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Preparation and application of a nitrogen-doped cotton carbon fiber modified electrode

A technology for modifying electrodes and nitrogen doping, which is used in the fields of electrochemical variables of materials, material analysis by electromagnetic means, instruments, etc.

Active Publication Date: 2019-08-02
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports about nitrogen-doped cotton used in sensors, especially for superoxide anion sensors.

Method used

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  • Preparation and application of a nitrogen-doped cotton carbon fiber modified electrode
  • Preparation and application of a nitrogen-doped cotton carbon fiber modified electrode
  • Preparation and application of a nitrogen-doped cotton carbon fiber modified electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, preparation of modified electrode AgNPs / NCFs / GCE

[0032] (1) Preparation of nitrogen-doped cotton carbon fibers (NCFs): Put medical absorbent cotton in aqueous urea solution, ultrasonically disperse the cotton fully and evenly, keep it at 60-80°C for 20-24h, then place it in a tube furnace, N 2 Under protection, heat up to 700-800°C, calcinate for 2-3 hours, cool down to room temperature, and grind to obtain nitrogen-doped cotton carbon fiber NCFs;

[0033] (2) Pretreatment of the glassy carbon electrode: the glassy carbon electrode is polished into a mirror surface with 0.30 μm and 0.05 μm Al2O3 suspension in turn, and then ultrasonically cleaned with 95% ethanol and double distilled water , to obtain the treated glassy carbon electrode; then use the glassy carbon electrode as the working electrode, the platinum column as the counter electrode, and the saturated calomel electrode as the reference electrode in a three-electrode system, containing 0.1M of...

Embodiment 2

[0036] Example 2, modified electrode AgNPs / NCFs / GCE is used to detect O 2 •−

[0037] A nitrogen-doped cotton carbon fiber-modified electrode was used as the working electrode, a platinum column was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode to form a three-electrode system. 2 •− N 2 Saturated 0.2M pH=7.0 phosphate buffer solution is used as electrolyte for cyclic voltammetry scanning; O 2 •− The linear range of is divided into two segments:

[0038] When O 2 •− Concentration at 6.96×10 -15 ~7.37×10 -8 In the range of M, the response current Ip and O 2 •− The logarithm of the concentration has a good linear relationship, and its linear regression equation is: Ip (μA)=0.525 lg[O 2 •− ]+15.89, R 2 =0.9923;

[0039] When O 2 •− Concentration at 3.57×10 -7 ~7.22×10 -5 In the range of M, the response current Ip and O 2 •− The concentration is directly in a good linear relationship, and its linear regre...

Embodiment 3

[0040] Example 3, modified electrode AgNPs / NCFs / GCE is used to detect drug antioxidants to scavenge O 2 •− Ability

[0041] Add 1 × 10 to the PBS solution containing drug antioxidant -5 MO 2 •− , in a three-electrode system composed of a nitrogen-doped cotton carbon fiber modified electrode as the working electrode, a platinum column as the counter electrode, and a saturated calomel electrode as the reference electrode, the working potential was -0.5 V and was detected by chronoamperometry; the drug resistance The chronoamperometry of the current response after oxidant scavenging superoxide anion, the more the chronoamperometry of the current response decreases, the more the drug antioxidant scavenge O 2 •− The stronger the ability.

[0042] Used instrument and medicine in the implementation process of the present invention:

[0043] CHI 660C electrochemical workstation (Shanghai Chenhua Instrument Co., Ltd.) was used for cyclic voltammetry, linear sweep voltammetry, an...

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Abstract

The invention provides a preparation method of a nitrogen doped cotton carbon fiber superoxide anion electrochemical sensor. The preparation method of the nitrogen doped cotton carbon fiber superoxideanion electrochemical sensor comprises the following steps: taking cotton and urea as a precursor and carrying out carbonization and nitrogen doping to obtain a nitrogen doped cotton carbon fiber (NCFs) material; preparing the NCFs material into dispersion liquid and dropwise coating the surface of a glassy carbon electrode with the dispersion liquid; and further carrying out electro-deposition to obtain silver nano particles (AgNPs) to obtain the final modified electrode (AgNPs / NCFs / GCE). The modified electrode has good electrochemical response to O2--, and has the characteristics that the width of a linear range reaches 10 orders of magnitudes, the limit of detection is ultra-low (2.32* 10-15 M), the anti-disturbance performance is high, the stability and the repeatability are good andthe like; and moreover, the modified electrode is used for acquiring a satisfying result from electrochemical detection on superoxide anion removal ability of a drug antioxidant, and it shows that themodified electrode has good application prospect in bio-sensors, and is expected to be applied to detection of drug performance.

Description

technical field [0001] The present invention relates to the preparation of a superoxide anion electrochemical sensor, in particular to a method for preparing a nitrogen-doped cotton carbon fiber modified electrode; 2 •− )Applications. Background technique [0002] Reactive oxygen species (ROS) are important intracellular signaling molecules that mainly regulate protein synthesis, cell apoptosis, damage to biofilm systems, and intracellular oxidative phosphorylation disorders. Among them, the superoxide anion (O 2 •− ), as one of the most important and active ROS, is involved in many physiological and pathological processes. In recent years, O 2 •− The relationship between concentration and human health has attracted great attention. From the perspective of in vivo application, O 2 •− The linear range of dynamic detection is wide, not only in the molar concentration of millimolar and micromolar, but even needs to be extended to the molar concentration of nanomolar lev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333G01N27/30
CPCG01N27/308G01N27/333
Inventor 刘秀辉武调弟江雪婵宋光捷
Owner NORTHWEST NORMAL UNIVERSITY
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