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Graphite phase carbon nitride porous microsphere and preparation method thereof

A technology of graphite phase carbon nitride and porous microspheres, applied in the field of photocatalytic materials, can solve the problems of serious recombination of photogenerated electron-hole pairs, low utilization rate of visible light, and limited popularization and application, and achieve regular structure, low cost, Effects from a wide range of sources

Active Publication Date: 2017-07-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the porous material prepared by this method is also a bulk phase structure, so the specific surface area is small, the band gap is large, the recombination of photogenerated electron-hole pairs is serious, and the utilization rate of visible light is low, which limits its large-scale application.

Method used

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  • Graphite phase carbon nitride porous microsphere and preparation method thereof
  • Graphite phase carbon nitride porous microsphere and preparation method thereof
  • Graphite phase carbon nitride porous microsphere and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] (1) At room temperature, put 5g of cyanamide in a crucible with a lid, heat it to 450°C in a horse-boiling furnace under air atmosphere, and roast it for 6h at a heating rate of 2°C / min. After cooling, a yellow solid powder graphite phase nitrogen is obtained. carbonization;

[0037](2) Disperse 0.5 g of the graphite phase carbon nitride obtained in 10 mL of sulfuric acid with a mass concentration of 40%, stir at 110° C. for 0.4 h, and cool down to room temperature after the graphite phase carbon nitride is completely dissolved to obtain graphite phase nitrogen carbonized sulfuric acid solution;

[0038] (3) Dilute the sulfuric acid solution of the obtained graphitic carbon nitride to 1 mg / mL with deionized water, then lower the temperature to 0° C., and let it stand for 5 hours to obtain a white precipitate;

[0039] (4) The obtained white precipitate was centrifuged, washed with deionized water until neutral, and dried at 80° C. for 24 hours to obtain graphite-phase ...

Embodiment 2

[0042] (1) At room temperature, put 5g of dicyandiamide in a crucible with a lid, heat it to 550°C in a horse-boiler furnace under air atmosphere, roast for 3h, the heating rate is 5°C / min, and obtain a yellow solid powder graphite phase after cooling carbon nitride;

[0043] (2) Disperse 1 g of the graphite phase carbon nitride obtained in 10 mL of sulfuric acid with a mass concentration of 60%, stir at 100° C. for 1 h, and cool down to room temperature after the graphite phase carbon nitride is completely dissolved to obtain the graphite phase carbon nitride sulfuric acid solution;

[0044] (3) Dilute the obtained sulfuric acid solution of graphitic carbon nitride to 1.5 mg / mL with deionized water, then lower the temperature to 10° C., and let stand for 5 hours to obtain a white precipitate;

[0045] (4) The obtained white precipitate was centrifuged, washed with deionized water until neutral, and dried at 80° C. for 24 hours to obtain graphite-phase carbon nitride porous m...

Embodiment 3

[0048] (1) At room temperature, put 5g of urea in a crucible with a lid, heat it to 650°C in a horse-boiling furnace under air atmosphere, and bake it for 1h at a heating rate of 20°C / min. After cooling, a yellow solid powder graphite phase nitriding is obtained. carbon;

[0049] (2) Disperse 1.5 g of the graphite phase carbon nitride obtained in 10 mL of sulfuric acid with a mass concentration of 80%, stir at 100° C. for 2 hours, and cool down to room temperature after the graphite phase carbon nitride is completely dissolved to obtain graphite phase nitride sulfuric acid solution of carbon;

[0050] (3) Dilute the obtained sulfuric acid solution of graphitic carbon nitride to 2.2 mg / mL with deionized water, then lower the temperature to 20° C., and let stand for 20 hours to obtain a white precipitate;

[0051] (4) The obtained white precipitate was centrifuged, washed with deionized water until neutral, and dried at 80° C. for 24 hours to obtain graphite-phase carbon nitrid...

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Abstract

The invention discloses a graphite phase carbon nitride porous microsphere. The graphite phase carbon nitride porous microsphere is a spherical nearly spherical particle, at least the surface of the microsphere has a porous structure, and pores are connected by graphite phase carbon nitride nanosheets. A preparation method of the graphite phase carbon nitride porous microsphere comprises the following steps: carrying out high temperature calcining on a nitrogen-containing compound used as a precursor to obtain graphite phase carbon nitride; dissolving the graphite phase carbon nitride in sulfuric acid; and re-crystallizing the graphite phase carbon nitride through changing the solvent condition of the above obtained graphite phase carbon nitride solution in order to obtain the graphite phase carbon nitride porous microsphere. The porous microsphere is obtained by interconnecting the nanosheets. The porous microsphere has a special porous structure, thereby inhibiting the agglomeration of the nanosheets. Raw materials used in the invention have wide sources, and the prepared graphite phase carbon nitride porous microsphere has the advantages of high specific surface area, regular structure, narrow pore size distribution and low cost.

Description

technical field [0001] The invention belongs to a photocatalytic material, in particular to a graphite-phase carbon nitride porous microsphere and a preparation method thereof. Background technique [0002] In recent years, graphitic carbon nitride, as a metal-free material, has received great attention from researchers. It can be used as an organic semiconductor photocatalyst. The matrix structure of each layer is a triazine or tris-triazine ring. The gaps are bridged by N atoms to form infinitely extended planes. A carbon-containing covalent compound composed of multilayer stacks in the form of graphite is a semiconductor material with better performance. On the other hand, the highly conjugated N lone pair electrons in the graphite-phase carbon nitride matrix structure can activate benzene, etc. Aromatic molecules, and the rich amine groups on the edge of the graphite-like layer make it have good alkalinity, due to the good chemical stability of graphite phase carbon nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J35/08
CPCB01J27/24B01J35/39B01J35/51B01J35/613B01J35/615B01J35/651B01J35/647
Inventor 黄志军袁国卿李峰波陈兵峰
Owner INST OF CHEM CHINESE ACAD OF SCI
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