Graphene/magnetic nanoparticle-modified electrode and its preparation method and use

A technology of magnetic nanoparticles and modified electrodes, which is applied in the field of food safety monitoring, can solve the problems of easy contamination of the electrode surface, short service life, and decreased sensitivity, and achieve the effect of accelerating electron transfer rate, improving detection sensitivity, and simple method

Inactive Publication Date: 2013-12-04
上海出入境检验检疫局工业品与原材料检测技术中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there have been many reports on the use of electrochemically modified electrodes to detect BPA, but the surface of the electrodes used in these methods is easily polluted, resulting in decreased sensitivity, short service life, and poor stability.

Method used

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  • Graphene/magnetic nanoparticle-modified electrode and its preparation method and use
  • Graphene/magnetic nanoparticle-modified electrode and its preparation method and use
  • Graphene/magnetic nanoparticle-modified electrode and its preparation method and use

Examples

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Embodiment 1

[0027] The preparation of embodiment 1 graphene

[0028] 100 g of graphene oxide powder was dispersed in 200 mL of double-distilled water, ultrasonicated for 3 hours in a sonicator, and then the unexfoliated blocky graphene was removed at a centrifugal speed of 3000 r, and then 200 μL of hydrazine hydrate and 3 mL of ammonia solution was stirred vigorously to obtain a uniformly dispersed solution; the solution obtained in the above steps was refluxed in an oil bath at 80°C for 12 hours, and the product was centrifuged and vacuum-dried to obtain graphene.

Embodiment 2

[0029] Embodiment 2 Preparation of graphene / magnetic nanoparticles

[0030] 200 mg of graphene, 344.4 mg of FeCl 2 ?4H 2 O, 561.9 mg of FeCl 3 Disperse in 200 mL of double-distilled water, add 1.5 mL, 10 mol / L sodium hydroxide to adjust the pH value of the solution to 11-12, then heat the solution to 80 °C and stir for 1 hour, the product is obtained by distilled water Washed twice with sub-distilled water, and finally dried in a vacuum oven at 60 °C to obtain graphene / magnetic nanoparticles.

Embodiment 3

[0031] Example 3 Preparation of Graphene / Magnetic Nanoparticle Modified Electrode

[0032] Pretreatment of the glassy carbon electrode: the glassy carbon electrode is based on the existing commercially available glassy carbon electrode, and the glassy carbon electrode is polished with alumina powder with a particle size of 0.05 μm, then rinsed with double distilled water, and then washed in acetone, nitric acid and Nitric acid solution with a water volume ratio of 1:1, 1 mol / L NaOH solution, and double-distilled aqueous solution were ultrasonically cleaned; acetone was analytically pure, and the nitric acid solution was a volume ratio of nitric acid to water of 1:1, and ultrasonically cleaned for 30 min , the ultrasonic condition was 40 kHz, 100 W, the glassy carbon electrode was used as the working electrode, the Ag / AgCl electrode was used as the reference electrode, and the platinum wire electrode was used as the auxiliary electrode.

[0033] After the graphene / magnetic nano...

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Abstract

The invention discloses a graphene / magnetic nanoparticle-modified electrode. The graphene / magnetic nanoparticle-modified electrode comprises graphene / magnetic nanoparticles and a glassy carbon electrode, wherein the glassy carbon electrode is used as a matrix and the graphene / magnetic nanoparticles are arranged on the glassy carbon electrode to modify the glassy carbon electrode. The invention also provides a preparation method of the graphene / magnetic nanoparticle-modified electrode and a use of the graphene / magnetic nanoparticle-modified electrode in bisphenol A detection. The graphene / magnetic nanoparticle-modified electrode has the advantages of fast response speed, wide linearity range and high sensitivity and is suitable for fast bisphenol A detection in the field of food safety and environmental health.

Description

technical field [0001] The technology relates to the technical field of food safety monitoring, in particular to the preparation and application of a graphene / magnetic nanoparticle modified electrode. Background technique [0002] Bisphenol A (BPA) is a typical environmental hormone widely found in food contact materials such as baby bottles, water bottles, and other food and beverage containers. The residual BPA in these products can be transferred to food or drink through direct contact, and then be ingested into the body, causing health hazards. In addition, BPA can also cause damage to the environment. Many literatures have reported that bisphenol A may migrate from plastic manufacturing plants or waste plastics to the environment and cause environmental pollution. Therefore, it is of great significance to establish a rapid, sensitive and accurate detection method for bisphenol A to protect the environment and protect people's health. [0003] At present, the detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 程欲晓杨勇周宇艳马腾洲张仪轩李冰玉顾玮史鑫浩鲜跃仲
Owner 上海出入境检验检疫局工业品与原材料检测技术中心
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