graphene quantum dots. Background technique [0002] Among the various anions, the fluoride ion (F - ) has attracted much attention due to its unique chemical properties. Physiologically, fluoride ion is an important component of teeth and bones, and is closely related to human life activities and tissue metabolism. Abnormal fluoride ion concentration can induce a variety of diseases, such as dental and bone fluorosis, stomach and kidney diseases, and even inability to Working and living independently; in the environment, metallurgical irrigation with fluoridated water, and use of fluoride-containing daily necessities (toothpaste, batteries, and air conditioners) contaminate soil and groundwater. Therefore, the quantitative detection of fluoride ions has important practical significance in both disease diagnosis and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/64G01N21/643G01N2021/6432
Inventor 袁才登杨盼星
Owner TIANJIN UNIV