A kind of three-dimensional porous boron carbon nitrogen material and its preparation method and application
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A three-dimensional porous, boron-carbon-nitrogen technology, applied in the field of nanomaterial preparation and photocatalysis, to achieve the effects of mild and controllable conditions, low price and stable catalyst
Active Publication Date: 2021-03-30
FUZHOU UNIV
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Currently, reports on boron carbon nitrogen (BCN) materials are mainly focused on one-dimensional (1D) structures, such as boron carbon nitrogen nanosheets (Nat. Commun., 2015, 6, 7698; Chem. Eur.J. 2016, 22, 7134-7140), two-dimensional (2D) structures, such as boron carbon nitride nanotubes (Chem. Commun., 2017, 53, 11988-11991; J. Am. Chem. Soc. 2007, 129(6), 1705 −1716; J. Am.Chem. Soc. 2006, 128, 6530−6531), the corresponding three-dimensional porous boron carbon nitrogen structure is rarely reported
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Embodiment 1
[0024] Take 0.5 g of boric acid, 1 g of urea and 2.5 g of starch in a 25 mL beaker, add 5 mL of pure water and 2.5 g of sodium chloride, and dissolve them by ultrasonic waves, and then stand at room temperature and pressure for 3 h to obtain a three-dimensional Porous hydrogel precursor, take out the precursor, place it in a corundum ark, and put it into a horizontal high-temperature tube furnace. After heating up to 1000 ℃ and heat treatment for 5 h, the three-dimensional porous boron carbon nitrogen material can be obtained.
Embodiment 2
[0026] Take 1 g of boric acid, 2 g of urea and 5 g of starch in a 25 mL beaker, add 10 mL of pure water and 5 g of sodium chloride, and dissolve them by ultrasonic waves, and then stand at room temperature and pressure for 4 h to obtain a three-dimensional The porous hydrogel precursor was taken out, placed in a corundum ark, and placed in a horizontal high-temperature tube furnace, under an ammonia atmosphere (flow rate of 200 mL / min), at a heating rate of 5 ℃ / min After heating up to 1250 ℃ and heat treatment for 5 h, the three-dimensional porous boron carbon nitrogen material can be obtained.
Embodiment 3
[0028] Take 1 g of boric acid, 2 g of urea and 5 g of starch in a 25 mL beaker, add 10 mL of pure water and 3 g of sodium chloride, and dissolve them by ultrasonic waves, and then stand at room temperature and pressure for 2 h to obtain a three-dimensional The porous hydrogel precursor was taken out, placed in a corundum ark, and placed in a horizontal high-temperature tube furnace, under an ammonia atmosphere (flow rate: 300 mL / min), at a heating rate of 5 °C / min After heating up to 1100 ℃ and heat treatment for 8 h, the three-dimensional porous boron carbon nitrogen material can be obtained.
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Abstract
The invention belongs to the technical field of nanometer material preparation, and relates to a three-dimensional porous boron carbonitride material, as well as a preparation method and application thereof in the field of photocatalysis. The method comprises the following steps: by adopting boric acid, urea and starch as raw materials, mixing with sodium chloride salt, adding an appropriate amount of water, carrying out ultrasonic processing for dissolving, uniformly mixing, standing under normal pressure and temperature, self-forming a precursor with a three-dimensional porous structure after several hours, carrying out high temperature heat polymerization under an ammonia atmosphere, and synthesizing to obtain the three-dimensional porous boron carbonitride material. The preparation method provided by the invention has the advantages of simple process, cheap materials, and mild and controllable conditions. The obtained boron carbonitride material is remarkably increased in specificsurface area, smaller in pore diameter, remarkably improved in charge separation, and favorable in photocatalytic performance, and has wide application in the fields such as photoelectricity, catalysis, organic pollutant photodegradation and adsorption, and energy storage.
Description
technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a three-dimensional porous boron carbon nitrogen material, a preparation method thereof and an application thereof in the field of photocatalysis. Background technique [0002] Three-dimensional porous (3D porous) materials have received extensive attention and research in recent years due to their low density, high porosity, better thermal / chemical stability and higher specific surface area (Chem. Rev., 2014, 114 , 9487-9558; Chem. Rev. 2015, 115, 6265-6311; Chem. Soc. Rev. 2016, 45, 5541-5588; Energy Environ. Sci. 2013, 6, 41-53). Based on these characteristics, three-dimensional porous materials have been widely used in various fields, such as capacitors with ultra-high performance (Energy Environ. Sci. 2013, 6, 2497-2504; ACS Nano 2013, 7, 9366-9374), electro- Color-changing devices (Adv. Funct. Mater. 2015, 25, 6900-6905), photo / electrocatalysts (ACS Appl. Ma...
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