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Heterogeneous electro-Fenton water treatment method adopting boron-nitrogen co-doped carbon nanotube coated iron cathode

A technology of carbon nanotubes and co-doping, applied in the field of environment and materials, can solve the problems of low catalytic performance, achieve efficient removal and easy operation

Active Publication Date: 2021-06-04
NANKAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the current non-metallic doping has the problem of low catalytic performance.

Method used

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  • Heterogeneous electro-Fenton water treatment method adopting boron-nitrogen co-doped carbon nanotube coated iron cathode
  • Heterogeneous electro-Fenton water treatment method adopting boron-nitrogen co-doped carbon nanotube coated iron cathode
  • Heterogeneous electro-Fenton water treatment method adopting boron-nitrogen co-doped carbon nanotube coated iron cathode

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Experimental program
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Embodiment Construction

[0018] Mix boric acid, melamine and ferric nitrate in water at a molar ratio of 60:30:(1 to 4), stir for 4 hours, and then evaporate to dryness; calcinate it at 800°C for 3 hours under an argon atmosphere; then the above The obtained powder was weighed in 400 microliters of ethanol, and added to Nafion solution, ultrasonically mixed evenly, coated on carbon cloth and dried naturally;

[0019] The components of the catalyst were characterized by X-ray photoelectron spectroscopy, and the results are shown in figure 1 , the catalyst mainly includes C, O, B, N and Fe elements. During the rotating disk electrode test, it was found that the prepared Fe@BN-C catalyst showed a good electron transfer process, and the calculated H 2 o 2 The selection rate can reach more than 90%, see the results figure 2 , indicating that Fe@BN-C is a good catalyst for two-electron ORR process.

[0020] The catalytic performance of the Fe@BN-C cathode prepared in this example is tested as follows: ...

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Abstract

The invention relates to a boron-nitrogen co-doped carbon nanotube coated iron cathode. The cathode is applied to a heterogeneous electro-Fenton water treatment method to realize efficient removal of pollutants. In a heterogeneous electro-Fenton water treatment method, the H2O2 selectivity of the cathode catalyst can reach 90%-95%, and extremely low dissolution (<0.2 mg L <-1 >) can be realized, and at the same time, the generation of singlet oxygen is improved by the method. Therefore, the cathode can simultaneously realize generation of H2O2, shows excellent catalytic performance in pollutant degradation in a pH range of 3-9, and can be repeatedly used for more than 10 times. The water treatment method is suitable for efficiently removing various pollutants in a neutral state, and solves the problems that the conventional homogeneous Fenton reaction is narrow in pH application range and cannot be repeatedly used.

Description

technical field [0001] The invention relates to the fields of materials and environment, in particular, the invention relates to the preparation of a boron-nitrogen co-doped carbon nanotube-wrapped iron catalyst and its application as a cathode in heterogeneous electric Fenton water treatment. Background technique [0002] The homogeneous electro-Fenton technique can generate non-selective hydroxyl radicals ( · OH) has attracted much attention. However, its optimum pH range is 2.8 to 3.5, and ferrous iron cannot be recycled, which will generate a large amount of iron sludge and increase the cost of secondary treatment. Due to the environmental friendliness and cost-effectiveness of iron as a catalyst, iron-based carbon materials are a promising heterogeneous catalyst. The heterogeneous catalyst is used as an electric Fenton cathode, where oxygen is reduced to electrons to generate H 2 o 2 , while the active sites in the iron-based catalyst convert H 2 o 2 Decomposition...

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Application Information

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IPC IPC(8): C02F1/461C02F1/72
CPCC02F1/46109C02F1/4672C02F2001/46142C02F2305/026
Inventor 周明华苏沛
Owner NANKAI UNIV