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Preparation method of electro-Fenton cathode material based on sludge-based biomass charcoal as well as product and application of electro-Fenton cathode material

A technology of biomass carbon and cathode materials, applied in chemical instruments and methods, water/sewage treatment equipment, water/sludge/sewage treatment, etc., can solve the problems of reducing oxygen reduction potential, reducing electrocatalytic efficiency, poor stability, etc. , to achieve the effect of overcoming crystal transformation, controllable shape, and overcoming poor stability

Active Publication Date: 2021-06-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in order to improve the cathode H 2 o 2 The accumulation amount proposed to use biochar to chemically dope the matrix carbon material, and found that the performance of the carbon material modified by reasonable biochar was significantly improved, the hydrophobicity of the material was greatly improved, and the oxygen reduction potential was reduced. Material surface H 2 o 2 However, it is found that the electro-Fenton cathode material modified by biochar has the problems of poor stability and high cost, and its electrocatalytic efficiency also decreases when it is applied in the field of water pollutant degradation.

Method used

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  • Preparation method of electro-Fenton cathode material based on sludge-based biomass charcoal as well as product and application of electro-Fenton cathode material
  • Preparation method of electro-Fenton cathode material based on sludge-based biomass charcoal as well as product and application of electro-Fenton cathode material
  • Preparation method of electro-Fenton cathode material based on sludge-based biomass charcoal as well as product and application of electro-Fenton cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) After washing the retrieved municipal sludge to remove impurities, centrifugal dehydration, drying at 105°C for 15 hours, crushing through a 200-mesh sieve to obtain biomass powder;

[0044] (2) Dissolve 3g of urea and 3g of biomass powder (mixed according to the ratio of 1:1) in 50mL of deionized water, place in a 100mL reactor, control the temperature at 160°C for 10h for hydrothermal reaction, and cool down after completion to room temperature to obtain a nitrogen-doped biomass solution, and then keep it at 90°C for 24 hours for drying and dehydration to obtain a pre-pyrolyzed nitrogen-doped biomass powder;

[0045] (3) Place the pre-pyrolyzed nitrogen-doped biomass powder in a quartz boat, then transfer it to a tube furnace, and feed N into the tube furnace. 2 Exhaust the air, then heat up to 800°C at a heating rate of 5°C / min in a nitrogen atmosphere and keep it for 1h for pyrolysis. After the pyrolysis is completed, cool to room temperature to obtain nitrogen-...

Embodiment 2

[0055] Same as Example 1, the difference is that 3g of urea is mixed with 6g of biomass powder (mixed according to the ratio of 0.5:1).

Embodiment 3

[0057] Same as Example 1, the difference is that 3g of urea is mixed with 1.5g of biomass powder (mixed according to the ratio of 1:0.5).

[0058] The electric Fenton cathode material prepared by test example 1-3 and the control group (only biomass) were electrolyzed for 1h to produce H 2 o 2 amount and the degradation rate of sulfamethoxazole in sewage, the results are shown in Table 1.

[0059] Table 1

[0060]

[0061] It can be seen that the ratio of urea to biomass has a significant effect on H production 2 o 2 Both the amount and the degradation rate of sulfamethoxazole have a certain impact. The reason may be that the amount of nitrogen doped on the biochar is insufficient, the ORR active sites on the surface of the nitrogen-doped sludge-based biochar are few, and the electrocatalytic efficiency is not high. , resulting in H 2 o 2 The output and the degradation rate of sulfamethoxazole are not high; the doping amount of nitrogen element is too large, which will...

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Abstract

The invention provides a preparation method of an electro-Fenton cathode material based on sludge-based biomass charcoal as well as a product and application of the electro-Fenton cathode material. The method comprises the steps: treating municipal sludge to obtain biomass powder, mixing the biomass powder with urea according to a fixed ratio, adding the mixture into deionized water, and carrying out hydrothermal reaction to obtain pre-pyrolyzed nitrogen-doped biomass powder; then carrying out pyrolysis under the condition of 750 to 850 DEG C to obtain nitrogen-doped sludge-based biomass charcoal; and uniformly mixing the sludge-based biomass charcoal with a polytetrafluoroethylene dispersion liquid and ethanol, pressing the obtained substance on foamed nickel, and heating and stabilizing to obtain the electro-Fenton cathode material based on the sludge-based biomass charcoal. The electro-Fenton cathode material can be used in an electro-Fenton system to degrade organic wastewater, the yield of H2O2 reaches up to 104.02 mg / L in the reaction process, and the electro-Fenton cathode material can be used in the field of sewage treatment.

Description

technical field [0001] The invention relates to the field of electro-Fenton cathode materials, in particular to a method for preparing an electro-Fenton cathode material based on sludge-based biomass charcoal, as well as its products and applications. Background technique [0002] Electro-Fenton technology is a new type of advanced oxidation technology, the basic principle of which is that oxygen undergoes an in-situ two-electron oxygen reduction reaction (ORR) (Formula 1) on the surface of the cathode material to generate hydrogen peroxide (H 2 o 2 ), the generated H 2 o 2 Further with Fe in solution 2 + The reaction generates hydroxyl radicals (·OH) with strong oxidative properties, and finally achieves the degradation and removal of refractory organic pollutants through the strong oxidative properties of ·OH. [0003] o 2 +2e - +2H + →H 2 o 2 (E 0 =0.695V / SHE) (1) [0004] h 2 o 2 The output is an important factor affecting the degradation and removal of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467C02F1/72
CPCC02F1/46109C02F1/4672C02F1/722C02F1/725C02F2001/46142C02F2201/46105
Inventor 魏佳邢璐伊
Owner BEIJING UNIV OF TECH
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