Two-dimensional carbon nitride supported iron monatomic catalyst as well as preparation method and application thereof

A carbon nitride and catalyst technology, applied in the field of two-dimensional carbon nitride iron-supported single-atom catalyst and its preparation, can solve the problems of quenching of active oxygen species, low catalytic efficiency, high processing cost, etc., and achieve efficient degradation, increase Number, maintaining the effect of efficient degradation

Pending Publication Date: 2022-03-15
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a two-dimensional carbon nitride iron-supported single-atom catalyst and its preparation method and application. The catalyst can mediate direct electron transfer between pollutants and persulfate, effectively avoiding the inhibition of inorganic salts, Maintain high catalytic efficiency under high-salt stress; its preparation method is simple and its application effect is good; it can effectively solve the problems of active oxygen species quenching, low catalytic efficiency and high treatment cost in the current treatment of high-salt organic wastewater

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  • Two-dimensional carbon nitride supported iron monatomic catalyst as well as preparation method and application thereof
  • Two-dimensional carbon nitride supported iron monatomic catalyst as well as preparation method and application thereof
  • Two-dimensional carbon nitride supported iron monatomic catalyst as well as preparation method and application thereof

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Embodiment 1

[0026] The technical solution adopted in this embodiment is a method for preparing a two-dimensional carbon nitride-supported iron single-atom catalyst, and its specific steps are:

[0027] a. Dissolve 6.306g of melamine and 6.454g of cyanuric acid in 375mL of water respectively, then mix the two evenly, stir the mixed solution at 80°C for 4h, centrifuge (8000r / min) for 6min to collect the precipitated product, and The supramolecular assembly was obtained after vacuum drying at 60°C for 24 h.

[0028] b. Weigh 2 g of the supramolecular assembly obtained in step a, place it in a ball mill jar with 211.9 mg of iron acetylacetonate, and ball mill (1500 r / min) for 15 minutes to obtain the iron-containing supramolecular.

[0029] c. Place the iron-containing supramolecules obtained in step b in a crucible, cover and transfer to a tube furnace, and under the protection of an argon inert atmosphere, heat up to 600°C at a rate of 5°C / min for calcination for 2h. After the reaction is ...

Embodiment 2

[0031] This example relates to a two-dimensional carbon nitride-supported iron single-atom catalyst, which is prepared by the preparation method in Example 1. The transmission electron microscope image of the two-dimensional carbon nitride-supported iron single-atom catalyst is shown in figure 1 As shown in A, the element distribution diagram is as follows figure 1 Shown in B, C, D, E, F. From figure 1 It can be seen that a large amount of monatomic iron is uniformly distributed on the surface of the catalyst.

Embodiment 3

[0033] The technical solution provided in this example is the application of a two-dimensional carbon nitride iron-supported single-atom catalyst in the degradation of organic pollution in high-salt wastewater: the efficient activation of persulfate obtained in Example 1 to remove refractory organic matter in high-salt wastewater The two-dimensional carbon nitride supported iron single-atom catalyst was used to activate potassium persulfate compound salt to test its degradation performance of sulfamethoxazole.

[0034] The specific experimental conditions are as follows: 8 mg of two-dimensional carbon nitride iron-supported single-atom catalyst is placed in 100 mL of sulfamethoxazole solution, wherein the concentration of sulfamethoxazole is 20 mg / L, and the experimental temperature is 25° C. The two-dimensional carbon nitride iron-supported single-atom catalyst was ultrasonically dispersed for 5 minutes and then adsorbed sulfamethoxazole. After 10 minutes, the adsorption-desor...

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Abstract

The invention relates to a preparation method of a two-dimensional carbon nitride-loaded iron monatomic catalyst, which comprises the following steps: respectively heating and dissolving melamine and cyanuric acid in water, mixing to assemble the melamine and cyanuric acid, centrifuging and drying the obtained precipitate to obtain a supramolecular assembly; mixing the supramolecular assembly with an iron-containing precursor, and inserting the iron-containing precursor into the interlayer of the supramolecular assembly through ball milling to obtain an iron-containing supramolecule; and calcining the iron-containing supramolecules under the protection of inert gas to obtain the two-dimensional carbon nitride supported iron monatomic catalyst. The invention also relates to a two-dimensional carbon nitride supported iron monatomic catalyst and application of the catalyst. According to the technical scheme, direct electron transfer between pollutants and persulfate can be mediated, inhibition of inorganic salt is effectively avoided, and high catalytic efficiency under high salt stress is maintained; the preparation method is simple, and the application effect is good; the method can effectively solve the problems of reactive oxygen species quenching, low catalytic efficiency, high treatment cost and the like in the existing method for treating high-salt organic wastewater.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a two-dimensional carbon nitride iron-supported single-atom catalyst capable of efficiently activating persulfate to remove refractory organic matter in high-salt wastewater, and a preparation method and application thereof. Background technique [0002] The rapid development of petrochemical, pharmaceutical, electroplating and other industries has produced and discharged a large amount of high-salt organic wastewater. This type of wastewater has high salinity, high COD, high toxicity, and poor biodegradability. At present, the main treatment technologies for high-salt organic wastewater include membrane treatment technology, heat treatment technology and coupling technology. In membrane treatment technology, how to obtain a membrane material that simultaneously satisfies high flux, high rejection rate, low membrane fouling, high mechanical strength, and low cost is a di...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/745B01J37/08C02F1/72C02F101/34C02F101/38
CPCB01J27/24B01J23/745B01J37/086C02F1/725C02F2101/34C02F2101/38C02F2101/40B01J35/399
Inventor 刘福强聂宇朱长青寸芬贤李爱民
Owner NANJING UNIV
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