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Preparation method and application method of electro-Fenton composite membrane cathode

A composite membrane and cathode technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of low performance of hydrogen peroxide, achieve mild treatment process, easy control of parameters, and increase yield

Active Publication Date: 2021-05-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the in situ hydrogen peroxide production performance of the reported electric Fenton membrane cathode is at a low level, and the hydrogen peroxide yield is only 0.02-0.07mg h -1 cm -2 Between, much lower than the traditional electric Fenton carbon felt cathode (4.50-7.70mg h -1 cm -2 ) and air diffusion cathode (10.30-12.16mg h -1 cm -2 )

Method used

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  • Preparation method and application method of electro-Fenton composite membrane cathode
  • Preparation method and application method of electro-Fenton composite membrane cathode
  • Preparation method and application method of electro-Fenton composite membrane cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Electrospun Fe 3 o 4 -The preparation method of carbon felt electric Fenton composite membrane cathode is as follows:

[0041] Step 1: Add 0.12g of nano-Fe 3 o 4 Particles were added to dimethylformamide (DMF) for ultrasonic vibration, according to Fe 3 o 4 Particle dispersion, adjust the addition of surfactant sodium dodecyl sulfate (SDS), so that Fe 3 o 4 The particles are uniformly dispersed in DMF solution.

[0042] Step 2: In the uniformly dispersed solution, add 3g of PVDF powder to prepare a spinning solution containing 10-18% PVDF mass fraction, stir and dissolve the mixed solution in a water bath at 60°C, and continue stirring for 12 hours to form homogeneous solution.

[0043] Step 3: First pretreat the circular carbon felt with a diameter of 30mm and a thickness of 3mm, soak it in acetone for 2 hours, then wash it with a large amount of deionized water and dry it. Graphene and carbon black are mixed according to the mass ratio of 1:5, after adding 2m...

Embodiment 2

[0050] In this example, carbon sponge was used as a carrier, and the carbon sponge was modified with carbon black to prepare electrospun Fe 3 o 4 - carbon sponge electric Fenton membrane cathode, the preparation method is the same as embodiment 1.

Embodiment 3

[0059] In this example, electrospun Fe 3 o 4 -Carbon felt electro-Fenton composite membrane cathode is used in the treatment of micro-pollutants to construct a filter-type electro-Fenton system, electrospun Fe 3 o 4 - The carbon felt electric Fenton composite membrane cathode is placed in the middle of the reactor, and the mesh DSA electrodes are respectively placed in the upper and lower parts of the reactor. The carbon felt interface in the composite membrane cathode is opposite to the lower DSA anode, and the Fe in the composite membrane cathode 3 o 4 The interface is opposite to the anode of the upper DSA, and the cathode and anode are separated by an insulating net. Under the action of the peristaltic pump, the pollutants penetrate through the cathode and anode in turn, which is a filtration type.

[0060] In the parallel system, the flow direction of pollutants is changed from passing through the anode and cathode in sequence to flowing through the reactor parallel t...

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Abstract

The invention relates to a preparation method and an application method of an electro-Fenton composite membrane cathode, and the method comprises the following steps: uniformly dispersing nano-particles of a heterogeneous iron-containing catalyst in an electrostatic spinning solution, and collecting electrostatic fibers on a conductive carbon material carrier capable of producing hydrogen peroxide by adopting an electrostatic spinning technology, enabling the nano-particles to form an electrospinning catalytic membrane along with the electrostatic fiber generation process and loading the nano-particles on the carrier. According to the preparation method, the yield of hydrogen peroxide can be remarkably improved, especially in the electrostatic fiber generation process, a carbon felt which is modified by graphene and carbon black and has good conductivity is adopted as a fiber receiving device, hydrogen peroxide is efficiently generated in situ on the interface of the modified carbon felt, and .OH is generated in situ on the nano-particle catalysis interface. The yield of hydrogen peroxide is greatly improved, and the micro-pollutants enriched on the surface of the membrane cathode are efficiently catalyzed, so that the efficient removal of the micro-pollutants is realized.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a preparation method and an application method of a novel electro-Fenton composite membrane cathode. Background technique [0002] Due to the in-situ generation of strong oxidizing hydroxyl radicals (·OH)(E 0 =2.80V vs. SHE), has become a research hotspot in the field of advanced treatment of refractory organic pollutants. However, when the pollutants are at low concentration levels, the reaction rate between electrolytic·OH and pollutants is much lower than that at high concentration levels. This is because the lifetime of electrolytic OH is very short (10 -9 s), mainly concentrated on the surface of the electrode and nearby areas. At a low concentration level of pollutants, the chance of contact and collision between OH and pollutants is reduced, and the utilization efficiency of OH decreases accordingly, which is not conducive to the removal of micro-pollutants. Ho...

Claims

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Application Information

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IPC IPC(8): H01M4/88C02F1/46C02F1/461
CPCH01M4/8853H01M4/8825C02F1/46C02F1/461Y02E60/50
Inventor 任更波范守港赵明晨饶天彤马小东
Owner HEBEI UNIV OF TECH
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