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Method for preparing electrode modified by copper/graphene nanocomposite and application of modified electrode

A technology of nanocomposite materials and modified electrodes, which is applied in the field of preparation of copper/graphene nanocomposite modified electrodes, can solve problems such as high detection limit and narrow linear range, achieve low detection limit, wide linear range, and method simple effect

Inactive Publication Date: 2015-05-20
XI'AN PETROLEUM UNIVERSITY
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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 detection of ascorbic acid using electrochemically modified electrodes, but these methods have high detection limits and narrow linear ranges

Method used

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  • Method for preparing electrode modified by copper/graphene nanocomposite and application of modified electrode
  • Method for preparing electrode modified by copper/graphene nanocomposite and application of modified electrode
  • Method for preparing electrode modified by copper/graphene nanocomposite and application of modified electrode

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preparation example Construction

[0019] The preparation method of copper / graphene nanocomposite modified electrode comprises the following steps:

[0020] Step 1: Pretreatment of glassy carbon electrodes

[0021] Add water and aluminum powder to the glassy carbon electrode on the polishing cloth and grind it for about 3-5 minutes each time, then wash off the aluminum powder on the surface of the electrode, and place the glassy carbon electrode in a numerically controlled ultrasonic cleaner for 4-8 minutes to get the treatment Good glassy carbon electrode;

[0022] Step 2: Preparation of reduced graphene

[0023] Weigh 600mg graphene oxide and disperse it in 600mL~1000mL water, vibrate ultrasonically for 1h~2h, then add 6g~8g hydrazine hydrate, stir and reduce in 80℃ water bath for 10h~12h, then filter the reaction product with 20μm pore size filter membrane , and then rinsed with an appropriate amount of absolute ethanol for 1 to 2 times, then washed with a large amount of distilled water, and dried in vacu...

Embodiment 1

[0029] The preparation of the modified electrode comprises the following steps:

[0030] Step 1: Pretreatment of glassy carbon electrodes

[0031] Add water and aluminum powder to the glassy carbon electrode on the polishing cloth and grind it for about 3 minutes each time, then wash off the aluminum powder on the surface of the electrode, place the glassy carbon electrode in a numerically controlled ultrasonic cleaner for 8 minutes, and get the treated glassy carbon electrode;

[0032] Step 2: Preparation of reduced graphene

[0033] First prepare graphene oxide, then prepare reduced graphene

[0034] Graphite oxide was prepared by the improved Hummers method. In an ice bath, 10 g of graphite powder and 5 g of sodium nitrate were slowly added to 230 ml of concentrated sulfuric acid and mixed evenly. Slowly add 30g KMnO while stirring 4 . It was transferred to a 35 °C water bath for 30 min. Gradually add 460mL deionized water, further dilute to 3.5L with water, add 30% H...

Embodiment 2

[0040] Current Response of Glassy Carbon Electrode Modified by Copper / Graphene Nanocomposite to Ascorbic Acid

[0041] Determination of the relationship between the concentration of ascorbic acid and the response current of a copper / graphene nanocomposite modified glassy carbon electrode: linear sweep voltammetry with a scan rate of 0.02 V s -1 , The scanning range is 0.6~-0.2V. With the glassy carbon electrode as the working electrode, a certain amount of ascorbic acid was added to 20mL of PBS solution with pH 2.0, the experimental results are as follows figure 2 As shown, the oxidation peak current increases with the increase of the concentration of ascorbic acid, further ascorbic acid concentration c and oxidation peak current I P curve, the result is as image 3 .

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Abstract

The invention discloses a method for preparing an electrode modified by a copper / graphene nanocomposite and an application of the modified electrode. The method comprises the following steps: placing a reduced graphene water solution at the centre of a glassy carbon electrode; drying with an incandescent lamp, and loading graphene to the surface of the glassy carbon electrode to prepare a glassy carbon electrode modified by graphene; in a Na2SO4 solution, by taking the glassy carbon electrode as a working electrode, a platinum wire electrode as an auxiliary electrode, and a saturated calomel electrode as a reference electrode, setting the scanning rate of an electrochemical workstation as 0.1V*s<-1> and circularly scanning for 15 circles in the voltage range from 0.6 to -0.6V to prepare the glassy carbon electrode modified by the copper / graphene nanocomposite. The prepared glassy carbon electrode is used for detecting the concentration of ascorbic acid. According to the method and the application, the copper / graphene nanocomposite is simply and quickly modified to the electrode, thus the sensing area and conductive capacity of the electrode are increased, the transfer of the electrode surface electron is accelerated and excellent electro catalytic oxidation is achieved for ascorbic acid.

Description

technical field [0001] The invention relates to the technical field of medicine and food safety monitoring, in particular to a preparation method and application of a copper / graphene nanocomposite modified electrode. Background technique [0002] Ascorbic acid, also known as vitamin C, is an essential nutrient for higher primates and a few other organisms. In organisms, vitamin C is an antioxidant that protects the body from the threat of free radicals, and it is also a coenzyme. Ascorbic acid is metabolically produced in most living organisms, but humans are the most notable exception. The most widely known is that a lack of vitamin C causes scurvy. Humans rely on the intake of fresh fruits to supplement the vitamin C needed by the human body. Therefore, it is of great significance to establish a rapid, sensitive and accurate detection method for ascorbic acid to protect human health. [0003] At present, the determination of ascorbic acid mainly adopts fluorescence meth...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 孟祖超薛丹雷盼盼吴坤坤王博
Owner XI'AN PETROLEUM UNIVERSITY
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