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Preparation method of graphene modified glassy carbon electrode and application thereof

A glassy carbon electrode and graphene technology, applied in the field of electrochemistry, can solve the problems of strong lattice, defects, and high toxicity of graphene products, achieve high sensitivity and accuracy, shorten reaction time, and fast analysis speed

Inactive Publication Date: 2013-02-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some disadvantages in reducing graphene oxide with reducing agents: (1) The reducing agents used are hydrazines, phenols, etc. These organic reducing agents are highly toxic and do not meet the requirements of green chemistry; (2) The reaction takes too long Long, usually need to react for 12~24h; (3) Graphene products prepared by low-temperature hydrazine hydrate reduction method have strong lattice defects

Method used

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  • Preparation method of graphene modified glassy carbon electrode and application thereof
  • Preparation method of graphene modified glassy carbon electrode and application thereof
  • Preparation method of graphene modified glassy carbon electrode and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Preparation of graphene-modified glassy carbon electrode: (1) Add graphene oxide powder into distilled water for 90 minutes of ultrasonication to obtain a graphene oxide dispersion with a mass fraction of 0.5%;

[0035] (2) Clean the glassy carbon electrode, drop 10 μL of graphene oxide dispersion on the surface of the glassy carbon electrode, and let it dry;

[0036] (3) Using graphene oxide modified glassy carbon electrode as working electrode, in 0.3mol / L NaH 2 PO 4 Electrochemical reduction at constant potential in the buffer solution. Nitrogen gas was passed for 10 minutes before the reduction, potential: -1.0V, time: 90 minutes, and the graphene-modified glassy carbon electrode was obtained after the reduction was completed. The SEM image of the prepared electrochemically reduced graphene-modified glassy carbon electrode is shown in figure 1 As shown, it can be seen from the figure that graphene is successfully supported on the glassy carbon electrode, that is, ...

Embodiment 2

[0047]Preparation of graphene-modified glassy carbon electrode: (1) Add graphene oxide powder into distilled water for 90 minutes of ultrasonication to obtain a graphene oxide dispersion with a mass fraction of 0.5%;

[0048] (2) Clean the glassy carbon electrode, drop 10 μL of graphene oxide dispersion on the surface of the glassy carbon electrode, and let it dry;

[0049] (3) Using graphene oxide modified glassy carbon electrode as the working electrode, in 0.1mol / L NaH 2 PO 4 Electrochemical reduction at constant potential in the buffer solution. Nitrogen gas was passed for 10 minutes before the reduction, potential: -0.9V, time: 120min, and the graphene-modified glassy carbon electrode was obtained after the reduction was completed.

[0050] The established analytical method was used for the determination of monascus red pigment in beverage samples. Preparation of sample solution: take 2.5mL sample, add deionized water to make up to 25mL solution.

[0051] (1) Add Na to...

Embodiment 3

[0057] Preparation of graphene-modified glassy carbon electrode: (1) Add graphene oxide powder into distilled water for 90 minutes of ultrasonication to obtain a graphene oxide dispersion with a mass fraction of 0.5%;

[0058] (2) Clean the glassy carbon electrode, drop 10 μL of graphene oxide dispersion on the surface of the glassy carbon electrode, and let it dry;

[0059] (3) Using graphene oxide modified glassy carbon electrode as the working electrode, in 0.1mol / L NaH 2 PO 4 Electrochemical reduction at constant potential in the buffer solution. Nitrogen gas was passed for 10 minutes before the reduction, potential: -1.1V, time: 80 minutes, and the graphene-modified glassy carbon electrode was obtained after the reduction was completed.

[0060] The established analytical method was used for the determination of erythrosin in beverage samples. Preparation of sample solution: take 2.5mL sample, add deionized water to make up to 25mL solution.

[0061] (1) Add Na to the ...

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Abstract

The invention provides a preparation method of a graphene modified glassy carbon electrode and an application thereof. The preparation method comprises the steps of: (1) preparing an oxidized grapheme dispersion liquid; (2) cleaning up the glassy carbon electrode, dropping the oxidized grapheme dispersion liquid on the surface of the glassy carbon electrode and airing; (3) carrying out electrochemical reduction in a buffer solution by using an oxidized graphene modified glassy carbon electrode as a work electrode to obtain the graphene modified glassy carbon electrode; and detecting the work electrode of an oxidoreduction active pigment as the graphene modified glassy carbon electrode. The graphene modified glassy carbon electrode is prepared by electrochemical reduction of the oxidized graphene modified glassy carbon electrode. The method has the advantages of simpleness in operation, short detection time, sensitive response and good analyzing effect.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to a preparation method of a graphene-modified glassy carbon electrode and its application in electrochemical detection. Background technique [0002] Allura Red, chemical name: 6-hydroxy-5-(2-methoxy-4-sulfonic acid-5-methylphenyl)azonaphthalene-2-sulfonic acid disodium salt, is a water-soluble synthetic pigment. As a food additive, allura red pigment is often used in food production and processing. It can increase the appearance of food and improve people's appetite, but excessive use will have harmful effects on the human body. Therefore, my country has stipulated the use limit of allura red. It has been reported in the literature that high performance liquid chromatography is used to separate and detect allura red pigment, but the analysis cost is high, the price of liquid chromatography and daily maintenance are expensive, and the use of too many organic solvents is likely to ca...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48C01B31/04C01B32/19
Inventor 孔泳任晓琳谢爱娟罗士平陶永新
Owner CHANGZHOU UNIV
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