Preparation method of green heteroatom modified integrated biochar cathode

A technology of biochar and heteroatoms, applied in the preparation/purification of carbon, etc., which can solve the problems of inability to coordinate regulation and low accumulation of electro-Fenton cathodes

Active Publication Date: 2021-05-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the H 2 o 2 The technical problem of low accumulation

Method used

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  • Preparation method of green heteroatom modified integrated biochar cathode
  • Preparation method of green heteroatom modified integrated biochar cathode
  • Preparation method of green heteroatom modified integrated biochar cathode

Examples

Experimental program
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Embodiment 1

[0034] Embodiment 1: The preparation method of the green heteroatom modified integrated biochar cathode of this embodiment is carried out according to the following steps:

[0035] 1. Cut the discarded wood blocks into a regular shape of 1×2cm, and at the same time use abrasive paper to polish the surface and corners of the wood blocks, and the obtained wood blocks will be polished to obtain regular and smooth original samples;

[0036]2. Place the original sample obtained in step 1 in a clean and dry beaker. The mass ratio of the phosphoric acid solution with a mass percent concentration of 30% to the original sample is 30:1, and the original sample is completely immersed in the mass percent concentration The immersion treatment is carried out in a 30% phosphoric acid solution, and the immersion treatment time is 5 hours. After the immersion treatment, the original sample is rinsed with deionized water to ensure that the phosphoric acid floating on the surface of the original ...

Embodiment 2

[0050] Example 2: The difference between this example and Example 1 is that in Step 4, carbonization is carried out at a temperature of 500° C. for 2 hours, and the others are the same as Example 1.

Embodiment 3

[0051] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 4, carbonization is carried out at a temperature of 850° C. for 2 hours, and the others are the same as Embodiment 1.

[0052] The green heteroatom modified integrated biochar cathode prepared in Examples 1, 2 and 3 and the reference carbon cathode in Example 1 and a boron-doped diamond electrode (BDD) are used to form a pair of electrochemical plates, which are placed in a 120mL Concentration of 50mM Na 2 SO 4 Solution is electrolyte, pH is 3, air flow rate is 300mL min -1 In the electrochemical system, the cathode produces H 2 o 2 Determination of accumulation. The experimental conditions are as follows: the system current is 50mA, the current density is 25mA cm -2 . H obtained 2 o 2 The accumulation test results are as follows: Figure 7 shown, from Figure 7 It can be seen that the green heteroatom-modified integrated biochar cathode has a high current density of 25mA cm ...

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Abstract

The invention discloses a preparation method of a green heteroatom modified integrated biochar cathode, and relates to a preparation method of a biochar cathode. The invention aims to solve the technical problem of low H2O2 accumulation amount caused by the fact that an existing electro-Fenton cathode cannot cooperatively regulate and control oxygen mass transfer and electron transfer. The method comprises the following steps: 1, polishing the surface of a wood biomass material; 2, dipping the material in a phosphoric acid solution; 3, conducting freeze drying; and 4, conducting pre-carbonization and carbonization to obtain the green heteroatom modified integrated biochar cathode. According to the green heteroatom modified integrated biochar cathode, the H2O2 yield reaches 5-6.5 mg*L<-1> when the current density is 25 mA*cm<-2>, and the green heteroatom modified integrated biochar cathode can be applied to the field of electro-Fenton.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and mainly relates to a method for preparing a biochar cathode. Background technique [0002] Electrochemical technology has the advantages of controllable process, easy operation, and no risk of secondary pollution. As one of the electrochemical technologies, electro-Fenton technology has the following main principles: [0003] o 2 +2e - +2H + →H 2 o 2 (E 0 =0.695V / SHE) (1-1) [0004] h 2 o 2 +Fe 2+ → Fe 3+ + - OH+ OH (1-2) [0005] Fe 3+ +e - → Fe 2+ (E 0 =0.77V / SHE) (1-3) [0006] i) Oxygen dissolved in water generates H at the cathode through 2-electron in situ ORR reaction 2 o 2 ; ii) generated H 2 o 2 with Fe 2+ The catalyst undergoes a classic Fenton reaction; iii) while Fe 3+ can be reduced to Fe at the cathode 2+ Thereby reducing the addition of catalyst and the accumulation of iron sludge in the reaction process. Electro-Fenton, as a new treat...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 邓凤霞邱珊曹玉林荆宝剑
Owner HARBIN INST OF TECH
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