Polycarbazole-modified electrode and detection method of explosive hexogen by using same

A technology for modifying electrodes and detection methods, which is applied in the field of electrochemical analysis and detection, can solve the problems of mercury electrode environment pollution, unfavorable popularization and application, etc., and achieve the effects of good repeatability, fast and accurate detection methods, and strong current response

Active Publication Date: 2014-02-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ly et al. used a mercury film electrode to realize the electrochemical detection of RDX by square wave pulse stripping voltammetry (Talanta, 2002, 919-926), but the mercury electrode used is likely to cause environmental pollution. Pollution, not conducive to popularization and application

Method used

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  • Polycarbazole-modified electrode and detection method of explosive hexogen by using same
  • Polycarbazole-modified electrode and detection method of explosive hexogen by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Grind the glassy carbon electrode on 0.1 and 0.03 μm alumina to smooth, rinse with water and acetone, and set aside.

[0021] (2) Add lithium perchlorate to the aqueous solution to make a 0.1M solution, stir and then add excess carbazole monomer, after ultrasonication for 240 minutes, let it stand still and take the supernatant liquid into the electrolytic cell device, and pass nitrogen for 30 minutes.

[0022] (3) In this solution, a three-electrode system was used, the saturated calomel electrode was used as the reference electrode (20°C), the platinum electrode was used as the counter electrode, and the glassy carbon electrode was used as the working electrode. Using cyclic voltammetry, the adjustment potential window is 0.2~1.5V, and the scanning speed is 200mV s -1 , scan 3 circles. The obtained modified electrode was rinsed repeatedly with ethanol and water, and dried with nitrogen to obtain a polycarbazole modified electrode.

[0023] (4) The application of...

Embodiment 2

[0026] (1) Grind the glassy carbon electrode on 0.1 and 0.03 μm alumina to smooth, rinse with water and acetone, and set aside.

[0027] (2) Add lithium perchlorate into the aqueous solution to make a 0.01M solution, stir and then add excess carbazole monomer, after ultrasonication for 60 minutes, let it stand still and take the supernatant liquid into the electrolytic cell device, and pass nitrogen for 15 minutes.

[0028] (3) In this solution, a three-electrode system was used, the saturated calomel electrode was used as the reference electrode (20°C), the platinum electrode was used as the counter electrode, and the glassy carbon electrode was used as the working electrode. Cyclic voltammetry was used, the potential window was adjusted to -0.2~1.3V, and the scanning speed was 50mV s -1 , scan 20 circles. The obtained modified electrode was rinsed repeatedly with ethanol and water, and dried with nitrogen to obtain a polycarbazole modified electrode.

[0029] (4) The appli...

Embodiment 3

[0032] (1) Grind the glassy carbon electrode on 0.1 and 0.03 μm alumina to smooth, rinse with water and acetone, and set aside.

[0033] (2) Add lithium perchlorate to the aqueous solution to make a 0.05M solution, stir and then add excess carbazole monomer, let it stand for 150 minutes after ultrasonication, take the supernatant and add it to the electrolytic cell device, and pass nitrogen for 20 minutes.

[0034] (3) In this solution, a three-electrode system was used, the saturated calomel electrode was used as the reference electrode (20°C), the platinum electrode was used as the counter electrode, and the glassy carbon electrode was used as the working electrode. Using cyclic voltammetry, the adjustment potential window is 0~1.4V, and the scanning speed is 100mV s -1 , scan 15 circles. The obtained modified electrode was rinsed repeatedly with ethanol and water, and dried with nitrogen to obtain a polycarbazole modified electrode.

[0035] (4) The application of polycar...

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Abstract

The invention discloses a polycarbazole-modified electrode and a detection method of explosive hexogen by using the same. The invention relates to the modified electrode for electrochemical detection of the explosive hexogen. The polycarbazole-modified electrode is prepared by electrochemical polymerization in a water solution, and the obtained electrode can significantly enhance the current response against the hexogen. When the polycarbazole-modified electrode disclosed by the invention is used for detecting the explosive hexogen, the polycarbazole-modified electrode has the advantages of high sensitivity, good stability, good repeatability and the like and is simple to operate, and the electrode is easy and convenient to prepare.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a polycarbazole-modified glassy carbon electrode and a detection method for explosive RDX. Background technique [0002] Polycarbazole is an excellent conductive polymer material with good electrical conductivity and mechanical properties, and is widely used in chemical sensors, organic optoelectronic materials and other fields. Therefore, the research on the preparation method of polycarbazole is of great significance to the development of new functional materials with application value. Lei et al. realized the electrochemical detection of the pesticide imidacloprid by preparing a composite material of polycarbazole and graphene ( Sensors and Actuators B: Chemical , 2013, 102-109). However, due to the low solubility of carbazole in aqueous solution, most of the preparation of polycarbazole is carried out in organic solvents, which li...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
Inventor 雷武韩振司维蒙郝青丽夏明珠王风云
Owner NANJING UNIV OF SCI & TECH
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