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A method for preparing porous boron carbon nitrogen nanosheets by freeze-drying

A drying treatment, nanosheet technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as the inability to effectively expand the specific surface area of ​​BCN nanosheets, and achieve easy monitoring and control, stable The effect of simple process conditions and operation procedures

Active Publication Date: 2019-03-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, all preparation methods have obtained BCN nanosheets with relatively complete sheet structure, but they cannot effectively expand the specific surface area of ​​BCN nanosheets.

Method used

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  • A method for preparing porous boron carbon nitrogen nanosheets by freeze-drying
  • A method for preparing porous boron carbon nitrogen nanosheets by freeze-drying
  • A method for preparing porous boron carbon nitrogen nanosheets by freeze-drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 0.62g of boric acid, 1.80g of glucose, and 0.60g of urea. The molar ratio of the three is 1:1:1, and the molar percentages are the same. Then put the three substances in a beaker, add 54mL of water and stir to dissolve, the molar ratio of water to raw material mixture is 100:1.

[0026] (2) Seal the beaker with an air-permeable film, put it into the refrigerator to condense and solidify, and then carry out freeze-drying treatment.

[0027] (3) Put the freeze-dried powder into a ceramic boat and place it in a tube furnace. Under the protection of a nitrogen atmosphere, the temperature was raised to 1000°C at a rate of 10°C / min, and kept for 5 hours.

[0028] (4) Put the calcined reaction product into a ball mill and mill it for 4 hours.

[0029] (5) After the product was cooled to room temperature, it was washed with deionized water until neutral to obtain Porous BCN nanosheets.

[0030] The scanning electron microscope picture of the Porous BCN nanosheet pr...

Embodiment 2

[0032] As described in Example 1, the difference is that the boron source is boron oxide in step (1):

[0033] Weigh 0.69g of boron oxide, 1.80g of glucose, and 0.60g of urea, and the molar ratio of the three is 1:1:1.

Embodiment 3

[0035] As described in Example 1, the difference is that the boron source in step (1) is ammonium borate: weigh 2.28 g of ammonium borate, 1.80 g of glucose, and 0.60 g of urea, and the molar ratio of the three is 1:1:1.

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Abstract

The invention provides a method for preparing porous boron-carbon-nitrogen nanosheets through freeze drying. The method includes the following steps that 1, a boron source, a carbon source and a nitrogen source are mixed in proportion, a raw material mixture is formed, water is added to dissolve the raw material mixture, and a raw material mixture solution is formed; 2, the raw material mixture solution is condensed and cured and then subjected to freeze drying; 3, powder obtained after freeze drying reacts for 0.5-12 h at the temperature of 800-1,200 DEG C in the atmosphere protection or vacuum environment; 4, the powder is ball-milled in a ball mill for 2-8 h; 5, after the ball-milled product is cooled to room temperature, the product is cleaned and dried, and the porous boron-carbon-nitrogen nanosheets are obtained. The method is simple in operation procedure, the yield can be increased, and the cost can be reduced. Various parameters in the reaction process are easy to monitor and control, the reaction mechanism can be easily studied, most critical influence factors are found out, and process conditions are stabilized as soon as possible; environmental protection is low, and environmental protection is promoted.

Description

technical field [0001] The invention relates to a method for preparing porous boron carbon nitrogen (porous BCN) nano sheets, belonging to the technical field of boron carbon nitrogen (BCN) nano material preparation. Background technique [0002] In recent years, two-dimensional materials have shown very promising application prospects in various fields due to their unique sheet structure and excellent physical, chemical and electrical properties. BCN nanosheets can simply be considered as a hybrid of hour-BN and graphene lattice structures in a two-dimensional plane. Since the content of various atoms in BCN nanosheets can be adjusted, BCN nanosheets have various structural forms, such as BCN, BC 2 N.BC 3 N and BC 6 N and so on, so the properties of BCN nanosheets are also variable. For example, when the C lattice structure of graphene is used as the substrate, after B atoms replace C atoms into the lattice, excess holes are generated, and N atoms replace into the latti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082B82Y30/00B82Y40/00
CPCC01B21/0828C01P2002/82C01P2004/03C01P2004/04C01P2004/60
Inventor 郝霄鹏马福坤吴拥中邵永亮
Owner SHANDONG UNIV
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