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Preparation method of an ionic liquid-carbon dot, and method for detecting ferricyanide radical ion by using ionic liquid-carbon dot

An ionic liquid, ferricyanide technology, applied in measurement devices, instruments, fluorescence/phosphorescence, etc., can solve the problem of direct detection research not reported in literature, etc., and achieve the effects of good fluorescence performance, sensitive detection, and uniform dispersion.

Inactive Publication Date: 2017-11-21
苏州纳光材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, graphite rods have been electrolyzed in an ionic liquid-water homogeneous phase system to prepare luminescent carbon dots and develop Fe(CN) 6 3- No direct detection studies have been reported in the literature

Method used

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  • Preparation method of an ionic liquid-carbon dot, and method for detecting ferricyanide radical ion by using ionic liquid-carbon dot
  • Preparation method of an ionic liquid-carbon dot, and method for detecting ferricyanide radical ion by using ionic liquid-carbon dot
  • Preparation method of an ionic liquid-carbon dot, and method for detecting ferricyanide radical ion by using ionic liquid-carbon dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Electrochemical synthesis of ionic liquid-carbon dots:

[0043] Through a DC power supply, two graphite rods are respectively used as positive and negative electrodes, and a homogeneous system of ionic liquid ([BMIM]BF4) and water (V:V=3:7) is used as an electrolyte solution, and a voltage is applied to electrolyze the graphite rod. The electrolysis voltage is 8V, the electrolysis time is 3h, the solution gradually turns from colorless to yellow, and finally turns into dark reddish brown. Then the reaction product is diluted with an appropriate amount of distilled water, and the diluted solution is centrifuged in a centrifuge at a speed of 12000rpm for 15min, and then the collected reddish-brown supernatant is vacuum-filtered with a filter membrane with a pore size of 0.22 μm to obtain the ion Liquid - carbon dot mother liquor. The obtained ionic liquid-carbon dot mother solution is a light yellow solution under the irradiation of natural light, and emits blue fluoresc...

Embodiment 2

[0048] Fe(CN) 6 3- fluorescence detection

[0049] The ionic liquid-carbon dot mother liquor prepared in Example 1 was formulated into a uniformly dispersed aqueous solution, the pH of which was 4, and placed in 6 centrifuge tubes. Add 100 μL of ferricyanate aqueous solution with a known concentration of 0.1 to 180 μmol / L to it, react for 1 min, use a fluorescence spectrometer to measure the fluorescence intensity values ​​before and after adding ferricyanide, take the percentage of fluorescence intensity decrease as the ordinate, The concentration of ferricyanide is the abscissa, and the working curve is drawn. Then 100 μL Fe(CN) of unknown concentration 6 3- The sample solution is added to the ionic liquid-carbon dot aqueous solution, and the degree of fluorescence intensity reduction is measured, and the Fe(CN) in the measured sample is calculated according to the working curve. 6 3- The content was 113 μM.

[0050] Figure 7 For different pH values, the ionic liqui...

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Abstract

The invention discloses a preparation method of an ionic liquid-carbon dot, and a method for detecting the ferricyanide radical ion (Fe(CN)6<3->) by using the ionic liquid-carbon dot. According to the preparation method, through a direct current power supply, a graphite rod is used as an electrode, the homogeneous system of an ionic liquid [BMIM]BF4 and water is used as an electrolyte solution, a voltage is applied to perform electrolysis on the graphite rod, and the product is separated and purified to obtain the ionic liquid-carbon dot mother liquor after the electrolysis reaction is completed. According to the present invention, the prepared ionic liquid-carbon dot has advantages of uniform dispersion, uniform size and high fluorescence quantum yield, can emit blue fluorescence under the irradiation of an ultraviolet lamp, and can be used for the high-sensitivity detection of Fe(CN)6<3->.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, and in particular relates to a preparation method and application of an ionic liquid-carbon dot. Background technique [0002] Potassium ferricyanide is a toxic substance. Its aqueous solution will be decomposed into highly toxic cyanide under light or high temperature, or in a strong acid medium. It is harmful to the body after being ingested or absorbed through the skin, and can also damage Kidney, in a large amount, can even be fatal. Moreover, potassium ferricyanide can cause pollution to water bodies, and also has very serious harm to the environment. K 3 Fe(CN) 6 Easily reduced to K by light or other reducing agents in solution 4 Fe(CN) 6 , therefore, a facile, efficient, and sensitive method for the detection of Fe(CN) was able to be developed 6 4- or Fe(CN) 6 3- has important practical significance. [0003] Carbon dots are a kind of fluorescent nanoparticles that c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6428G01N2021/6432
Inventor 沈嘉炜奚凤娜刘吉洋梁立军
Owner 苏州纳光材料科技有限公司
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