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Per-oxidized poly(3,4-ethylenedioxythiophene-graphite oxide (PEDOT/GO) modified electrode and electrochemical detection method thereof to pesticide imidacloprid

A technology for modifying electrodes and peroxidation, which is applied in the field of electrochemical analysis and detection, can solve the problems of high price of mercury drop electrodes, environmental pollution, complicated electrode preparation process, unsuitable popularization and application, etc., and achieves simple and fast preparation method and fast and accurate detection method. , the effect of less drug dosage

Active Publication Date: 2013-12-18
昆山市华滤环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Navalón et al. achieved electrochemical rapid detection of imidacloprid using differential pulse polarography ( Microchimica Acta , 1999, 130 : 261), but the mercury dropping electrode used in this method has the disadvantages of high price and easy to cause environmental pollution
Kumaravel et al. prepared a modified electrode based on nano-titanium dioxide, nano-silver, and Nafion composite materials ( Sensors and Actuators B: Chemical , 2011, 158 : 319), realized the electrochemical detection of imidacloprid, but the electrode preparation process of this method is relatively complicated, the cost is also high, and it is not suitable for popularization and application

Method used

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  • Per-oxidized poly(3,4-ethylenedioxythiophene-graphite oxide (PEDOT/GO) modified electrode and electrochemical detection method thereof to pesticide imidacloprid
  • Per-oxidized poly(3,4-ethylenedioxythiophene-graphite oxide (PEDOT/GO) modified electrode and electrochemical detection method thereof to pesticide imidacloprid
  • Per-oxidized poly(3,4-ethylenedioxythiophene-graphite oxide (PEDOT/GO) modified electrode and electrochemical detection method thereof to pesticide imidacloprid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Grind the glassy carbon electrode on 0.1 and 0.03 μm alumina to smooth, rinse with water and acetone, and set aside.

[0026] (2) Dissolve GO in a certain amount of mixed solvent of ethanol and water (volume ratio 1:1) to form 2 mg ml -1 3,4-ethylenedioxythiophene (EDOT) was added to the solution under stirring to a concentration of 0.01M, and after ultrasonication for 60 minutes, a dark brown uniformly dispersed mixed solution was formed. The solution was added to the electrolytic cell device and passed through nitrogen for 20 minutes.

[0027] (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 0.2~1.2V, and the scanning speed is 200mV s -1 , scan 3 circles. The obtained modified electrode was rinse...

Embodiment 2

[0030] (1) Grind the glassy carbon electrode on 0.1 and 0.03 μm alumina to smooth, rinse with water and acetone, and set aside.

[0031] (2) GO was dissolved in a certain amount of mixed solvent of ethanol and water (volume ratio 1:1) to form 0.5 mg ml -1 solution, EDOT was added under stirring to a concentration of 0.002M, and after 30 minutes of ultrasonication, a dark brown uniformly dispersed mixed solution was formed. The solution was added to the electrolytic cell device, and nitrogen gas was passed for 5 minutes.

[0032] (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 -0.2~1.0V, and the scanning speed was 50mV s -1 , scan 20 circles. The obtained modified electrode was rinsed repeatedly with eth...

Embodiment 3

[0035] (1) Grind the glassy carbon electrode on 0.1 and 0.03 μm alumina to smooth, rinse with water and acetone, and set aside.

[0036] (2) GO was dissolved in a certain amount of mixed solvent of ethanol and water (volume ratio 1:1) to form 1 mg ml -1 EDOT solution was added under stirring to a concentration of 0.005M. After ultrasonication for 40 minutes, a dark brown uniformly dispersed mixed solution was formed. The solution was added to the electrolytic cell device, and nitrogen gas was passed for 15 minutes.

[0037] (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 0-1.1V, and the scanning speed was 100mV s -1 , scan 10 circles. The obtained modified electrode was rinsed repeatedly with ethanol an...

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Abstract

The invention discloses a per-oxidized poly(3,4-ethylenedioxythiophene-graphite oxide (PEDOT / GO) modified electrode and an electrochemical detection method of the per-oxidized poly(3,4-ethylenedioxythiophene-graphite oxide (PEDOT / GO) modified electrode to pesticide imidacloprid. The invention relates to one modified electrode capable of being used for electrochemically detecting the pesticide imidacloprid; a per-oxidized PEDOT / GO composite material modified electrode is prepared by a synchronous electrochemical polymerization method and a subsequent per-oxidization process; the current response to the imidacloprid by the obtained electrode is enhanced obviously. The modified electrode has the advantages of high sensitivity, simplicity in operation, convenience in preparation, good stability and repeatability and the like when being used for detecting the pesticide imidacloprid.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a peroxidized PEDOT / GO modified glassy carbon electrode and its application in the detection of the pesticide imidacloprid. Background technique [0002] Graphene is an excellent nanomaterial, and its good electrical conductivity and macroscopic tunneling properties make it an effective electron mediator. At the same time it has a very large specific surface area (up to 2630 m 2 g -1 ) and good mechanical properties, it is widely used in the field of electrochemical sensors, but its lack of active groups limits its application. Graphene oxide (GO) introduces a large number of oxygen-containing groups while maintaining the graphene sheet structure and mechanical properties, making it easier to modify. Poly 3,4-ethylenedioxythiophene (PEDOT) is a conductive polymer with excellent performance. The special structure of the monomer makes ...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30
Inventor 雷武司维蒙郝青丽夏明珠王风云
Owner 昆山市华滤环保科技有限公司
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