Spherical mesoporous carbon nitride photocatalyst with multistage nano structure

A mesoporous carbon nitride photocatalyst and mesoporous carbon nitride technology are applied in the field of spherical mesoporous carbon nitride photocatalyst and its preparation, which can solve the problem that the mass transfer and diffusion of reaction substrates in nano-pores cannot be effectively promoted, and the photocatalysis is unfavorable. The reaction is efficiently carried out, hindering the chemical reaction of the inner surface, etc., to achieve the effect of easy recovery and recycling, high practical value, and improved hydrogen production activity

Active Publication Date: 2014-03-12
FUZHOU UNIVERSITY
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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 disadvantag

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  • Spherical mesoporous carbon nitride photocatalyst with multistage nano structure
  • Spherical mesoporous carbon nitride photocatalyst with multistage nano structure

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Example Embodiment

[0016] Example 1

[0017] Dissolve 2.5g tetraethyl silicate (TEOS) and 3.0mL pentanol in 30mL cyclohexane to prepare solution A; dissolve 1.0g cetylpyridinium bromide (CPB) and 0.8g urea into 30mL water Prepare solution B. The two solutions of A and B were mixed and stirred, and transferred into the microwave reaction kettle, and heated in a microwave at 413K for 4 hours. After the reaction, it was washed with water and acetone by centrifugation, dried, and calcined in a muffle furnace at 923K for 4 hours to obtain KCC-1 silica template. The template was mixed in 1.0mol / L HCl, 353K closed and stirred for 24h, and the template was acid treated. Centrifugation, drying, grinding. In a round-bottomed flask with a suction filter, add KCC-1 and cyanamide in step (2) with a mass ratio of 1:9. 4 HF 2 The silicon dioxide template is removed by etching with aqueous solution, washed with water, and dried to prepare spherical mesoporous carbon nitride with multi-level nanostructures.

Example Embodiment

[0018] Example 2

[0019] Dissolve 3.0g tetraethyl silicate (TEOS) and 2.0mL pentanol in 30mL cyclohexane to prepare solution A; dissolve 2.0g cetylpyridinium bromide (CPB) and 1.0g urea into 30mL water Prepare solution B. The two solutions of A and B were mixed and stirred, and moved into the microwave reaction kettle, and heated by 393K microwave for 6 hours. After the reaction, it was washed with water and acetone by centrifugation, dried, and calcined in a muffle furnace at 873K for 8 hours to obtain KCC-1 silica template. The templating agent was mixed in 2.0mol / L HCl, 353K sealed and stirred for 12h, and the templating agent was acid treated. Centrifugation, drying, grinding. In a round-bottomed flask with a suction filter, add KCC-1 and cyanamide of step (2) with a mass ratio of 1:5. 4 HF 2 The silicon dioxide template is removed by etching with aqueous solution, washed with water, and dried to prepare spherical mesoporous carbon nitride with multi-level nanostructures...

Example Embodiment

[0020] Example 3

[0021] Dissolve 2.5g tetraethyl silicate (TEOS) and 1.5mL pentanol into 30mL cyclohexane to prepare solution A; dissolve 1.0g cetylpyridinium bromide (CPB) and 0.6g urea into 30mL water Prepare solution B. Mix the two solutions of A and B with stirring, and transfer them into the microwave reaction kettle, and heat it with 393K microwave for 2h. After the reaction, it was washed with water and acetone by centrifugation, air-dried, and calcined in a muffle furnace at 823K for 6 hours to obtain KCC-1 silica template. The template was mixed in 1.0mol / L HCl, 353K closed and stirred for 24h, and the template was acid treated. Centrifugation, drying, grinding. In a round-bottomed flask with a suction filter, add KCC-1 and cyanamide in step (2) with a mass ratio of 1:8. 4 HF 2 The silicon dioxide template is removed by etching with aqueous solution, washed with water, and dried to prepare spherical mesoporous carbon nitride with multi-level nanostructures.

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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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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 UNIVERSITY
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