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Method for preparing and regenerating iron complex type carbon film gas diffusion electrode applied to electric Fenton system

A gas diffusion electrode and complexation technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. Low efficiency and other problems, to achieve the effect of good electroreduction regeneration performance, easy popularization and application, and simple preparation method

Active Publication Date: 2019-05-28
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation and regeneration method of iron-complexed carbon film gas diffusion electrode, this electrode is used as the negative electrode of electric Fenton system, active component iron is fixed on the electrode with the mode of ionic state complexation, Simultaneously press O 2 The direction of flow is done sequentially on the electrodes H 2 o 2 In-situ generation and Fenton reaction can solve the problems of poor diffusion and mass transfer, H 2 o 2 Low yield, Fe 2+ Problems such as easy complexation and inactivation and difficulty in reduction and regeneration

Method used

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  • Method for preparing and regenerating iron complex type carbon film gas diffusion electrode applied to electric Fenton system
  • Method for preparing and regenerating iron complex type carbon film gas diffusion electrode applied to electric Fenton system
  • Method for preparing and regenerating iron complex type carbon film gas diffusion electrode applied to electric Fenton system

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Effect test

Embodiment 1

[0041] 1. Preparation method of gas diffusion electrode:

[0042] The chemical substance material used in the present invention is:

[0043] Nitrogen-doped graphitized carbon nanotubes: NCNT, purity>95%, outer diameter 10-30nm, length 5-15μm, nitrogen content 3.46wt%;

[0044] Graphene oxide dispersion: GO, the concentration is 4mg / mL;

[0045] Sodium hydroxide: NaOH, analytically pure;

[0046] Ferrous Sulfate Heptahydrate: FeSO 4 ·7H 2 O, analytically pure;

[0047] Polytetrafluoroethylene emulsion; PTFE, the concentration is 60wt%;

[0048] Absolute ethanol: C 2 h 6 O, analytically pure;

[0049] Acetone: CH 3 COCH 3 , analytically pure;

[0050] Deionized water: H2 O, resistivity ≥ 18MΩ;

[0051] Oxygen: O 2 , purity ≥ 99.999%;

[0052] Nitrogen: N 2 , purity ≥ 99.999%;

[0053] Anhydrous sodium sulfate: Na 2 SO 4 , analytically pure;

[0054] 4-Nitrophenol: C 6 h 5 NO 3 , analytically pure.

[0055] (1) Preparation of iron-complexed graphene oxide p...

Embodiment 2

[0089] The preparation steps and dosage of iron-complexed graphene oxide powder and iron-complexed carbon film gas diffusion electrode are the same as in Example 1.

[0090] use figure 2 The bubbling electric Fenton reactor shown treats methylene blue simulated wastewater. The specific test conditions are as follows: the anode is a graphite electrode (50 × 40mm), and the cathode is an iron-complexed carbon film gas diffusion electrode (50mm in diameter); the reaction solution is a mixed solution of 400mL of 0.1mol / L sodium sulfate and 10mg / L methylene blue, The pH value is not adjusted; the gas used in the reaction is compressed air, and the flow rate of the gas is 100mL / min; at 5mA / cm 2 The solution can be completely decolorized when the current density is reacted for 90 minutes, and the TOC removal rate of the solution can reach 60.3% when reacted for 300 minutes, which can effectively treat organic wastewater.

[0091] Regeneration of iron-complexed carbon film gas diffu...

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Abstract

The invention relates to a method for preparing and regenerating an iron complex type carbon film gas diffusion electrode applied to an electric Fenton system. The iron complex type carbon film gas diffusion electrode is prepared from the following components: nitrogen-doped graphitized carbon nanotubes, graphene oxide dispersion, sodium hydroxide, ferrous sulfate, polytetrafluoroethylene emulsion, absolute ethyl alcohol, acetone, deionized water, oxygen and nitrogen. The preparation method comprises the steps that (1) iron complexed graphene oxide powder is prepared; and (2) the iron complextype carbon film gas diffusion electrode is prepared. The electrode regeneration method comprises the steps that a gas diffusion electrode is installed in a reactor, nitrogen is introduced, an electrolyte solution is placed, electroreduction regeneration is performed at a constant cathode potential, and the regenerated electrode is washed with the deionized water and dried. The gas diffusion electrode acts as a cathode in the reactor, and completes O2 catalytic reduction and the .OH formation reaction successively in the air flow direction; and meanwhile, the gas diffusion electrode plays therole of gas distribution, thereby promoting the mass transfer in a liquid phase region. The performance of the electrode after regeneration is substantially unchanged from that of a new electrode.

Description

technical field [0001] The invention relates to the technical field of preparation and application of electro-Fenton system cathode materials, in particular to a preparation and regeneration method of an iron-complexed carbon film gas diffusion electrode. Background technique [0002] Water resource pollution has become a global problem. Especially in recent years, the types of organic pollutants in water bodies have increased year by year, and their components are complex, highly toxic, and difficult to biodegrade. With the increasingly stringent environmental protection standards, some conventional treatment technologies are difficult to achieve satisfactory results in the treatment of refractory organic matter. Therefore, it is an urgent problem to seek efficient, economical and environmentally friendly advanced treatment technology to control the discharge of refractory organic pollutants or restore the polluted water environment. [0003] Fenton oxidation technology is...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72
Inventor 汤茜高永慧石淑云杨春维孙玉伟郜航李冰伦周昊
Owner JILIN NORMAL UNIV
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