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Preparation method for copolymerize-modified graphite-phase carbon nitride visible light catalyst

A graphitic carbon nitride and copolymerization technology is applied in the directions of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to improve the performance of photo-splitting water for hydrogen production and the process is simple , the effect of low cost

Inactive Publication Date: 2017-12-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, the current method of copolymerization modified graphite phase carbon nitride is mainly through thermosolid phase polymerization after mixing aromatic small molecules and carbon nitride precursors, and the obtained materials have many defects.

Method used

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  • Preparation method for copolymerize-modified graphite-phase carbon nitride visible light catalyst
  • Preparation method for copolymerize-modified graphite-phase carbon nitride visible light catalyst
  • Preparation method for copolymerize-modified graphite-phase carbon nitride visible light catalyst

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preparation example Construction

[0025] Preparation of graphitic carbon nitride. The invention uses urea as a raw material, and firstly calcines the urea in a muffle furnace to prepare graphite phase carbon nitride. The calcination temperature of urea is 500-550 degrees Celsius. The calcination time is 1-2 hours. Due to the reaction kinetics at this temperature, the polymerization is incomplete, and pure crystalline graphite phase carbon nitride cannot be obtained, and some amino defects (amino groups) will remain in the carbon nitride sheet structure.

[0026] The present invention uses graphite phase silicon nitride and small aromatic molecules as raw materials, mixes them uniformly, raises the temperature (the heating rate can be 5°C / min) to the boiling point temperature of the small aromatic molecules, and makes the small aromatic molecules The aldehyde group in the graphite phase undergoes a Schiff base reaction with the amino group on the edge of carbon nitride in the graphite phase, and is connected ...

Embodiment 1

[0033] Weigh 20g urea into Al 2 o 3 Cover the crucible, place it in a muffle furnace for calcination, heat up to 550°C at a heating rate of 5°C / min, keep warm for 2h, cool naturally to room temperature, and grind to obtain graphitic carbon nitride (CN). Weigh 1g of the graphite-phase carbon nitride (CN) obtained above, and mix them with 1mg, 5mg, 10mg, 50mg, 0.1g of terephthalaldehyde in the solid phase, and then put in Al 2 o 3 Put a cover in the crucible, place it in a muffle furnace for calcination, heat up at a rate of 5°C / min, heat to 250°C, keep it warm for 5h, cool naturally to room temperature, and grind to obtain copolymerized modified graphite phase carbon nitride (CNT-x ), wherein T represents terephthalaldehyde, and x represents the mass percentage of terephthalaldehyde and CN added, and the values ​​are 0.1, 0.5, 1, 5, 10. The UV-vis absorption spectrum of the prepared CNT-x visible light catalyst is as attached figure 1 shown by figure 1 It can be seen that ...

Embodiment 2

[0035] Weigh 20g of urea into Al 2 o 3 Cover the crucible, place it in a muffle furnace for calcination, heat up to 550°C at a heating rate of 5°C / min, keep warm for 2h, cool naturally to room temperature, and grind to obtain graphitic carbon nitride (CN). Weigh and take 1g of the graphite phase carbon nitride (CN) obtained above, and mix it with 1mg of different aldehyde-containing aromatic small molecules (indole-3-carbaldehyde, 2-naphthaldehyde, pyrrole-2-carbaldehyde, 9 - formaldehyde phenanthrene, terephthalaldehyde, 2,5-thiophene dicarbaldehyde, 2-quinoline formaldehyde, 3-formylbenzothiophene) solid phase mixing, put into Al 2 o 3 Cover the crucible, place it in a muffle furnace for calcination, heat up at a rate of 5°C / min, heat to the boiling point of small aromatic molecules, keep it warm for 5 hours, cool naturally to room temperature, and grind to obtain graphite phase nitrogen modified with different aromatic rings carbonized. The photohydrogen production diag...

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Abstract

The invention relates to a preparation method for a copolymerize-modified graphite-phase carbon nitride visible light catalyst. The method includes the steps of: calcining urea in a muffle furnace at 500-550 DEG C to form a graphite-phase carbon nitride material with surface amino group defects; uniformly mixing the graphite-phase carbon nitride material with a proper amount of aromatic small molecules containing aldehyde groups, and calcining the mixture in the muffle furnace to produce the copolymerize-modified graphite-phase carbon nitride visible light catalyst. The method greatly optimizes and enriches the synthesis technologies of copolymerize-modified graphite-phase carbon nitride in the prior art and has significant effect of increasing the performance of photolyzing water to produce hydrogen of the catalyst.

Description

technical field [0001] The invention relates to a simple synthesis design scheme of aromatic ring modified graphite phase carbon nitride, which belongs to the technical field of environmental catalytic materials. Background technique [0002] Environmental pollution and energy issues seriously restrict the sustainable development of human beings and society. Photocatalytic water hydrogen production technology can use solar energy to decompose water to produce hydrogen, and convert low-density solar energy into high-density clean hydrogen energy, which is a hot research topic at present. [0003] Graphite carbon nitride is a typical polymer semiconductor, and the C and N atoms in the structure are represented by sp 2 Hybridization forms highly delocalized π-conjugated systems. The band gap is 2.7eV, and it can absorb blue-violet light with a wavelength less than 450nm in the solar spectrum. It has the advantages of high stability (high stability and chemical inertness in p...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01J27/24
CPCB01J27/24B01J31/0271B01J35/39
Inventor 田建建张玲霞施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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