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Magnesium iron metal based carbon nanomaterial and preparation method and application thereof to nitrogen adsorption

A carbon nanomaterial, metal-based technology, applied in the field of functional material preparation, can solve the problems of environmental hazards, difficult reuse of hydrotalcite-like, complex preparation process, etc., and achieve the effect of realizing recycling and overcoming the inability to reuse.

Active Publication Date: 2018-08-17
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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  • Magnesium iron metal based carbon nanomaterial and preparation method and application thereof to nitrogen adsorption
  • Magnesium iron metal based carbon nanomaterial and preparation method and application thereof to nitrogen adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0037] 2) Stir vigorously under the condition of a water bath temperature of 70℃, and slowly drop the prepared solutions A and B into a three-necked round bottom flask containing 50mL ultrapure water through a peristaltic pump, and then pour in nitrogen to prevent CO in the air 2 The pH of the solution is maintained at 10±0.2.

[0038] 3) The solution after dripping is aged for 18h in a water bath at 70℃, filtered by suction, washed several times with ultrapure water, put in an oven at 80℃ and dried for 12 hours, and the dried solid is obtained by grinding. Sample Mg / Fe-LDH.

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

[0040] 5) Measure 1...

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 of orange II and dissolve in 200ml of water, add 0.5g of MgFe-CLDH, mix and stir, stir for 12h, then suction filter, dry, and grind to obtain Mg / Fe The surface of CLDH is loaded with Orange II composite material. The composite material is calcined at 800℃ for 3h to obtain the magnesium-iron metal-based carbon nanomaterial.

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 dodecylbenzene sulfonate (LAS) and dissolve it in 200ml of water, add 0.5g of MgFe-CLDH for mixing and stirring, and after stirring for 12 hours, suction filtration and drying After grinding, the composite material of Mg / Fe-CLDH loaded with sodium dodecylbenzene sulfonate (LAS) can be obtained. The composite material is calcined at 800℃ for 3h to obtain the magnesium-iron metal-based carbon nanomaterial.

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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 nano material, in particular to a method for preparing a new type of magnesium-iron metal-based carbon nano material by using the waste material after the magnesium-iron hydrotalcite adsorbs organic pollutants or algae pollutants, and also relates to using it as The application of high-performance nitrogen adsorption materials 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 is highly chemically active. The electronegativity of nitrogen (3.04) is second only to fluorine, oxygen, chlorine and bromine, indicating that it can form strong 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 adsorption generally requires lo...

Claims

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Application Information

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