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A kind of preparation method and application of green electric Fenton cathode

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, high cost of cathode preparation, and less accumulation, and achieve low cost and concentration range Strong adaptability and low energy consumption

Active Publication Date: 2022-03-15
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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  • A kind of preparation method and application of green electric Fenton cathode
  • A kind of preparation method and application of green electric Fenton cathode
  • A kind of preparation method and application of green electric Fenton cathode

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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

A preparation method and application of a green electric Fenton cathode, the present invention relates to an electrode and its preparation method and application, it is to solve the existing electric Fenton cathode oxygen reduction reaction activity and low selectivity, resulting in H 2 o 2 The technical problems of low accumulation and high cost of cathode preparation. Preparation method: After cleaning, crushing and drying the waste biomass, pre-pyrolyze it in a nitrogen atmosphere at 200-300°C, and then pyrolyze it at 500-600°C to obtain biochar; then combine biochar with carbon black, The polytetrafluoroethylene dispersion liquid and ethanol are mixed to form a paste, and then the paste is pressed on the nickel foam, and after being heated and stabilized, a green electric Fenton cathode is obtained. It forms an electrode pair with the anode, and performs electro-Fenton treatment on organic wastewater. In the electro-Fenton reaction, H 2 o 2 Yield up to 1154.42 μmol L ‑1 , the current efficiency can reach 70.41%. It can be used in 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 Patents(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