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Method for producing sulfate radical free radicals to oxidize pollutants through in-situ electrocatalysis

A technology of sulfate radicals and free radicals, applied in the fields of environment, electrochemistry, and energy, to achieve high removal efficiency, efficient in-situ repair treatment, and easy automation.

Active Publication Date: 2020-03-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of the above-mentioned advanced oxidation technology for water pollution control based on sulfate radicals, and to provide a method for in-situ electrocatalysis to generate sulfate radicals to oxidize pollutants, through rational design and construction. An electrochemical system that efficiently generates sulfate radicals in situ, used for in-situ oxidation repair of pollutants, utilizes the sulfate ions that originally existed in the water body to activate and generate strong oxidizing sulfate radicals, and avoids the need for continuous external overheating Problems such as secondary pollution caused by sulfate and rise in salt concentration

Method used

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  • Method for producing sulfate radical free radicals to oxidize pollutants through in-situ electrocatalysis
  • Method for producing sulfate radical free radicals to oxidize pollutants through in-situ electrocatalysis
  • Method for producing sulfate radical free radicals to oxidize pollutants through in-situ electrocatalysis

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Embodiment 1

[0028] An electrochemical system for electrocatalytic in situ generation of strong oxidizing sulfate radicals for the oxidation and removal of pollutants. The principle of the system is as follows figure 1 As shown, its construction includes the following steps:

[0029] (1) The anode material used in the electrochemical system has the following characteristics. A boron-doped diamond electrode with an oxygen evolution potential of 2.4V (vs. SCE) is used as the anode, and Co 3 o 4 As the cathode material, a saturated calomel electrode was used as the reference electrode. The operating conditions of the electrochemical system are: the current density is 10mA / cm 2 , the electrode area is 0.1m 2 / t, the electrode spacing is 1cm, and the supporting electrolyte is 0.1M Na 4 SO 4 aqueous solution.

[0030] (2) Electron paramagnetic resonance technology is used to detect the free radical species produced in this electrochemical system, such as figure 2 As shown, it is found th...

Embodiment 2

[0032] At room temperature, a boron-doped diamond electrode with an oxygen evolution potential of 2.4 V (vs. SCE) was used as the anode, and Co 3 o 4 As the cathode material, a saturated calomel electrode was used as the reference electrode. The operating conditions of the electrochemical system are: the current density is 10mA / cm 2 , the electrode area is 0.1m 2 / t, the electrode spacing is 1cm, and the supporting electrolyte is 0.1mol L -1 Na 4SO 4 Aqueous solution, add 10mg / L of dimethyl phthalate as a pollutant. Such as image 3 As shown, within 30 minutes, the degradation rate of dimethyl phthalate reached 99%, realizing the efficient removal of pollutants.

Embodiment 3

[0034] At room temperature, the boron-doped diamond electrode is used as the anode, the tricobalt tetroxide is used as the cathode, the saturated calomel electrode (SCE) is used as the reference electrode, and the supporting electrolyte solution is: 0.1mol L -1 Sulfate solution in water. The concentration of pollutants was detected by high performance liquid chromatography. This electrochemical system was used to degrade chemical oxygen demand (COD Cr ) is 500mg / L domestic wastewater, and the COD in the degradation process is measured by the national standard method Cr Variety. Such as Figure 4 As shown, COD within 2h Cr The removal rate has reached more than 80%.

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Abstract

The invention relates to a method for producing sulfate radical free radicals to oxidize pollutants through in-situ electrocatalysis. The method comprises the steps: sulfate in wastewater is activatedin situ by an anode material with high oxygen evolution potential to generate persulfate radicals, the generated persulfate radicals are catalyzed into sulfate radical free radicals at a cathode material with electrocatalytic activity, pollutants in the wastewater are oxidized by the sulfate radical free radicals and the sulfate radical free radicals are converted into sulfate at the same time, the sulfate are activated at the anode material again, and the processes are repeated. Compared with the prior art, the method has the advantages that sulfate ions in the water body are used for generating the sulfate radical free radicals in situ to oxidize and remove the pollutants, oxidants (such as peroxymonosulfate and peroxydisulfate) do not need to be added, and the salt concentration of thewater body cannot be increased; the water pollution control technology is high in removal efficiency and small in secondary pollution, and has the characteristic of easiness in automation.

Description

technical field [0001] The invention belongs to the technical fields of energy, environment and electrochemistry, and relates to a method for in-situ electrocatalytically generating strong oxidizing sulfate radicals to oxidize pollutants. Background technique [0002] Water pollution is one of the most important environmental problems. In recent years, emerging pollutants that are difficult to biochemically, such as persistent pollutants and endocrine disruptors, have attracted more and more attention from the public and scientific researchers. At present, the more commonly used method is to use advanced oxidation technology to achieve the degradation of such refractory biochemical pollutants. In the traditional advanced oxidation technology, hydrogen peroxide is used as the main oxidant, and it is activated into hydroxyl radicals with strong oxidation effect through the Fenton-like reaction for pollutant removal, which has been widely used in the practice of sewage treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72
CPCC02F1/4672C02F2305/02
Inventor 赵国华蔡郡倬
Owner TONGJI UNIV
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