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Carbon nitride photocatalyst with three-dimensional ordered macroporous structure and preparation method of carbon nitride photocatalyst

A three-dimensional ordered, porous structure technology, applied in the field of photocatalysis, can solve the problems of complex synthesis method of ordered mesoporous carbon nitride, difficult to adjust the size of mesoporous channels, unsupported, etc. Practical value, high stability effect

Active Publication Date: 2015-05-13
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, the synthesis method of copolymerized modified ordered mesoporous carbon nitride disclosed in this patent document is complicated, the cost is high, the size of mesoporous channels is difficult to adjust, and other materials with larger particle sizes cannot be loaded.

Method used

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  • Carbon nitride photocatalyst with three-dimensional ordered macroporous structure and preparation method of carbon nitride photocatalyst
  • Carbon nitride photocatalyst with three-dimensional ordered macroporous structure and preparation method of carbon nitride photocatalyst
  • Carbon nitride photocatalyst with three-dimensional ordered macroporous structure and preparation method of carbon nitride photocatalyst

Examples

Experimental program
Comparison scheme
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Embodiment 1）

[0036] The carbon nitride photocatalyst with three-dimensional ordered macroporous structure of this embodiment is a kind of organic polymer semiconductor photocatalyst, and chemical formula is C 3 N 4 , the preparation method comprises the following steps:

[0037] ① Prepare a three-dimensional ordered silica ball array template.

[0038] Mix and stir 60g ethanol, 12g water, and 4g ammonia water (28wt%) to obtain a mixed solution; add 6mL tetraethyl orthosilicate (CAS NO. 78-10-4) to the mixed solution, stir for 3 hours, and then react The obtained material is centrifuged to remove the centrifuged mother liquor, the centrifuged precipitate is washed with ethanol, and then dried at 80° C. to obtain silica spheres.

[0039] Ultrasonic disperse the silica spheres obtained above in 80 mL of ethanol, and the surface of the suspension obtained after ultrasonic dispersion is covered with a film, and left to stand until the suspension slowly evaporates to dryness, and the obtained ...

Embodiment 2）

[0053] The preparation method of the carbon nitride photocatalyst with three-dimensional ordered macroporous structure of the present embodiment is the same as the embodiment, the difference is:

[0054] Step ① When preparing a three-dimensional ordered silica ball array template, mix and stir 50g ethanol, 10g water, and 3g ammonia water (28 wt%%) to obtain a mixed solution, and add 5mL tetraethylorthosilicate to the obtained mixed solution After stirring for 4 hours, centrifuge the material obtained after the reaction, remove the centrifuged mother liquor, wash the precipitate obtained by centrifugation with ethanol, and then dry it at 80°C to obtain silica balls.

[0055] The obtained silica spheres were ultrasonically dispersed in 8 mL of ethanol, and the obtained suspension was centrifuged at a high speed of 10,000 r / min. After discarding the ethanol, it was dried to obtain a three-dimensional ordered silica sphere array template; The concentration of silica balls is 80-12...

Embodiment 3）

[0061] The preparation method of the carbon nitride photocatalyst with three-dimensional ordered macroporous structure of the present embodiment is the same as the embodiment, the difference is:

[0062] Step ① When preparing a three-dimensional ordered silica ball array template, mix 50 g of ethanol, 15 g of water, and 5 g of ammonia water (28wt%%) to obtain a mixed solution, and add 5 mL of tetraethyl orthosilicate to the obtained mixed solution ester.

[0063] The carbon nitride photocatalyst prepared in this example has a three-dimensional ordered porous morphology with a large area and regular arrangement, and the macropore cavity is spherical with a diameter of 120nm-150nm. The distance between the centers of two adjacent macropores is 130nm-160nm.

[0064] According to the method of Example 1, the hydrogen production rate of the carbon nitride photocatalyst with a three-dimensional ordered macroporous structure prepared in this example was 160 μmol / h.

[0065] The sca...

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Abstract

The invention discloses a carbon nitride photocatalyst with a three-dimensional ordered macroporous structure and a preparation method of the carbon nitride photocatalyst. The carbon nitride photocatalyst has the regularly arranged three-dimensional ordered microporous morphology, a macroporous cavity is spherical, and the diameter of the macroporous cavity is 100-300nm; the distance between two adjacent macroporous sphere centers is 110-350nm. A scanning electron microscope picture of the carbon nitride photocatalyst shows that the carbon nitride photocatalyst has the three-dimensional ordered macroporous structure, the macroporous cavity is spherical, and the diameter of the macroporous cavity is 100-300nm; the macroporous structure is high in specific surface area, and the ordered macroporous cavity can be internally loaded with other materials on one hand and is easy in mass transfer on the other hand, so that a photo-generated carrier can be rapidly separated in reaction. According to the carbon nitride photocatalyst disclosed by the invention, the structure is capable of remarkably improving the photocatalytic performance of the catalyst, and the carbon nitride photocatalyst is high in photolysis hydrogen production from water under visible lights and is capable of realizing efficient solar photolysis hydrogen production from water.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a carbon nitride photocatalyst with a three-dimensional ordered macropore structure and a preparation method thereof. Background technique [0002] Semiconductor photocatalysis is the generation of electron-hole pairs by semiconductor catalysts under the action of visible light or ultraviolet light, and O 2 、H 2 O and pollutant molecules accept photogenerated electrons or holes, and a series of redox reactions occur in a photochemical method. [0003] Carbon nitride is an organic polymer semiconductor. Because of its characteristics of responding to visible light, relatively stable and non-toxic in water, and relatively easy to prepare, it has attracted widespread attention of scientific researchers. Carbon nitride has potential application prospects in the fields of photocatalysis, heterogeneous catalysis, and fuel cells, especially in the catalytic decompo...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C01B21/082
CPCY02E60/36Y02P20/133
Inventor 曹鑫孙建华王宇谦刘玉海张慧
Owner JIANGSU UNIV OF TECH