Preparation method of three-dimensional porous hexagonal boron nitride

A hexagonal boron nitride, three-dimensional porous technology, used in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of high apparent density of materials, complicated preparation methods, single pore structure, etc., and achieve low apparent density. , The effect of cheap equipment and high adsorption capacity

Inactive Publication Date: 2014-08-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The present invention provides a preparation method of three-dimensional porous hexagonal boron nitride for the cumbersome preparation method of the existing three-dimensional porous hexagonal boron nitride. The

Method used

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  • Preparation method of three-dimensional porous hexagonal boron nitride
  • Preparation method of three-dimensional porous hexagonal boron nitride
  • Preparation method of three-dimensional porous hexagonal boron nitride

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[0044] Example 1

[0045] The preparation method of hexagonal boron nitride includes the following steps:

[0046] (1) Mix 1 part of boron nitride precursor borane ammonia and 0.4 part of active agent thiourea uniformly and put it into corundum crucible;

[0047] (2) Place the corundum crucible in the middle of the heating zone of the high-temperature horizontal tube furnace, and vacuum the high-temperature tube furnace to 10pa;

[0048] (3) Pass the inert gas N at a flow rate of 40sccm 2 , 80min from room temperature to 1200℃ and react for 2h; 60min after cooling to 700℃ and then naturally cooling to room temperature, the three-dimensional porous hexagonal boron nitride material can be obtained.

[0049] The hexagonal boron nitride obtained according to the above method presents a white, light and fluffy three-dimensional porous sheet structure, and its apparent density is as low as 2.7mg / cm 3 、The adsorption capacity of carbon tetrachloride is as high as 19100wt%, and the BET specific...

Example Embodiment

[0050] Example 2

[0051] Except that no active agent was added, the same method as in Example 1 was used to prepare hexagonal boron nitride.

[0052] From this experiment, the apparent density can be 27.8mg / cm 3 , Three-dimensional porous hexagonal boron nitride with a yield of 53%. In the absence of the crosslinking effect of the active agent, the thickness of the boron nitride lamella increases, the area of ​​the lamella decreases, and the yield decreases.

Example Embodiment

[0053] Example 3

[0054] Except for changing the mass ratio of the active agent thiourea to borane ammonia to 0.2:1, the same method as in Example 1 was used to prepare hexagonal boron nitride.

[0055] From this experiment, the apparent density is 7.1mg / cm 3 , Hexagonal boron nitride with a three-dimensional porous sheet structure with a yield of 62%. The content of thiourea is relatively small, and the crosslinking effect is not significant.

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Abstract

The invention discloses a preparation method of three-dimensional porous hexagonal boron nitride. The preparation method comprises steps as follows: step one, a precursor is placed into a crucible, wherein the precursor comprises a nitrogen source and a boron source, the nitrogen source is one or more of ammonia, urea, sodium azide, pyridine, melamine and ammonia borane, and the boron source is one of boron powder, boron oxide, boric acid, ammonium borate, sodium borohydride, boron carbide and ammonia borane; step two, the crucible is placed in a high-temperature furnace, vacuum pumping is performed to 1-40 Pa, gas is introduced and oxygen is eliminated; step three, the temperature is increased to 900-1,600 DEG C in 10 min-4 h, and a reaction is performed for 0.5-5 h; and the temperature is reduced to the room temperature, and three-dimensional porous hexagonal boron nitride is obtained. The preparation method of three-dimensional porous hexagonal boron nitride is simple in technology, complex raw material pretreatment and follow-up treatment are not needed, the repeatability is good, batch preparation can be achieved, and industrialized application is easy to achieve.

Description

technical field [0001] The invention relates to a three-dimensional porous nanometer material, in particular to a preparation method of a three-dimensional porous hexagonal boron nitride, and belongs to the technical field of new materials. Background technique [0002] Graphene is a single-layer carbon atom material exfoliated from graphite materials. It is a two-dimensional structure of carbon. Because of its unique structure and excellent performance, graphene-like structure materials have attracted widespread attention since their discovery in 2004. (K.S. Novoselov, A.K. Geim, S.V. Morozov, Science. 2004, 306, 666). [0003] Hexagonal boron nitride is a typical group III-V compound with a band gap of 5.9eV. It has a layered structure similar to graphite. It is an isoelectronic body with graphite. B and N atoms completely replace the C atoms in the graphite sheet structure and basically Does not change the atomic distance, known as white graphite. Two-dimensional hexago...

Claims

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Application Information

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IPC IPC(8): C01B21/064
Inventor 曾海波赵会结宋秀峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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