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Three-dimensional porous carbon/polythionine compound modified electrode, and production method and application thereof

A three-dimensional porous and modified electrode technology, which is applied in the field of chemical analysis and detection, can solve the problems of time-consuming operation and complexity, and achieve the effect of maintaining stability, good adsorption capacity, and accelerating the electron transfer rate

Active Publication Date: 2018-08-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can detect metronidazole sensitively, they are relatively time-consuming and complicated to perform

Method used

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  • Three-dimensional porous carbon/polythionine compound modified electrode, and production method and application thereof
  • Three-dimensional porous carbon/polythionine compound modified electrode, and production method and application thereof
  • Three-dimensional porous carbon/polythionine compound modified electrode, and production method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of three-dimensional porous carbon / polythionine composite modified electrode

[0040] S1: Preparation of anodized electrode

[0041] Use 0.5μm Al on polishing nap pads 2 o 3 The polishing powder is used to polish the glassy carbon electrode with a diameter of 2 mm. After polishing, it is rinsed with ultrapure water, and then ultrasonically cleaned in ethanol and water in sequence.

[0042] The electrolytic cell is filled with a phosphate buffer solution with a concentration of 0.1mol / L and a pH of 7.0. The above-mentioned treated glassy carbon electrode is used as a working electrode, a platinum wire electrode is used as an auxiliary electrode, and a saturated calomel electrode is used as a reference electrode. On the electrochemical workstation, run for 200s under the condition of a voltage of 1.8V, take out the working electrode and fully rinse it with ultrapure water to obtain an anodic oxidation electrode.

[0043] S2: Preparation of Polyth...

Embodiment 2

[0048] Embodiment 2: Comparative experiment of different electrodes

[0049] (1) Preparation of three-dimensional porous carbon modified electrodes

[0050] Use 0.5μm Al on polishing nap pads 2 o 3 The polishing powder is used to polish the glassy carbon electrode with a diameter of 2 mm. After polishing, it is rinsed with ultrapure water, and then ultrasonically cleaned in ethanol and water in sequence. Then, 2.0 μL of the three-dimensional porous carbon dispersion described in Step S3 of Example 1 was drip-coated, and dried under an infrared lamp to obtain a three-dimensional porous carbon-modified electrode.

[0051] (2) With the phosphate buffer containing 100 μmol / L metronidazole as the electrolyte, the phosphate concentration in the phosphate buffer is 0.1mol / L, the pH is 11.0, the bare glassy carbon electrode is the working electrode, and the platinum wire The electrode is the auxiliary electrode, and the saturated calomel electrode is the reference electrode, which ...

Embodiment 3

[0054] Embodiment 3: Detect metronidazole content in medicine

[0055] (1) Dissolve metronidazole in a phosphate buffer solution with a concentration of 0.1mol / L and a pH of 11.0, and prepare a series of concentrations of 0.05, 0.1, 1, 5, 10, 30, 50, 70, 100, 200, 300, 400 and 500 μmol / L metronidazole standard solutions.

[0056] The three-dimensional porous carbon / polythionine composite modified electrode was used as the working electrode, the platinum wire electrode was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. The reduction of metronidazole in the standard solution of metronidazole was determined by differential pulse voltammetry. Differential pulse voltammograms of standard solutions of metronidazole with different concentrations on the three-dimensional porous carbon / polythionine composite modified electrode were obtained. Read the reduction peak current whose voltage is around -0.71V in the differential pul...

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Abstract

The invention belongs to the field of chemical analysis and detection, provides a three-dimensional porous carbon / polythionine compound modified electrode and a production method thereof, and also provides an electrochemical detection method based on the electrode. The three-dimensional porous carbon / polythionine compound modified electrode includes a base electrode, a polythionine coating and a three-dimensional porous carbon coating, the external surface of the base electrode is wrapped with the polythionine coating, and the external surface of the polythionine coating is wrapped with the three-dimensional porous carbon coating to form the three-dimensional porous carbon / polysulfide composite modified electrode. The three-dimensional porous carbon / polythionine compound modified electrodehas good electron transfer ability and can improve the reaction rate of the electrode, the production method has the advantages of simplicity, easiness in implementation, and low cost, and the electrochemical detection method based on the electrode has the advantages of simplicity in operation, good selectivity and high sensitivity.

Description

technical field [0001] The invention belongs to the field of chemical analysis and detection, in particular to a three-dimensional porous carbon / polythionine composite modified electrode and its preparation method and application. Background technique [0002] In the field of chemical analysis and detection, commonly used analytical and detection methods include high performance liquid chromatography, gas chromatography, thin layer chromatography, fluorescence spectrophotometry and electrochemical detection methods. Compared with other methods, the electrochemical detection method has the advantages of fast speed, high sensitivity, low price, and simple operation. However, in the process of electrochemical analysis, most analytes react slowly on bare electrodes, the redox is irreversible, and the peak shape is not good; analytes are easily adsorbed on the electrode surface, resulting in electrode passivation and reduced sensitivity, which is not conducive to analysis and det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 郭慢丽杨玫冯岩龙曹玉娟
Owner SOUTH CHINA NORMAL UNIVERSITY
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