Spherical mesoporous carbon nitride photocatalyst with multistage nano structure

A technology of mesoporous carbon nitride light and mesoporous carbon nitride, which is applied in the field of spherical mesoporous carbon nitride photocatalysts and its preparation, can solve the problem of inability to effectively promote the mass transfer and diffusion of reaction substrates in nanopores and unfavorable photocatalysis Efficient reaction, hindering the chemical reaction on the inner surface, etc., to achieve the effect of easy recycling, high practical value, and improved hydrogen production activity

Active Publication Date: 2015-04-15
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the surface structure of these traditional mesoporous carbon nitride nanomaterials is still relatively "closed", which cannot effectively promote the mass transfer and diffusion of reaction substrates in nanopores, and it is difficult to give full play to the special physical and chemical properties of polymer semiconductors to overcome polymer The purpose of the disadvantages of low photogenerated carrier mobility and serious recombination in semiconductors
For example, the hollow spherical carbon nitride with the highest photolysis efficiency at present, the nanopores on the wall will collapse when the template agent is removed, which hinders the chemical reaction on the inner surface, which is not conducive to the efficient progress of the photocatalytic reaction.

Method used

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  • Spherical mesoporous carbon nitride photocatalyst with multistage nano structure

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Dissolve 2.5g tetraethyl silicate (TEOS) and 3.0mL pentanol in 30mL cyclohexane to form solution A; dissolve 1.0g cetylpyridinium bromide (CPB) and 0.8g urea in 30mL water Dubbed solution B. The two solutions of A and B were mixed and stirred, and transferred into a microwave reactor, and heated by microwave at 413K for 4h. After the reaction, it was centrifuged and washed with water and acetone, dried in the air, and calcined in a muffle furnace at 923K for 4 hours to obtain the KCC-1 silica template. Dissolve the template agent in 1.0 mol / L HCl, close and stir at 353K for 24 hours, and carry out acid treatment on the template agent. Centrifuge, dry and grind. In a round-bottomed flask with a suction filter, add KCC-1 and cyanamide in step (2) with a mass ratio of 1:9, and treat with "ultrasonic + heating (328K)" for 6 hours under vacuum (4 HF 2 The silicon dioxide template is removed by aqueous solution etching, washed with water, and dried to prepare spherical mes...

Embodiment 2

[0019] Dissolve 3.0g tetraethyl silicate (TEOS) and 2.0mL pentanol in 30mL cyclohexane to form solution A; dissolve 2.0g cetylpyridinium bromide (CPB) and 1.0g urea in 30mL water Dubbed solution B. The two solutions of A and B were mixed and stirred, and transferred into a microwave reactor, and heated by microwave at 393K for 6h. After the reaction, it was centrifuged and washed with water and acetone, dried in the air, and calcined in a muffle furnace at 873K for 8 hours to obtain the KCC-1 silica template. Dissolve the template agent in 2.0 mol / L HCl, close and stir at 353K for 12 hours, and carry out acid treatment on the template agent. Centrifuge, dry and grind. In a round-bottomed flask with a suction filter, add KCC-1 and cyanamide in step (2) with a mass ratio of 1:5, and treat with "ultrasonic + heating (333K)" for 6 hours under vacuum (4 HF 2 The silicon dioxide template is removed by aqueous solution etching, washed with water, and dried to prepare spherical mes...

Embodiment 3

[0021] Dissolve 2.5g tetraethyl silicate (TEOS) and 1.5mL amyl alcohol into 30mL cyclohexane to form solution A; dissolve 1.0g cetylpyridinium bromide (CPB) and 0.6g urea into 30mL water Dubbed solution B. The two solutions of A and B were mixed and stirred, and transferred into a microwave reactor, and heated by microwave at 393K for 2h. After the reaction, it was centrifuged and washed with water and acetone, dried in the air, and calcined in a muffle furnace at 823K for 6 hours to obtain the KCC-1 silica template. Dissolve the template agent in 1.0 mol / L HCl, close and stir at 353K for 24 hours, and carry out acid treatment on the template agent. Centrifuge, dry and grind. In a round-bottomed flask with a suction filter, add KCC-1 and cyanamide in step (2) with a mass ratio of 1:8, and treat with "ultrasonic + heating (328K)" for 4 hours under vacuum (4 HF 2The silicon dioxide template is removed by aqueous solution etching, washed with water, and dried to prepare spheri...

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Abstract

The invention discloses a spherical mesoporous carbon nitride photocatalyst with a multistage nano structure and a preparation method and application thereof and belongs to the technical field of material preparation and photocatalysis. The spherical mesoporous carbon nitride photocatalyst with the multistage nano structure is prepared by using cyanamide as a precursor, using spherical mesoporous silicon dioxide with a highly open structure as a hard template, carrying out thermal thermal polymerization and removing the hard template. The spherical mesoporous carbon nitride prepared by the preparation method has the characteristic that nanosheet or nanosheet-like small particles are uniformly diffused around from the sphere center to form a spherical micro nano structure of which the surface structure is highly open; compared with conventional bulk phase carbon nitride, the spherical mesoporous carbon nitride photocatalyst can obviously improve the specific surface area and the mass transfer effect and has efficient photocatalytic hydrogen production performance in the visible light. The spherical mesoporous carbon nitride photocatalyst adopts a simple synthetic process, has high catalysis efficiency and has wide application prospect in the field of catalysis / photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a spherical mesoporous carbon nitride photocatalyst with a multi-level nanostructure and its preparation method and application. Background technique [0002] Energy is the material basis of human activities, and the development of human society is inseparable from the application and development of high-quality energy. Semiconductor photocatalysis technology, by using sunlight to drive chemical reactions, such as photocatalytic water splitting to produce hydrogen (Chem. Rev. 2010, 110, 6503), CO 2 Fixed reduction (Chem. Rev. 2001, 101, 953), selective organic redox reaction, pollutant degradation and mineralization (Chem. Rev. 1995, 95, 69), etc., convert low-density solar energy into high-density Chemical energy has broad application prospects in solving energy and environmental problems. At present, hundreds of photocatalytic mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02C01B21/082C01B3/04B82Y30/00B82Y40/00
CPCY02E60/364Y02E60/36
Inventor 王心晨张明文张金水
Owner FUZHOU UNIV
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