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Nitrogen-doped carbon-supported fe-co bimetallic single-atom catalyst for efficient activation of persulfate and preparation method thereof

A technology for activating persulfate and nitrogen-doped carbon, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. problem, to overcome the effect of large dosage and high catalytic activity

Active Publication Date: 2022-08-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the current advanced oxidation technology based on persulfate, such as the disadvantages of large catalyst dosage, difficulty in recycling, and easy to cause secondary pollution in homogeneous catalysts, traditional heterogeneous catalysts are also faced with low active site density, Due to the problems of low catalytic efficiency caused by high reaction activation energy, the present invention provides a nitrogen-doped carbon-supported Fe-Co bimetallic single-atom catalyst that can efficiently activate persulfate with the advantages of both homogeneous and heterogeneous catalysts. Compared with the single metal atom catalyst, it can exert the synergistic effect between the double metal atoms to further improve the catalytic efficiency

Method used

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  • Nitrogen-doped carbon-supported fe-co bimetallic single-atom catalyst for efficient activation of persulfate and preparation method thereof
  • Nitrogen-doped carbon-supported fe-co bimetallic single-atom catalyst for efficient activation of persulfate and preparation method thereof
  • Nitrogen-doped carbon-supported fe-co bimetallic single-atom catalyst for efficient activation of persulfate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A nitrogen-doped carbon-supported Fe-Co bimetal single-atom catalyst for efficiently activating persulfate and a preparation method thereof, the specific steps are:

[0033] a. 1.0g UIO-66-NH 2 , 249mg FeCl 2 ·4H 2 O, 298mg CoCl 2 ·6H 2 O was dissolved in 200 mL of N,N-dimethylformamide, the solution was stirred and reacted at room temperature for 12 h, the precipitated product was collected by centrifugation, washed with water and dried in vacuum to obtain UIO-66-NH that adsorbed iron and cobalt 2 .

[0034]b. UIO-66-NH of the adsorbed iron and cobalt obtained in step a. 2 It was placed in a crucible, covered with a lid, and transferred to a tube furnace. Under the protection of an argon inert atmosphere, the temperature was raised to 700 °C for 3 h at a rate of 2 °C / min. After the reaction, the tube furnace was naturally cooled to room temperature to obtain the carbonized iron-cobalt-loaded UIO-66-NH. 2 .

[0035] c. 1.0 g of the carbonized iron-cobalt-support...

Embodiment 2

[0040] With the embodiment 1, the difference is:

[0041] The iron ion compound in step a was changed to FeCl 3 ·6H 2 O, its mass is 339 mg, and the cobalt ion compound is changed to Co(NO 3 ) 2 ·6H 2 O, its mass was 364 mg, and the volume of N,N-dimethylformamide was 112 mL.

[0042] Under the same experimental conditions as in Example 1, the degradation rate of the obtained catalyst to sulfamethoxazole within 6 minutes was 94.3%.

Embodiment 3

[0044] With the embodiment 1, the difference is:

[0045] The iron ion compound in step a was changed to Fe(NO 3 ) 2 ·6H 2 O, its mass is 668 mg, the cobalt ion compound is changed to CoSO 4 ·7H 2 O, whose mass is 652 mg.

[0046] Under the same experimental conditions as Example 1, the degradation rate of the obtained catalyst to sulfamethoxazole within 6 minutes was 95.8%.

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Abstract

The invention relates to the field of new environmental materials, in particular to a nitrogen-doped carbon-supported Fe-Co bimetal single-atom catalyst for efficiently activating persulfate and a preparation method thereof; the invention uses a zirconium-based metal organic framework UIO-66-NH 2 As a carrier, the iron and cobalt precursors are adsorbed by the coordination of amino groups, and the metal zirconium nanoparticles are removed by acid washing after pyrolysis in an inert atmosphere to prepare a nitrogen-doped carbon-supported Fe-Co bimetallic single-atom catalyst; the catalyst passes through The coordination anchors single-atom Fe and Co on the nitrogen-doped carbon matrix, which has a large specific surface area and a high density of single-atom catalytic sites. High-efficiency activation of persulfate quickly degrades water poisoning organic pollutants, thereby greatly saving the amount of catalyst and oxidant, and has significant economic and technological advantages.

Description

technical field [0001] The invention relates to the field of new environmental materials, in particular to a nitrogen-doped carbon-supported Fe-Co bimetal single-atom catalyst for efficiently activating persulfate and a preparation method thereof. Background technique [0002] With the widespread use of a large number of chemical products in people's production and life, many refractory and toxic organic substances enter the water environment, posing a serious threat to water ecological security and human health. Such pollutants are difficult to be converted and degraded by biochemical reactions due to their high biological toxicity. Therefore, the development of economical and efficient new water treatment technologies is of great significance for controlling water poisoning organic pollutants. [0003] Advanced oxidation technology based on persulfate has been widely studied and applied to the treatment of refractory toxic organics in water. Compared with traditional Fento...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/72C02F101/30C02F101/38C02F101/34
CPCB01J27/24C02F1/722C02F1/725C02F2101/30C02F2101/40C02F2101/345
Inventor 刘福强范钟伟朱长青聂宇李爱民
Owner NANJING UNIV
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