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Preparation method and application of porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material

A catalytic material, carbon nitride technology, applied in the direction of graphene, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low process yield, pollution cost, high cost, etc., and achieve low cost and high process efficiency. The effect of mild conditions and strong interfacial contact

Active Publication Date: 2020-02-11
XIANGTAN UNIV
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  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low yield, long process, serious pollution or high cost of existing semiconductor materials used for actual photocatalytic hydrogen production, the present invention proposes a porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure Preparation method and application of photocatalytic materials

Method used

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  • Preparation method and application of porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material
  • Preparation method and application of porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material
  • Preparation method and application of porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material

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Embodiment 1

[0026] A method for preparing a porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material, comprising the following steps:

[0027] (1) Synthesis of GO

[0028] GO nanosheets were synthesized by a modified Hummer method using natural graphite powder. First, 1.25 g NaNO 3 and 2.5g of graphite powder were gradually dispersed in concentrated H 2 SO 4 (60mL) solution. The temperature of the mixture was kept at 0 °C, and 7.5 g of KMnO was added 4 Dissolved gradually, and the mixture was stirred at 30 °C for 6 h to allow oxidation. Next, the mixture was diluted with 230 mL of deionized water and stirred at 90 °C for 20 min. By adding 6mL H 2 o 2 Terminate the reaction to reduce residual KMnO 4 , and a bright yellow mixture was obtained after the reduction reaction. The mixture was washed with deionized water, and then solid GO nanosheets were isolated by freeze-drying.

[0029] (2) Synthesis of porous two-dimensional carbon n...

Embodiment 2 to 5

[0031] The amount of GO in step (2) was replaced by 0.005, 0.007, 0.013 and 0.016 g GO, respectively, to obtain the corresponding products.

[0032] Taking the product obtained in Example 1 as an example, the characterization results are as follows:

[0033] Depend on figure 1 and figure 2 It can be seen that the GOCN prepared in Example 1 is indeed a porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure.

[0034] image 3 It is shown that GOCN is indeed a porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure, and the thickness of the outer carbon nitride layer in GOCN is about 0.5 nm, which is close to the monolayer thickness of CN. In addition, the thickness of the entire GOCN sample is about 1.6 nm, which can be concluded as an ultrathin structure.

[0035] The GOCN photocatalytic material and CN obtained in Example 1 of the present invention were used for the photocatalytic hydrogen production activity test. From ...

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Abstract

The invention discloses a preparation method and application of a porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material. The preparation method comprises the steps that firstly, GO nanosheets are synthesized by adopting an improved Hummer method, then melamine is used as a nitrogen source, a simple local in-situ thermal oxygen erosion strategy isadopted, and the porous two-dimensional carbon nitride@ graphene@carbon nitride sandwich structure photocatalytic material can be prepared. According to the preparation method and application of the porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material, only a low-cost and environmentally friendly solvent and a controlled heating process need to be used, and toxic reagents and cumbersome post-treatment processes are not needed to be used; and compared with pure CN, an optimized GOCN composite material shows significantly improved photocatalytic hydrogen production activity, and the hydrogen production rate can reach up to 12.48 mmolg<-1>h<-1>, and is 32.0 times higher than CN under the same conditions.

Description

technical field [0001] The invention relates to a semiconductor photocatalytic material, in particular to a preparation method and application of a porous two-dimensional carbon nitride@graphene@carbon nitride sandwich structure photocatalytic material. Background technique [0002] With the advancement of science and technology, the whole society has undergone the first industrial revolution, then the second industrial revolution, the third industrial revolution, and now the fourth industrial revolution. In just over two hundred years, the whole society has Great progress has been made. Especially in the age of information and intelligence, society's demand for energy is increasing. Energy drives the progress of the whole society and plays a key role in making the whole society run continuously. However, fossil fuels make up a disproportionately large portion of the energy architecture. This leads to the environmental problems and energy crises that are common today. Hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04C01B32/198C01B32/184
CPCB01J27/24C01B3/042C01B32/198C01B32/184B01J35/39Y02E60/36
Inventor 宋亭
Owner XIANGTAN UNIV
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