Preparation method of stable type carbon paste electrode

A carbon paste electrode, stable technology, applied in the field of electrochemical analysis, can solve the problems of long response time, unstable physical and chemical properties of the test electrode surface, etc., to achieve the effect of reducing the adsorption rate, reducing the surface energy of the material, and improving the response effect

Active Publication Date: 2017-11-21
宁夏蓝伯碳素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention: for the existing carbon paste electrode, the electrode needs to be updated every time, which leads to insufficient stability of the physical and chemical properties of the test electrode surface. Secondly, the existing electrode material has the defect of long response time during testing. A kind of preparation method of stable carbon paste electrode

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  • Preparation method of stable type carbon paste electrode

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Effect test

example 1

[0019] According to the mass ratio of 1:6, the paraffin oil and graphite particles were mixed and placed in a ball milling tank, and ball milled at 250r / min for 3 hours. After the ball milling was completed, the carbon paste was passed through a 200-mesh sieve. Fill it into a polytetrafluoroethylene material electrode tube with an inner diameter of 2mm, repeatedly compact the carbon paste with a copper rod, insert a copper wire at the other end of the electrode tube and fix it, extrude the carbon paste on the surface and polish it to obtain carbon Paste electrode, according to the mass ratio of 1:8, soak the carbon paste electrode in 8% sodium hydroxide solution, then use cyclic voltammetry to scan 45 circles in the 0.8V potential window, take out the carbon paste electrode and dry it in vacuum , to obtain an activated electrode; according to the mass ratio of 1:5, add fluorite ore powder to 1mol / L sodium silicate solution, stir and mix, and heat in an oil bath at 120 ° C. Afte...

example 2

[0021] According to the mass ratio of 1:6, the paraffin oil and graphite particles were stirred and mixed and placed in a ball milling tank, and ball milled at 275r / min for 4h. After the ball milling was completed, the carbon paste was passed through a 200 mesh sieve, and the carbon paste was Fill it into a polytetrafluoroethylene material electrode tube with an inner diameter of 3mm, repeatedly compact the carbon paste with a copper rod, insert a copper wire at the other end of the electrode tube and fix it, extrude the carbon paste on the surface and polish it to obtain carbon Paste electrode, according to the mass ratio of 1:8, soak the carbon paste electrode in 8% sodium hydroxide solution, and then use cyclic voltammetry to scan 47 circles in the 0.9V potential window, take out the carbon paste electrode and dry it in vacuum , to obtain an activated electrode; according to the mass ratio of 1:5, add fluorite ore powder to 1mol / L sodium silicate solution, stir and mix, and ...

example 3

[0023] According to the mass ratio of 1:6, the paraffin oil and graphite particles were mixed and placed in a ball milling tank, and ball milled at 300r / min for 5 hours. After the ball milling was completed, the carbon paste was passed through a 200-mesh sieve. Fill it into a polytetrafluoroethylene material electrode tube with an inner diameter of 3mm, repeatedly compact the carbon paste with a copper rod, insert a copper wire at the other end of the electrode tube and fix it, extrude the carbon paste on the surface and polish it to obtain carbon Paste electrode, according to the mass ratio of 1:8, soak the carbon paste electrode in 8% sodium hydroxide solution, then use cyclic voltammetry to scan 50 circles in the 1.0V potential window, take out the carbon paste electrode and dry it in vacuum , to obtain an activated electrode; according to the mass ratio of 1:5, add fluorite ore powder to 1mol / L sodium silicate solution, stir and mix, and heat in an oil bath at 130°C. After ...

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Abstract

The invention relates to a preparation method of a stable type carbon paste electrode, belonging to the technical field of electrochemical analysis. The method comprises the following steps: by using fluorite ore powder and a sodium silicate solution as raw materials, preparing crystallized modifying liquid and placing a carbon paste electrode in the modifying liquid, performing high-temperature crystallization, loading nanometer cryolite particles on the surface of a carbon paste electrode material, meanwhile, modifying the surface of the carbon paste electrode to form stable fluoroaluminate ions, and reducing the surface energy of the material, thus reducing the adsorption rate of a tested object on the surface of the material after finishing tests of the material, and improving the stability of the surface physicochemical properties of the carbon paste electrode. By crystallizing the nanometer cryolite particles on the surface of the electrode and adding nano particles on the surface of the electrode, the area of the electrode is effectively increased, meanwhile, as nanometer cryolite has electropositivity, electronegative probe ions are more helped to reach an electrode interface to react, the response effect of the carbon paste electrode to signals is effectively improved, and the carbon paste electrode has excellent sensitivity.

Description

technical field [0001] The invention relates to a preparation method of a stable carbon paste electrode, belonging to the technical field of electrochemical analysis. Background technique [0002] In electroanalytical research, carbon paste electrodes are playing an increasingly important role in the field of electroanalytical chemistry due to their special properties such as small background current, easy surface renewal, wide potential and wide opening, and long service life. effect. The so-called carbon paste electrode is a kind of paste made by firstly mixing conductive graphite powder and hydrophobic binder in a certain proportion, and then filling it into the electrode tube or coating it on the surface of the electrode rod. Class electrodes. The materials used to prepare carbon paste electrodes, the surface state of electrodes, etc. will affect the performance of electrodes. Therefore, the preparation of carbon paste electrodes is a basic and important work. [000...

Claims

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Application Information

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IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 朱浩明季美
Owner 宁夏蓝伯碳素有限公司
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