Preparation of porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets

A technology of graphite phase carbon nitride and graphene nanosheets, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low utilization rate of visible light and avoid thermal stripping and solvent Exfoliation, good photoelectrochemical performance, and stable structure

Active Publication Date: 2019-08-02
SOUTHEAST UNIV
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Problems solved by technology

However, the bandgap of graphitic carbon carbide / graphene is still wide, resulting in low utilization of visible light

Method used

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  • Preparation of porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets
  • Preparation of porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets
  • Preparation of porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets

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example 1

[0025] 2.5g melamine and 2.55g cyanuric acid were dissolved in 100mL and 50mL dimethyl sulfoxide respectively, after ultrasonic treatment to complete dissolution, it was mixed and stirred for 10 minutes to obtain a white precipitate. Subsequently, the mixture was centrifuged at 3000 rpm for 5 minutes to remove the solvent, and washed several times with ethanol. The resulting white powder was dried at 60°C overnight and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 5°C per minute. Curly light brown graphene carbon nitride nanosheets were obtained. Its microscopic appearance is as figure 2 b, with curled nanosheet structure, image 3 The nitrogen adsorption curves show that the prepared nanosheet structure has a high specific surface area and porous structure, and the photoelectrochemical and photocatalytic properties are as follows: Figure 5 , Image 6 It is shown that the porous nanosheets can improve the photoelectrochemical performance of the m...

example 2

[0027] Graphite carbon nitride / reduced graphene oxide composites were obtained by solvothermally combining porous graphitic carbon nitride nanosheets and graphene oxide. Add 200 mg of graphitic carbon nitride to 50 mL of dimethyl sulfoxide. Then, a certain amount of graphene oxide (such as 1.25%, 2.5%, 5%) obtained by the improved Hummers method was added to the graphite phase carbon nitride nanosheet solution, and ultrasonically dispersed for 1 hour. The mixed solution was then transferred to a Teflon-lined stainless steel autoclave (100 mL) and heated at 180°C for 12 hours. After cooling to room temperature, it was filtered and the prepared complex was dried at 60°C overnight. Figure 4 XPS curve of porous sulfur-doped graphite phase carbon nitride / reduced graphene oxide nanosheets, Figure 4 (d) The characteristic peak of sulfur appears, indicating that sulfur can be doped in graphene carbon nitride by DMSO solvothermal. combine Figure 5 Photoelectrochemical performance ...

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Abstract

The invention provides preparation of porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets. The porous sulfur-doped graphite phase carbon nitride-reduced graphene oxidenanosheets are synthesized by combining supermolecular self-assembly with solvent thermal treatment under the condition of no other modifiers. The preparation mainly comprises the following process steps: 1, preparing a supermolecular precursor by hydrogen bond self-assembly; 2, roasting the precursor under a certain reaction condition to prepare stable and uniform graphite phase carbon nitride nanosheets; 3, performing solvent thermal treatment on dimethyl sulfoxide serving as a sulfur source and a solvent, graphene oxide and carbon nitride to prepare the porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets. The porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets are prepared by optimizing experiment conditions; the samples are stable in structure and high in photoelectrochemical property, and have wide application prospect in photocatalytic hydrogen production, carbon dioxide reduction and photocatalytic degradation of pollutants.

Description

technical field [0001] The invention relates to a method for preparing composite materials of graphite phase carbon nitride and reduced graphene oxide, and belongs to the technical field of material chemical preparation. Background technique [0002] Graphite-phase carbon carbide has attracted worldwide attention as an inorganic and visible light-responsive photocatalyst. Due to its remarkable thermochemical stability, facile synthetic route, and moderate band gap (∼2.7 eV), graphitic carbon carbide has great potential applications, such as hydrogen or oxygen production, catalytic degradation of pollutants, CO 2 restore etc. However, the disadvantages of bulk graphitic carbon carbide, such as low specific surface area, rapid recombination of photogenerated electron-hole pairs, and low utilization of light energy, limit its application to a certain extent. Two-dimensional ultrathin graphitic carbon carbide nanosheets with porous structures are considered to be the most prom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08
CPCB01J27/24B01J35/0033B01J35/004B01J35/10B01J37/08
Inventor 郭新立郑燕梅陈忠涛刘园园张伟杰唐璇王艺璇彭正彬张铭李锐
Owner SOUTHEAST UNIV
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