Method and device for electrolytic oxidation reduction for self-cleaning composite graphite electrode

A composite graphite, electrolytic oxidation technology, applied in the field of electrochemical electrolysis, can solve the problems of rising current or voltage, affecting electrolysis efficiency, increasing power consumption, etc., to eliminate concentration polarization, avoid power consumption, and improve utilization efficiency. Effect

Inactive Publication Date: 2013-01-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electro-redox conversion usually uses a lower current density, such as less than 100A / m 2 , there are often polymers attached to the electrode surface, which affects the electrolysis efficiency
In addition, as the electrolysis proceeds, the materials near the electrolysis will continue to be consumed, and the current or voltage will continue to rise, resulting in concentration polarization and increased power consumption.
In the industry, forced turbulence or enhanced stirring are often used to eliminate, but it also consumes energy

Method used

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  • Method and device for electrolytic oxidation reduction for self-cleaning composite graphite electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] As shown in the attached figure, the self-cleaning composite graphite electrode electrolysis adopts a periodic steering electrolysis device. The electrolytic device includes: an electrolytic tank, a periodic steering controller, and a DC power supply system. The positive and negative electrodes of the electrolytic tank are insoluble metal stainless steel with a thickness of 3mm. It is a flat plate structure, with graphite repolarization in the middle, the outer diameter of the particles is about 1.5mm, and they are piled up in bulk. The distance between the insoluble metal electrode plates in the electrolytic cell is 10mm, and the distance between the graphite repolarization and the insoluble metal electrode plates in the middle is 1mm. Use plastic wire mesh to isolate, so that graphite repolarization and stainless steel electrodes cannot be in contact. The cycle steering controller realizes the cyclic operation of energization-disconnection-steering energization-disconn...

Embodiment 2

[0045] The difference from Example 1 is that the thickness of the stainless steel is 2 mm, the outer diameter of the graphite particles is about 3.5 mm, the distance between the electrode plates is 50 mm, and the distance between the graphite repolarization pole and the insoluble metal electrode plate in the middle is 2 mm.

[0046] Electrolysis method steps: 1) Use 15% sodium hydroxide solution to adjust the pH value to 7, and use sodium sulfate to adjust the conductivity to 0.7S / m; 2) The steering cycle is 80 seconds, and the ratio of disconnection time to power-on time is 1: 4; 3) Current density 10A / m 2 .

[0047]After 10 hours of electrolysis, the electrode was taken out, rinsed and dried with deionized water, and observed with an electron microscope at 5000 times. It can be seen that one side of the electrode is the same as the new electrode, and the other side has polymer adsorption. The positive and negative poles of the electrode are switched every 80 seconds, and on...

Embodiment 3

[0049] The difference from Example 1 is that the thickness of the stainless steel is 1.5 mm, the outer diameter of the graphite particles is about 5 mm, the distance between the electrode plates is 100 mm, and the distance between the graphite repolarization electrode and the insoluble metal electrode plate is 3 mm.

[0050] Electrolysis method steps: 1) Use 15% sodium hydroxide solution to adjust the pH value to 7, and use sodium sulfate to adjust the conductivity to 0.3S / m; 2) The steering cycle is 120 seconds, and the ratio of disconnection time to power-on time is 1: 2; 3) Current density 15A / m 2 .

[0051] After 4 hours of electrolysis, take out the material and replace it with a new one. After repeating 5 times, take out the electrode, rinse and dry it with deionized water, and observe it with an electron microscope at 5000 times. It can be seen that one side of the electrode is the same as the new electrode, and there is polymer on the other side. adsorption. The posi...

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Abstract

The invention relates to a method and a device for electrolytic oxidation reduction for a self-cleaning composite graphite electrode and belongs to the technical field of electrochemical electrolysis. The device is a periodic turning electrolyzer comprising an electrolysis bath, a periodic turning controller and a direct current supply system, wherein the positive electrode and the negative electrode are made of insoluble metal; a graphite complex pole is arranged in the middle; and the periodic turning controller realizes the circulating operations of power turn-on, power turn-off, turning power turn-on and power turn-off. The electrolysis method comprises the following steps: (1) materials are fed into the electrolysis bath, wherein the electric conductivity for the electrolyzed materials is larger than 0.1 S/m, and the pH value is adjusted to be 6 to 12; (2) the periodic turning controller is adjusted; and (3) power is turned on to carry out electrolytic oxidation reduction reaction, wherein the electric current density is 5 to 80 A/m<2>. The method and the device can realize self-cleaning of the electrode in the electrolytic oxidation reduction process, improve the electrolysis efficiency and reduce the electrolysis energy consumption and are easy for industrial implementation.

Description

technical field [0001] The invention relates to the technical field of electrochemical electrolysis, in particular to a self-cleaning composite graphite electrode electrolytic redox method and device. technical background [0002] The basic principle of electrochemical electrolysis water treatment technology is to generate hydroxyl radicals (OH), ozone (0 3 ), hydrogen peroxide (H 2 0 2 ), hypochlorite (ClO - ), Chlorine (Cl 2 ) or atomic oxygen and other strong oxidants, and then degrade the pollutants in the wastewater. Electrochemical electrolysis technology is an advanced oxidation technology. As an "environmentally friendly technology", electrochemical electrolysis treatment has been widely studied and applied in the treatment of some refractory biodegradable pollutants. As a cleaning treatment process, electrochemical electrolysis is highly flexible and can be applied alone or in combination with other treatment methods. [0003] Electrochemical electrolysis is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72
CPCY02W10/37
Inventor 吴玉凯谢嫚张存中陈甫雪李汉军穆道斌王国青王雪梅赵之平丁春淡于晓艳侯庆伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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