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Sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst as well as preparation method and use method thereof

A technology of oxides and nanosheets, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of complex operation, low removal rate, high catalyst cost, etc., achieve efficient degradation and improve catalytic performance The effect of activity and simple preparation method

Active Publication Date: 2022-01-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a sulfur-modified iron-cobalt oxide nanosheet-like Fenton catalyst and its preparation method and use method in order to overcome the deficiencies in the prior art, in order to solve the low removal rate of rhodamine B and high catalyst cost , operating complex issues

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  • Sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst as well as preparation method and use method thereof
  • Sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst as well as preparation method and use method thereof
  • Sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst as well as preparation method and use method thereof

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preparation example Construction

[0031] The invention provides a method for preparing a sulfur-modified iron-cobalt oxide nanosheet Fenton catalyst, comprising the following steps:

[0032] 1) After mixing cobalt nitrate hexahydrate solution, ferrous sulfate heptahydrate solution, ammonium fluoride and urea, hydrothermal reaction is carried out to obtain solid precipitation;

[0033] 2) vacuum-drying and calcining the solid precipitate in sequence to obtain a precursor;

[0034] 3) Calcining the precursor and sublimed sulfur under an inert atmosphere to obtain a sulfur-modified iron-cobalt oxide nanosheet-like Fenton catalyst.

[0035] Step 1) of the present invention, the volume ratio of the cobalt nitrate hexahydrate solution and the ferrous sulfate heptahydrate solution is preferably 1~2:1~2, more preferably 1:1; the concentration of the cobalt nitrate hexahydrate solution is preferably 0.03~ 0.04mol / L, more preferably 0.032~0.037mol / L, more preferably 0.033~0.034mol / L; the concentration of ferrous sulfat...

Embodiment 1

[0062] Cobalt nitrate hexahydrate solution and ferrous sulfate heptahydrate solution were prepared in 15 mL deionized water respectively, the concentrations of cobalt nitrate solution hexahydrate solution and ferrous sulfate heptahydrate solution were 0.034mol / L and 0.017mol / L respectively. Mix cobalt nitrate hexahydrate solution and ferrous sulfate heptahydrate solution, then add ammonium fluoride and urea, the molar ratio of ferrous sulfate heptahydrate, ammonium fluoride and urea is 1:10:15, stir and mix for 1 hour to obtain a uniform solution .

[0063] The homogeneous solution was transferred to a 50mL polytetrafluoroethylene-lined reactor, the temperature was raised to 120°C at a rate of 4°C / min, and the hydrothermal reaction was carried out at 120°C for 9 hours and then cooled naturally. The obtained precipitate was washed alternately with deionized water and 98% ethanol for a total of 4 times, and collected by centrifugation to obtain a solid precipitate. Dry the soli...

Embodiment 2

[0072] Cobalt nitrate hexahydrate solution and ferrous sulfate heptahydrate solution were prepared in 15mL deionized water respectively, the concentrations of cobalt nitrate solution hexahydrate solution and ferrous sulfate heptahydrate solution were 0.032mol / L and 0.017mol / L respectively. Mix cobalt nitrate hexahydrate solution and ferrous sulfate heptahydrate solution, then add ammonium fluoride and urea, the molar ratio of ferrous sulfate heptahydrate, ammonium fluoride and urea is 1:9.6:14.6, stir and mix for 1 hour to obtain a uniform solution .

[0073] The homogeneous solution was transferred to a 50 mL polytetrafluoroethylene-lined reaction kettle, and the temperature was raised to 110 °C at a rate of 3 °C / min, and the hydrothermal reaction was carried out at 110 °C for 10 h, and then cooled naturally. The obtained precipitate was alternately washed with deionized water and 97% ethanol for a total of 5 times, and collected by centrifugation to obtain a solid precipitat...

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Abstract

The invention belongs to the technical field of catalysts, and provides a sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst and a preparation method thereof. The preparation method comprises the steps of mixing a cobalt nitrate hexahydrate solution, a ferrous sulfate heptahydrate solution, ammonium fluoride and urea, and then conducting a hydrothermal reaction to obtain solid precipitate; sequentially carrying out vacuum drying and calcining treatment on the solid precipitate to obtain a precursor; and calcining the precursor and sublimed sulfur in an inert atmosphere to obtain the sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst. The invention also provides a method for degrading rhodamine B by using the sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst. The sulfur-modified iron-cobalt oxide nanosheet Fenton-like catalyst disclosed by the invention has layered multi-stage flower-like morphology, can efficiently degrade organic pollutants in water, especially organic dyes, and has the removal rate of rhodamine B up to 100%.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a sulfur-modified iron-cobalt oxide nanosheet Fenton catalyst and a preparation method and use method thereof. Background technique [0002] With the continuous development of modern industrialization and urbanization, dyes are widely used in various manufacturing industries such as leather, printing, papermaking, and textiles. The disorderly discharge of dyes leads to the aggravation of water pollution, which may cause great harm to the ecosystem and human health. Rhodamine B is a bright pink synthetic dye that has been detected in many industrial effluents, rivers and even oceans. [0003] The most common removal technologies for dye pollutants in water mainly include adsorption, biological and advanced oxidation methods. Among them, the adsorption method can only enrich and transfer the pollutants, but does not achieve the complete removal of the pollutants, which is easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C02F1/72C02F101/38
CPCB01J27/043C02F1/725C02F2101/38B01J35/613Y02W10/37
Inventor 孔令涛时旭刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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