Electrochemical detection method for pesticide imidacloprid based on polypyrrole/reduced graphene oxide (PPy/RGO) modified glassy carbon electrode

A glassy carbon electrode and detection method technology, applied in the field of electrochemical analysis and detection, can solve the problems of complex preparation of modified glassy carbon electrodes, and achieve the effects of fast electron transfer rate, low detection limit, and large electroactive area

Active Publication Date: 2013-12-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of polycarbazole/chemically reduced graphene oxide-modified glassy carbon electrode is complic

Method used

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  • Electrochemical detection method for pesticide imidacloprid based on polypyrrole/reduced graphene oxide (PPy/RGO) modified glassy carbon electrode
  • Electrochemical detection method for pesticide imidacloprid based on polypyrrole/reduced graphene oxide (PPy/RGO) modified glassy carbon electrode
  • Electrochemical detection method for pesticide imidacloprid based on polypyrrole/reduced graphene oxide (PPy/RGO) modified glassy carbon electrode

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Experimental program
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Embodiment 1

[0024] The electrochemical detection method of imidacloprid by PPy / RGO modified glassy carbon electrode is characterized in that, comprising the following steps:

[0025] (1) Preparation of polypyrrole / reduced graphene oxide modified glassy carbon electrode (PPy / RGO): Add 10 μL of pure pyrrole monomer dropwise to 10 ml of graphene oxide dispersion with a concentration of 1 mg / mL, and then sonicate for half an hour , to obtain a mixed solution containing pyrrole monomer and graphene oxide. The clean and prepared glassy carbon electrode was placed in the mixed solution, and the potential range was -0.2 ~ 1.0 V. Cyclic voltammetry polymerization was performed for 10 cycles, and the scan rate was 100 mV / s to obtain a polypyrrole / graphene oxide modified glassy carbon electrode. The obtained polypyrrole / graphene oxide modified glassy carbon electrode was placed in a phosphate buffer solution with pH = 7, and the potential range was 0 ~ -1.7 V. Cyclic voltammetry was scanned for 10 c...

Embodiment 2

[0035] The electrochemical detection method of imidacloprid by PPy / RGO modified glassy carbon electrode is characterized in that, comprising the following steps:

[0036] (1) Preparation of polypyrrole / reduced graphene oxide modified glassy carbon electrode (PPy / RGO): Add 15 μL of pure pyrrole monomer dropwise to 10 ml of graphene oxide dispersion with a concentration of 5 mg / mL, and then ultrasonically hours, a mixed solution containing pyrrole monomer and graphene oxide was obtained. The clean prepared glassy carbon electrode was placed in the mixed solution, the potential range was -0.2 - 1.0 V, cyclic voltammetry polymerization was performed for 5 cycles, and the scan rate was 100 mV / s, and the polypyrrole / graphene oxide modified glassy carbon electrode was obtained. The obtained polypyrrole / graphene oxide modified glassy carbon electrode was placed in a phosphate buffer solution with pH = 7, and the potential range was 0 ~ -1.7 V. Cyclic voltammetry was scanned for 5 cycl...

Embodiment 3

[0040] The electrochemical detection method of imidacloprid by PPy / RGO modified glassy carbon electrode is characterized in that, comprising the following steps:

[0041] (1) Preparation of polypyrrole / reduced graphene oxide modified glassy carbon electrode (PPy / RGO): Add 20 μL of pure pyrrole monomer dropwise to 10 ml of graphene oxide dispersion with a concentration of 0.5 mg / mL, and then sonicate After half an hour, a mixed solution containing pyrrole monomer and graphene oxide was obtained. The clean prepared glassy carbon electrode was placed in the mixed solution, the potential range was -0.2 ~ 1.0 V, cyclic voltammetry polymerization was performed for 30 cycles, and the scan rate was 100 mV / s, and the polypyrrole / graphene oxide modified glassy carbon electrode was obtained. The obtained polypyrrole / graphene oxide modified glassy carbon electrode was placed in a phosphate buffer solution with pH = 7, and the potential range was 0 ~ -1.7 V. Cyclic voltammetry was scanned ...

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Abstract

The invention discloses an electrochemical detection method for a pesticide imidacloprid based on a polypyrrole/reduced graphene oxide (PPy/RGO) modified glassy carbon electrode. The method comprises the following steps: firstly, carrying out electrochemical reduction to prepare the polypyrrole/reduced graphene oxide (PPy/RGO) modified glassy carbon electrode; and secondly, utilizing the prepared PPy/RGO modified glassy carbon electrode to the electrochemical detection of the pesticide imidacloprid. The PPy/RGO modified glassy carbon electrode provided by the invention has high sensitivity, good stability, wide linear range and low detection limit on the detection of the imidacloprid.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and relates to an electrochemical detection method for the pesticide imidacloprid based on a PPy / RGO modified electrode. Background technique [0002] Polypyrrole is an important conductive polymer that has been widely studied, and has the characteristics of simple fabrication, high conductivity, good biocompatibility, and low cost. Using pyrrole as a monomer, it can usually be made into a conductive film by electrochemical oxidation polymerization, and can also be synthesized by electrochemical anodic oxidation of pyrrole. The presence of an amine group (-NH-) on the pyrrole ring may lead to enhanced detection of biomolecules. At the same time, polypyrrole can also be used for ion detection, modified electrodes for photoelectrochemical cells, electrode materials for batteries, electrocatalytic materials, conductive polymer composite materials, etc. [0003] Graph...

Claims

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Application Information

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