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Nitrogen-doped carbon-supported Fe-Co bimetallic monatomic catalyst for efficiently activating persulfate and preparation method of nitrogen-doped carbon-supported Fe-Co bimetallic monatomic catalyst

A technology for activating persulfate and nitrogen-doped carbon, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., and can solve the problems of high activation energy, low density, and large catalyst dosage, etc. problems, to achieve the effect of overcoming large dosage and high catalytic activity

Active Publication Date: 2021-08-03
NANJING UNIV
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  • 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 monatomic catalyst for efficiently activating persulfate and preparation method of nitrogen-doped carbon-supported Fe-Co bimetallic monatomic catalyst
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  • Nitrogen-doped carbon-supported Fe-Co bimetallic monatomic catalyst for efficiently activating persulfate and preparation method of nitrogen-doped carbon-supported Fe-Co bimetallic monatomic catalyst

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Embodiment 1

[0032] Nitrogen-doped carbon-supported Fe-Co bimetallic single-atom catalyst with high-efficiency activation of persulfate and a preparation method thereof, the specific steps of which are as follows:

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

[0034]b. The UIO-66-NH obtained in step a to adsorb iron and cobalt 2 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 at a rate of 2°C / min for calcination for 3h. After the reaction, the tube furnace was naturally cooled to room temperature to prepare carbonized UIO-66-NH loaded with iron and cobalt 2 .

[0035] c. 1.0 g of the carbonized UIO-66-NH lo...

Embodiment 2

[0040] With embodiment 1, difference is:

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

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

Embodiment 3

[0044] With embodiment 1, difference is:

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

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

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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 bimetallic monatomic catalyst for efficiently activating persulfate and a preparation method of the nitrogen-doped carbon-supported Fe-Co bimetallic monatomic catalyst. A zirconium-based metal organic framework UIO-66-NH2 is used as a carrier, an iron-cobalt precursor is adsorbed by utilizing the coordination effect of amino, metal zirconium nanoparticles are removed through acid pickling after pyrolysis in an inert atmosphere, and the nitrogen-doped carbon-loaded Fe-Co bimetallic monatomic catalyst is prepared. According to the catalyst, monatomic Fe and Co are anchored on a nitrogen-doped carbon matrix through coordination, the catalyst has an ultra-large specific surface area and high-density monatomic catalytic sites, the synergistic effect of bimetallic monatomic Fe and Co can be fully played, and toxic and harmful organic pollutants in water can be rapidly degraded by efficiently activating persulfate. Therefore, the catalyst and the oxidant are greatly saved, and the economic and technical advantages are remarkable.

Description

technical field [0001] The invention relates to the field of new environmental materials, in particular to a nitrogen-doped carbon-supported Fe-Co double-metal single-atom catalyst with high-efficiency activation of 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 transform and degrade through biochemical reactions due to their high biological toxicity. Therefore, the development of economical and efficient new water treatment technologies is of great significance for the control of toxic organic pollutants in water. [0003] The advanced oxidation technology based on persulfate has been widely studied and applied to the treatment of refractory and toxic organic substances in wate...

Claims

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Application Information

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Patent Type & Authority Applications(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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