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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  • Abstract
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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 has simple steps, and the prepared three-dimensional porous hexagonal boron nitride has the characteristics of low apparent density, good adsorption performance, high yield and multi-level pore size distribution

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

Examples

Experimental program
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Embodiment 1

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

[0046] (1) Evenly mix 1 part of borane ammonia, the precursor of boron nitride, with 0.4 part of active agent thiourea, and put it into a corundum crucible;

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

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

[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 2.7 mg / cm 3 , The adsorption capacity of carbon tetrachloride is as high as 19100wt%, and the BET specific surface...

Embodiment 2

[0051] Hexagonal boron nitride was prepared by the same method as in Example 1 except that no active agent was added.

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

Embodiment 3

[0054] Hexagonal boron nitride was prepared by the same method as in Example 1, except that the mass ratio of active agent thiourea to borane ammonia was changed to 0.2:1.

[0055] From this experiment, an apparent density of 7.1 mg / cm can be obtained 3 , Hexagonal boron nitride with a three-dimensional porous sheet structure with a yield of up to 62%. The content of thiourea is relatively small, and the cross-linking 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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