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Preparation method and application of environment-friendly electro-Fenton negative electrode

A cathode and green technology, applied in the preparation method and application field of the electrode, can solve the problems of low oxygen reduction reaction activity and selectivity of the electric Fenton cathode, less accumulation, high cathode preparation cost, etc., achieving low cost and low energy consumption , The concentration range adapts to the strong effect

Active Publication Date: 2019-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention is to solve the low activity and selectivity of the existing electric Fenton cathode oxygen reduction reaction, resulting in H 2 o 2 Technical problems of low accumulation and high cost of cathode preparation

Method used

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  • Preparation method and application of environment-friendly electro-Fenton negative electrode
  • Preparation method and application of environment-friendly electro-Fenton negative electrode
  • Preparation method and application of environment-friendly electro-Fenton negative electrode

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specific Embodiment approach 1

[0029] Specific embodiment one: the preparation method of the green electric Fenton cathode of the present embodiment, carry out according to the following steps:

[0030] 1. Rinse the waste biomass, crush it through a 200-300 mesh sieve, and dry it to obtain biomass powder;

[0031] 2. Place the biomass powder prepared in step 1 in a quartz boat, then transfer it to a tube furnace, and feed N into the tube furnace. 2 to exclude air, and then in a nitrogen atmosphere at 5 ~ 10 ° C min -1 The heating rate is raised to 200-300°C and kept for 5-6 hours for pre-pyrolysis. After the pre-pyrolysis is completed, cool to room temperature to obtain pre-pyrolysis biomass powder;

[0032] 3. Place the pre-pyrolyzed biomass powder in step 2 in a quartz boat, then transfer it to a tube furnace, and feed N into the tube furnace. 2 to exclude air, and then in a nitrogen atmosphere at 5 ~ 10 ° C min -1 The heating rate is raised to 500-600°C and kept for 2-3 hours for pyrolysis. After the ...

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that the waste biomass described in step 1 is reed; other aspects are the same as Embodiment 1.

specific Embodiment approach 3

[0036] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the drying described in step 1 is to dry at a temperature of 50-80°C for 3-5 hours; Two same.

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Abstract

The invention relates to a preparation method and application of an environment-friendly electro-Fenton negative electrode and relates to an electrode and a preparation method and application thereof.The technical problems are solved that an existing electro-Fenton negative electrode is low in oxygen reduction reaction activity and selectivity, accordingly, the accumulation amount of H2O2 is low,and the cost of preparing the negative electrode is high. The preparation method comprises the steps that waste biomass is completely cleaned, smashed, dried, subjected to pre-pyrolysis in a nitrogenatmosphere at 200-300 DEG C and then subjected to pyrolysis at 500-600 DEG C for obtaining charcoal; then the charcoal, carbon black, a polytetrafluoroethylene dispersion solution and polytetrafluoroethylene are mixed into paste, the paste is pressed on foam nickel, and after heating stabilization, the environment-friendly electro-Fenton negative electrode is obtained. The environment-friendly electro-Fenton negative electrode and a positive electrode are combined into an electrode pair, and the electrode pair is used for conducting electro-Fenton treatment on organic wastewater. In an electro-Fenton reaction, the yield of H2O2 reaches 1,154.42 micromole L-1, and the current efficiency can reach 70.41%. The preparation method can be applied to the field of wastewater treatment.

Description

technical field [0001] The invention relates to a preparation method and application of an electrode, belonging to the field of environmental functional materials. Background technique [0002] As one of the electrochemical technologies, the electro-Fenton technology has the following main principles (Equations 1-1, 1-2 and 1-3): i) Oxygen dissolved in water generates H at the cathode through 2-electron in situ ORR 2 o 2 (Equation 1-1), avoiding the H 2 o 2 Hazards of long-distance transport; ii) in situ generation of H 2 o 2 with an added source of iron (Fe 2+ ) takes place in the classic Fenton reaction (formula 1-2); iii) with Fe 3+ can be reduced to Fe at the cathode 2+ Thereby reducing the dosing of iron source and subsequent iron slime output (Formula 1-3). Current controllability can solve the shortcomings of the conventional Fenton reaction process, such as difficult control, so it has attracted widespread attention from scholars. As a new treatment technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F101/30
CPCC02F1/46109C02F1/4672C02F1/722C02F2001/46138C02F2305/026C02F2001/46133C02F2101/30
Inventor 邱珊邓凤霞李思省李科宏杨基先马放王晓艳邢蕊何淑妍
Owner HARBIN INST OF TECH
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