Activation method of graphite felt applied to cathode of Electro-Fenton system

An activation method, graphite felt technology, applied in electrochemical water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of reducing material stability and service life, severe oxidation of graphite felt fiber surface, unsuitable for large-scale applications and other problems, to achieve the effect of increasing and improving reaction active sites, excellent oxygen reduction electrocatalytic activity, excellent stability and reuse performance.

Active Publication Date: 2014-11-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the modification treatment methods of graphite felt mainly include: electrochemical oxidation (Electrochimica Acta89 (2013) 429-435), acid treatment (Electrochimica Acta 37 (1992) 2459-2465), noble metal modification (Electrochimica Acta 52 (2007) 6755 -6762), etc., but the effects of these processing methods are not ideal
Acid treatment will easily lead to overoxidation of the electrode material and reduce its stability and life
Electrochemical oxidation method, since sulfuric acid is mostly used as the electrolyte at present, it will also cause severe oxidation on the surface of graphite felt fibers, thereby reducing the stability and service life of the material
Noble metal modification requires multiple high-temperature sintering, the steps are complicated, it is not easy to realize, and the cost of materials is greatly increased, which is not suitable for large-scale applications

Method used

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  • Activation method of graphite felt applied to cathode of Electro-Fenton system
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  • Activation method of graphite felt applied to cathode of Electro-Fenton system

Examples

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Effect test

Embodiment 1

[0046] The preparation method of activated graphite felt of the present invention is as follows:

[0047] The graphite felt was soaked in acetone for 60 minutes at room temperature and ultrasonically cleaned, and then ultrasonically cleaned with deionized water to remove residual organic solvents, and dried to obtain degreasing treated graphite felt. Then soak it in an appropriate amount of 1.5mol / L KOH solution, and ultrasonically treat it for 1 hour to allow the KOH solution to fully soak the graphite felt. Heat at a constant temperature of 85°C to volatilize the solvent and precipitate KOH crystals, which are uniformly coated on the surface of the graphite felt. Put the KOH-coated graphite felt material in a high-temperature furnace, 2 Under the atmosphere protection, the temperature is raised to 900°C at 5°C / min, the temperature is kept constant for 60 minutes, and the temperature is lowered to room temperature at 10°C / min. Then soak in deionized water, and ultrasonically cl...

Embodiment 2

[0049] The preparation method of activated graphite felt of the present invention is as follows:

[0050] The graphite felt was soaked in ethanol for 30 minutes at room temperature and ultrasonically cleaned, and then ultrasonically cleaned with deionized water to remove residual organic solvents, and dried to obtain degreasing treated graphite felt. The obtained graphite felt after degreasing is immersed in an appropriate amount of 3.0 mol / L NaOH solution and ultrasonically treated for 2 hours to allow the NaOH solution to fully soak the graphite felt. Heat at a constant temperature of 85°C to volatilize the solvent and precipitate NaOH crystals, which are uniformly coated on the surface of the graphite felt. NaOH-coated graphite felt material is placed in a high-temperature furnace, 2 Under the protection of the atmosphere, the temperature is increased to 800°C at 5°C / min, the temperature is kept constant for 90 minutes, and the temperature is reduced to room temperature at 20°...

Embodiment 3

[0052] The preparation method of activated graphite felt of the present invention is as follows:

[0053] The graphite felt is immersed in a mixture solution of acetone and ethanol with a volume ratio of 1:1, ultrasonically cleaned at room temperature for 60 minutes, ultrasonically cleaned with deionized water to remove residual organic solvents, and dried to obtain degreasing treated graphite felt. The obtained graphite felt after degreasing is immersed in an appropriate amount of 4.0 mol / L KOH solution and ultrasonically treated for 2 hours to allow the KOH solution to fully soak the graphite felt. Heat at a constant temperature of 85°C to volatilize the solvent and precipitate KOH crystals, which are uniformly coated on the surface of the graphite felt. The obtained KOH-coated graphite felt material is placed in a high-temperature furnace, and under the protection of an inert atmosphere, the temperature is raised to 700° C. at 10° C. / min, and the temperature is kept constant f...

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Abstract

The invention discloses an efficient and feasible activation treatment method for a graphite felt cathode of an Electro-Fenton system. In the method, the graphite felt is uniformly mixed with strong alkaline oxidants of sodium hydroxide, potassium hydroxide and the like, and subjected to high-temperature treatment under the protection of an inert atmosphere, so as to obtain the activated graphite felt. The graphite felt subjected to the activation treatment through the technology of the method disclosed by the invention is used as a cathode material and applied to the Electro-Fenton system, and capable of effectively improving the electrocatalytic activity of H2O2 generation reaction adopting cathodic oxygen reduction, and remarkably improving the degradation capacity of organic pollutants; and moreover, the activated material is excellent in stability and reuse performance. The method disclosed by the invention does not need to use poisonous and volatile reagents, as well as is simple in process, convenient and controllable, and good in application prospect.

Description

Technical field [0001] The invention relates to the technical field of activation treatment of an oxygen reduction electrocatalytic electrode material, in particular to a graphite felt activation method applied to an electro-Fenton system cathode. Background technique [0002] Electric Fenton technology, because it can generate hydrogen peroxide (H 2 O 2 ), and additional Fe 2+ The reaction produces hydroxyl radicals (·OH) with strong oxidizing ability, which can degrade organic pollutants in water quickly and efficiently without selectivity, which has attracted widespread attention. [0003] How to realize the efficient in-situ generation of H by the electric Fenton cathode 2 O 2 , Is a key issue in the research field of this technology, the cathode material is H 2 O 2 The decisive factor for efficient in-situ generation. Because carbon materials have good stability, conductivity, non-toxicity, high hydrogen evolution potential, and for H 2 O 2 Its decomposition catalytic activity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72
CPCY02E60/50
Inventor 王毅刘裕辉宋树芹刘鸿
Owner SUN YAT SEN UNIV
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