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A kind of preparation method and application of boron hexaoxide

A boron powder and reaction technology, applied in the field of photocatalytic materials, can solve the problems of unfavorable large-scale application, poor stability and easy deactivation, etc., and achieve the effect of favorable catalytic reaction, high stability and good visible light catalytic activity

Active Publication Date: 2021-04-13
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most traditional photocatalysts generally contain transition metals or even noble metals. The photoresponse of some photocatalysts is mainly in the ultraviolet region, and has no response to visible light, and their poor stability is easy to deactivate, which is not conducive to large-scale applications.

Method used

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  • A kind of preparation method and application of boron hexaoxide
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  • A kind of preparation method and application of boron hexaoxide

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Experimental program
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Effect test

Embodiment 1

[0029] Preparation of boron hexaoxide

[0030] (1) Place the amorphous boron powder in a tube furnace, and bake it at 1200°C for 600 minutes under an argon atmosphere to convert it into boron powder with a certain degree of crystallinity;

[0031] (2) Add 1 g of boron powder with crystallinity obtained in step (1) into 100 mL of 30 wt % hydrogen peroxide solution, then ultrasonically disperse with an ultrasonic instrument at 20° C. for 20 minutes, and then react at 60° C. for 60 minutes;

[0032] (3) Step (2) After the reaction in step (2), centrifuge and separate, wash three times with deionized water and ethanol respectively, and then dry the obtained powder in an oven at 60° C. for 6 hours to obtain boron hexaoxide.

[0033] tested as figure 1 The X-ray diffraction pattern is shown, and the purity of boron hexaoxide is >98%.

Embodiment 2

[0035] Preparation of boron hexaoxide

[0036] (1) Place the amorphous boron powder in a tube furnace, and calcine it at 1000°C for 120 minutes under an argon atmosphere to convert it into boron powder with a certain degree of crystallinity;

[0037] (2) Slowly add 1 g of boron powder with crystallinity obtained in step (1) into 100 ml of 60 wt % concentrated nitric acid solution, and then react at 70° C. for 60 min;

[0038] (3) The solution after the reaction in step (2) was diluted and centrifuged, washed three times with deionized water and ethanol respectively, and then the obtained powder was dried in an oven at 80° C. for 6 hours to obtain boron hexaoxide.

[0039] tested as figure 2 The X-ray diffraction pattern is shown, and the purity of boron hexaoxide is >98%.

Embodiment 3

[0041] Preparation of boron hexaoxide

[0042] (1) Raw material boron powder adopts boron powder with crystallinity. Add 1g of boron powder with crystallinity into 100mL of 30wt% hydrogen peroxide solution, then ultrasonically disperse with an ultrasonic instrument at 20°C for 10min, and then react at 100°C for 240min;

[0043] (2) The solution after the reaction in step (1) was diluted and then centrifuged, washed three times with deionized water and ethanol respectively, and then the obtained powder was oven-dried at 50° C. for 6 hours to obtain boron hexaoxide.

[0044] After testing, the purity of boron hexaoxide is >99%.

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Abstract

The invention discloses a preparation method and application of boron hexaoxide. The present invention uses boron powder as a raw material, oxidizes crystalline boron, and utilizes its oxidation exothermic reaction to synthesize boron hexaoxide at low temperature, namely B 6 O. The preparation method of the present invention has low cost, low energy consumption and simple synthesis process, and the obtained boron hexaoxide has strong visible light absorption, and is first applied to photocatalytic decomposition of water to produce hydrogen and photocatalytic reduction of carbon dioxide, all of which show high stability and good performance. Visible light catalytic activity, and itself is a non-metallic photocatalyst, so it can have high scientific significance and application value in the field of new energy development.

Description

technical field [0001] The invention relates to a photocatalytic material, in particular to a preparation method and application of boron hexaoxide. Background technique [0002] Boron hexoxide belongs to the light element α-rhombic boron-rich compound, which has light weight, superhardness, high melting point, high strength, high elastic modulus and excellent high-temperature thermoelectric properties, especially suitable for extreme operating environments, such as mining, petrochemical , Armor and nuclear industry. The traditional production of boron hexaoxide is by mixing boron powder and diboron trioxide and roasting at a high temperature of 1200-1800°C under the protection of an inert atmosphere. There are problems such as high cost and high energy consumption. Therefore, it is of great scientific significance and application value to develop a synthetic method with low cost, low energy consumption and simple preparation method. [0003] Photocatalytic water splitting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10C01B3/04C01B32/50
CPCC01B3/042C01B35/1027C01P2002/72C01P2006/80C01B32/50Y02E60/36
Inventor 刘冀锴颜德健罗和安
Owner XIANGTAN UNIV
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