Electro-Fenton cathode material based on lignin and preparation method thereof

A cathode material and lignin technology, which is applied in the field of lignin-based electric Fenton cathode materials and its preparation, can solve the problems of low hydrogen peroxide output and low degradation and mineralization rate of organic pollutants, and achieve low preparation cost, Effects of eliminating limitations of space-time yield and low space velocity, reducing use of toxic reagents

Active Publication Date: 2017-02-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0003] The object of the present invention is to provide a lignin-based electro-Fenton cathode material and its preparation method for the low yield of hydrogen peroxide and the low rate of degradation and mineralization of organic pollutants in the existing electro-Fenton reaction

Method used

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  • Electro-Fenton cathode material based on lignin and preparation method thereof
  • Electro-Fenton cathode material based on lignin and preparation method thereof
  • Electro-Fenton cathode material based on lignin and preparation method thereof

Examples

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Embodiment 1

[0041] Such as figure 1 Shown is a schematic diagram of the fabrication process of the electro-Fenton system cathode. The pyrrole / lignin copolymerized cathode material (PPy / LGS-CF) was prepared as follows:

[0042] (1) Carbon-based material pretreatment: immerse the carbon-based material in 10wt% H 2 o 2, heated in a water bath at 90°C for 3 hours, and then rinsed with deionized water for 3 times; then heated with deionized water in a water bath at 90°C for 2 hours, during which the deionized water was replaced every 1 hour and the steps of rinsing were repeated; Take out the base and dry it at 60°C for 24 hours for later use;

[0043] (2) Using an electrochemical workstation, a three-electrode system is used, with a pretreated carbon-based material anode as the working electrode, a platinum electrode as the counter electrode, and a saturated calomel electrode as the reference electrode. The substance monomer and lignin are dissolved in 0.1M HClO at a mass concentration ra...

Embodiment 2

[0049] The difference between this embodiment and Example 1 is that the cathode is an unmodified pretreated carbon felt substrate electrode; other conditions are the same as in Example 1.

[0050] The present embodiment finds that the unmodified carbon felt substrate electrode does not find obvious oxygen reduction peak in a certain potential range (see Figure 5 ).

Embodiment 3

[0052] The difference between this embodiment and Example 1 is that the different unit charges in the cathodic constant current electrodeposition polymerization process are within 0.5C.cm -2 , 1.0 C.cm -2 、1.5 C.cm -2 、2.0 C.cm -2 、2.5C.cm -2 , the time is 100s, 200s, 300s, 400s, 500s; the concentration of the conductive polymer monomer in the mixed solution is 0.075mol / L, and the lignin concentration is 5mg / mL; other conditions are the same as in Example 1.

[0053] The experiment found that with the increase of charge, the oxygen reduction peak becomes more obvious, and 2.0C.cm -2 PPy / LGS-CF has the best electrochemical activity (see Figure 6 ).

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Abstract

The invention discloses an electro-Fenton cathode material based on lignin and a preparation method thereof. The preparation method includes the following steps that (1) a carbon-based material is preprocessed; (2) electrochemical polymerization deposition is carried out; and (3) an obtained conducting polymer monomer/lignin copolymerization cathode material is cleaned with deionized water and naturally dried at room temperature, and the electro-Fenton cathode material is obtained. Compared with a traditional chemical modification method, the prepared electro-Fenton cathode material is advantageous in that use of toxic reagents and complex treatment are reduced, electrode modification is achieved at one step, preparation cost is low, and electrode manufacturing industrialization is easily achieved; and modified electrodes are used for electro-Fenton systems, so that electron transfer and the oxygen reduction process of dual electrons are facilitated, the yield of hydrogen peroxide is remarkably increased, and the discoloration, degradation and mineralization degree of pollutants is further increased.

Description

technical field [0001] The invention relates to the field of electric Fenton cathode materials, in particular to a lignin-based electric Fenton cathode material and a preparation method thereof. Background technique [0002] The research on the Electro-Fenton method (Electro-Fenton) began in the 1980s. It is an electrochemical advanced oxidation technology based on the Fenton chemical reaction developed in water treatment technology in recent years. Electro-Fenton technology is different from ordinary Fenton technology by directly adding Fe 2+ and H 2 o 2 , Fe in the electro-Fenton technique 2+ or H 2 o 2 It is directly produced in situ by electrolytic reaction, and the Fe produced by the reaction 2+ and H 2 o 2 A catalytic reaction occurs immediately to generate hydroxyl radicals (.OH) to degrade organic pollutants. At present, graphite, reticulated glass carbon, mercury, activated carbon felt and activated carbon fiber used in engineering are widely used as cathod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/00C02F1/46
CPCC02F1/46C25B3/00
Inventor 冯春华黄海澜王冠雯王凯韦朝海
Owner SOUTH CHINA UNIV OF TECH
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