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Method for degrading organic pollutants by using self oxygen supply and self acidification electro-Fenton system

A technology of organic pollutants and self-supplying oxygen, which is applied in the direction of water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of electric Fenton system difficult to work, difficult air, lack of oxygen, etc., to save The effect of acidification

Inactive Publication Date: 2017-09-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some environments (such as groundwater), there is a lack of oxygen itself, and it is difficult to introduce air or pure oxygen at the same time, which makes it difficult for the traditional electric Fenton system to work

Method used

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  • Method for degrading organic pollutants by using self oxygen supply and self acidification electro-Fenton system
  • Method for degrading organic pollutants by using self oxygen supply and self acidification electro-Fenton system
  • Method for degrading organic pollutants by using self oxygen supply and self acidification electro-Fenton system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] at 50mmolL -1 Na 2 SO 4 , 5mg L -1 Rhodamine B and 0.5mmol L -1 FeSO 4 In the neutral solution, use the power supply to supply power to the self-oxygenation and self-acidifying electro-Fenton system. The reduction cathode 2 adopts the hydrogen evolution cathode, the hydrogen evolution cathode adopts the constant current mode, and the constant current is -5mA, and the oxygen reduction cathode 1 adopts the constant voltage mode. , the constant voltage is -0.4V (relative to the Ag / AgCl reference electrode, after conversion, -0.21V relative to the potential of the standard hydrogen electrode), and the oxygen evolution anode is used as a common counter electrode. Take 1mL of samples every 20min, then inject 1mL of electrolyte solution containing Rhodamine B, repeat 7 times, and measure the solubility of Rhodamine B by spectrophotometry, as shown in figure 2 shown.

Embodiment 2

[0031] at 50mmolL -1 Na 2 SO 4 In the neutral solution, use the power supply to supply power to the self-oxygenation and self-acidifying electro-Fenton system. The reduction cathode 2 adopts the hydrogen evolution cathode, the hydrogen evolution cathode adopts the constant current mode, and the constant current is -5mA, and the oxygen reduction cathode 1 adopts the constant voltage mode. , the constant voltage is -0.4V (relative to the Ag / AgCl reference electrode, after conversion, -0.21V relative to the potential of the standard hydrogen electrode), and the oxygen evolution anode is used as a common counter electrode. Put the pH meter probe in the solution between the oxygen evolution anode and the oxygen reduction cathode 1, read the pH value every 20 minutes, and repeat 7 times. After 120min ends, pour the solution into a beaker and mix well, then measure the pH value again, as image 3 shown.

[0032] The results of Comprehensive Example 1 and Comparative Example 1 can...

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Abstract

The invention provides a method for degrading organic pollutants by using a self oxygen supply and self acidification electro-Fenton system. The electro-Fenton system used by the method comprises two cathodes and a common anode, and concretely comprises an oxygen reduction cathode, a reduction cathode and an oxygen evolution anode. In the system, oxygen produced by the common anode freely diffuses to the oxygen reduction cathode, hydrogen peroxide is generated on the surface of a catalysis layer of the oxygen reduction cathode through in situ reduction, the generated hydrogen peroxide diffuses into an aqueous phase and is excited to generate .OH, and the high-oxidizability .OH oxidizes and degrades the organic pollutants; and hydrogen ions (H<+>) generated by the common anode freely diffuse into the aqueous phase to spontaneously form an acidic environment. Compared with conventional electro-Fenton methods, the method disclosed in the invention has the advantages of no extra supply of oxygen to the oxygen reduction cathode, generation of the local acidic environment, and no need of acidification pretreatment of sewage.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for degrading organic pollutants by using an electric Fenton system of self-oxygenation and self-acidification. Background technique [0002] The Fenton system is made of hydrogen peroxide (H 2 o 2 ) and activator, it can generate strong oxidative hydroxyl radicals (OH), which will oxidize and react with organic matter in aqueous solution to destroy its structure, and finally oxidize and decompose. Fenton oxidation can effectively treat wastewater containing nitrobenzene, ABS, etc., and can be used for decolorization and deodorization of wastewater. Therefore, as an efficient and environmentally friendly oxidation system, the Fenton system is widely used in the field of environmental pollution control. Since the optimal pH range of the Fenton reaction is 2.8 to 3.0, it is necessary to add acid to reduce the pH value of the wastewater when using the...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F1/461C02F101/30
CPCC02F1/46104C02F1/4672C02F2101/308
Inventor 张芳张海川李广贺张旭侯德义
Owner TSINGHUA UNIV
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