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A kind of magnesium-iron metal-based carbon nanomaterial and its preparation method and application in nitrogen adsorption

A carbon nanomaterial and metal-based technology, applied in the field of preparation of functional materials, can solve problems such as environmental hazards, difficulty in reusing hydrotalcites, and complicated preparation processes, so as to achieve recycling and overcome the effects of being unable to be reused

Active Publication Date: 2020-11-10
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a new type of metal-organic framework material, MOFs material is formed by self-assembly of inorganic metal centers and organic ligands. It has been reported that it has a certain nitrogen adsorption function, but it can only adsorb 1.8wt.% nitrogen at 298K and 800torr, and The preparation process of such materials is complex (Dipendu Saha, Zongbi Bao, Feng Jia, Shuguang Deng, adsorption of CO 2 ,CH 4 ,N 2 O, and N 2 on MOF-5, MOF-177, and Zeolite 5A. Environmental Science & Technology, 44, 1820–1826, 2010)
[0003] On the other hand, there is a large amount of organic polluted wastewater in the prior art, and a large number of algae outbreaks cause great harm to the environment. At present, it is a good way to use functional adsorption materials to purify organic pollutants and biomass in the environment. , such as the use of large specific surface area and pore structure of hydrotalcites can efficiently treat organic pollutants and algae in the environment, but the hydrotalcites after adsorption treatment are difficult to be reused, which has become a new technical problem

Method used

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  • A kind of magnesium-iron metal-based carbon nanomaterial and its preparation method and application in nitrogen adsorption
  • A kind of magnesium-iron metal-based carbon nanomaterial and its preparation method and application in nitrogen adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Prepare the Mg / Fe salt solution of Mg:Fe=4:1 (molar ratio) and the solution of 2mol / L NaOH respectively, and record them as solutions A and B.

[0037] 2) Stir vigorously at a water bath temperature of 70°C, and slowly add the prepared solutions A and B into a three-neck round-bottomed flask containing 50 mL of ultrapure water through a peristaltic pump, and then inject nitrogen to prevent CO in the air. 2 interference, the solution pH was maintained at 10 ± 0.2.

[0038] 3) After the dropwise addition, the solution was aged in a water bath at 70°C for 18 hours, filtered with suction, washed several times with ultrapure water, dried in an oven at 80°C for 12 hours, and the dried solid was ground to obtain Sample Mg / Fe-LDH.

[0039] 4) Weigh an appropriate amount of Mg / Fe-LDH into a quartz boat, heat it to 450°C in a tube furnace with continuous nitrogen gas, and bake it for 3 hours at a heating rate of 10°C / min, and take it out after cooling down to room temperature...

Embodiment 2

[0043] The preparation of magnesium-iron bimetallic mixed oxide (Mg / Fe-CLDH) is the same as in Example 1.

[0044] Preparation of magnesium-iron metal-based carbon nanomaterials: Weigh 1.5g Orange II and dissolve it in 200ml of water, add 0.5g of MgFe-CLDH for mixing and stirring, after stirring for 12 hours, perform suction filtration, dry, and grind to obtain Mg / Fe - The surface of CLDH loaded Orange II on the composite material. The composite material was calcined at 800℃ for 3h to obtain the magnesium-iron metal-based carbon nanomaterials.

Embodiment 3

[0046] The preparation of magnesium-iron bimetallic mixed oxide (Mg / Fe-CLDH) is the same as in Example 1.

[0047] Preparation of magnesium-iron metal-based carbon nanomaterials: Weigh 1.5g of sodium dodecylbenzenesulfonate (LAS) and dissolve it in 200ml of water, add 0.5g of MgFe-CLDH for mixing and stirring, after stirring for 12 hours, suction filter and dry After grinding, the composite material of sodium dodecylbenzenesulfonate (LAS) supported on the surface of Mg / Fe-CLDH can be obtained. The composite material was calcined at 800℃ for 3h to obtain the magnesium-iron metal-based carbon nanomaterials.

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Abstract

The invention discloses a magnesium iron metal based carbon nanomaterial and a preparation method and application thereof to nitrogen adsorption. The magnesium iron metal based carbon nanomaterial isprepared by steps of adopting magnesium iron hydrotalcite for adsorbing organics or algae and performing calcination. The method takes the advantage of high adsorption performance of magnesium iron hydrotalcite to efficiently treat algae and organic pollutants in the environment, the organic pollutants and the algae are interlaminated in the magnesium iron hydrotalcite, and the organic pollutantsare carbonized by interlayer space effect of the magnesium iron hydrotalcite while ferric iron in the magnesium iron hydrotalcite is reduced into ferrous iron to obtain the magnesium iron metal basedcarbon nanomaterial. The magnesium iron metal based carbon nanomaterial has great nitrogen adsorption performance under high-temperature normal-pressure conditions, and recycling is realized.

Description

technical field [0001] The invention relates to a magnesium-iron metal-based carbon nanomaterial, in particular to a method for preparing a new-type magnesium-iron metal-based carbon nanomaterial using waste materials after absorbing organic pollutants or algae pollutants by magnesium-iron hydrotalcite, and also relates to using it as a The application of a high-performance nitrogen adsorption material belongs to the technical field of functional material preparation. Background technique [0002] As an inert gas, nitrogen is difficult to react with other substances at room temperature. However, nitrogen has high chemical activity, and its electronegativity (3.04) is second only to fluorine, oxygen, chlorine and bromine, indicating that it can form stronger bonds with other elements. At present, metal oxides, carbon materials and mineral materials, as a common adsorption material, have a certain adsorption capacity for nitrogen, but the adsorption generally requires low tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/102B01J20/06B01J20/205
Inventor 许银刘婷娇黄文杰
Owner XIANGTAN UNIV