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Curly carbon nitride sheet and preparation method thereof, and application of curly carbon nitride sheet in photocatalytic decomposition of water into hydrogen

A technology of carbon nitride and flakes, applied in the field of preparing and curling carbon nitride flakes, can solve the problems of increasing cost, polluting the environment, high pressure, organic solvents, etc., and achieve the effect of improving efficiency, high output and meeting the requirements of industrialization.

Inactive Publication Date: 2020-03-17
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, the preparation process of highly active carbon nitride often involves steps such as high pressure, organic solvents, environmental pollution or cost increase.

Method used

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  • Curly carbon nitride sheet and preparation method thereof, and application of curly carbon nitride sheet in photocatalytic decomposition of water into hydrogen
  • Curly carbon nitride sheet and preparation method thereof, and application of curly carbon nitride sheet in photocatalytic decomposition of water into hydrogen
  • Curly carbon nitride sheet and preparation method thereof, and application of curly carbon nitride sheet in photocatalytic decomposition of water into hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Melamine solution A and cyanuric acid solution B were prepared by dissolving 1 g of melamine and 1 g of cyanuric acid in deionized water in a water bath at 60 degrees Celsius and stirring for 2 hours.

[0025] (2) Add solution B in step (1) to solution A, and continue heating the mixed suspension in a water bath at 60 degrees Celsius for 2 hours. The white product was centrifuged and washed three times with water and ethanol respectively, and dried in an oven at 100 degrees Celsius for 12 hours to obtain a white solid.

[0026] (3) Disperse 1.5 g of the white solid in step (3) in a mixed solution of 45 mL of ethanol and 15 mL of glycerol and ultrasonicate for 30 minutes, and heat the uniformly dispersed suspension to reflux in an oil bath at 90 degrees Celsius for 3 hours. The white product was centrifuged, washed three times with water and ethanol, and then dried in an oven at 100°C for 12 hours.

[0027] (4) Grind the white product of step (4) into a fine powder,...

Embodiment 2

[0030] (1) 5 g of melamine was placed in a crucible, and the crucible was heated in a muffle furnace at 500 degrees Celsius (with a heating rate of 2 degrees Celsius per minute) for 2 hours under air.

[0031] (2) Grinding the product obtained in step (1) into a fine powder to obtain bulk carbon nitride.

[0032] (3) On the bulk phase carbon nitride powder obtained by step (2), the method for reducing chloroplatinic acid by sodium borohydride is loaded on the bulk phase carbon nitride surface with 1wt% platinum and dispersed in the solution (volume fraction 90% water and 10% triethanolamine), the photocatalytic hydrogen production rate is 108 micromole / hour / gram.

[0033] Based on the above examples, we draw the following further conclusions: the activity of the curly carbon nitride flake photocatalyst prepared in Example 1 of the present invention to catalyze the decomposition of water to produce hydrogen under visible light is far greater than that of the photocatalyst pre...

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Abstract

The invention discloses a curly carbon nitride sheet, a preparation method and application of the curly carbon nitride sheet in photocatalytic decomposition of water into hydrogen, and belongs to thetechnical field of photocatalysis. According to the preparation method of the curly carbon nitride sheet, melamine and cyanuric acid are taken as raw materials, and the curly carbon nitride sheet is prepared by gasifying glycerol under a low temperature and a normal pressure to peel off carbon nitride under calcination. Compared with a common method, safer normal-pressure low-temperature self-assembly is adopted, operation is easy and convenient, the yield is high, and water serves as a solvent and is more environmentally friendly compared with self-assembly of a precursor in an organic solvent. The visible light catalysis capability of the carbon nitride is also greatly enhanced. The curly sheet structure greatly enhances the specific surface area of the material and reduces the band gapwidth of the material, thereby greatly enhancing the visible light absorption of the materials, providing sufficient reaction sites for the photocatalytic water decomposition reaction, and further enhancing the visible light catalytic water decomposition rate. The industrial production is easy to realize, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a curly carbon nitride sheet, a preparation method and its application in photocatalytic decomposition of water to produce hydrogen. Background technique [0002] Carbon nitride has become the most widely studied visible light catalyst so far due to its good thermal stability, chemical stability and suitable bandgap width. So far, the most convenient synthesis method of carbon nitride is the thermal condensation polymerization method, which directly calcines nitrogen-rich precursors such as urea, melamine, dicyandiamide, and cyanamide at 500-600 degrees Celsius. However, due to the bulk structure of carbon nitride synthesized by this method, the wide band gap has a weak response to visible light, and the low specific surface area cannot provide sufficient reaction sites, which leads to its low photocatalytic reactivity. In order to improve this phenomenon and ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02B01J35/10C01B3/04C01B21/082
CPCB01J27/24C01B21/0605C01B3/042C01B2203/0277C01B2203/1041B01J35/39B01J35/00B01J35/30B01J35/61Y02E60/36
Inventor 张宗弢刘文博王润伟张德广
Owner JILIN UNIV
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