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High visible light activated graphite-phase carbon nitride nanosheet and preparation method thereof

A graphitic carbon nitride, visible light technology, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve problems such as high energy consumption, affecting carbon nitride polymerization, and time-consuming, and achieve strong visible light absorption performance. , the effect of superior photocatalytic performance and broad application prospects

Active Publication Date: 2018-11-09
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Description
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Problems solved by technology

However, the template method usually has the problem of cumbersome post-template removal or additional additives that will affect the polymerization of carbon nitride.
At the same time, the "top-down" method has high energy consumption, long time consumption, extremely low yield, the introduction of additional organic solvents or strong acid impurities, and the serious blue shift of the absorption band edge of the prepared carbon nitride nanosheets (less than 450nm )And other issues

Method used

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  • High visible light activated graphite-phase carbon nitride nanosheet and preparation method thereof
  • High visible light activated graphite-phase carbon nitride nanosheet and preparation method thereof
  • High visible light activated graphite-phase carbon nitride nanosheet and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: A kind of graphitic phase carbon nitride is prepared by the following method:

[0039] Take 12g of dicyandiamide in a 50mL corundum crucible, cover it, put it in a muffle furnace, and put it in a static air atmosphere at 5°C min -1 The temperature was raised to 550°C, and thermal polymerization was carried out at this temperature for 4 hours. After it was cooled to room temperature, the resulting yellow catalyst was taken out and ground into powder, and the obtained sample was marked as S1 sample.

[0040] Such as figure 1 As shown in line a in the middle, the results of the powder X-ray diffraction spectrum show that sample S1 has two characteristic diffraction peaks at 13.1° and 27.4°, corresponding to (100) and (002) characteristic peaks of graphite phase carbon nitride respectively, and reported in the literature The results are consistent with (Adv. Mater. 2014, 26, 8046–8052), indicating that S1 is a graphitic carbon nitride. The Fourier transform...

Embodiment 2

[0042] Embodiment 2: A kind of graphite phase carbon nitride nanosheet with high visible light activity is prepared by the following method:

[0043] Take 1.5g of dicyandiamide and 64mL of water in a 100mL hydrothermal reaction kettle for hydrothermal reaction. After sealing, transfer it to an oven to heat up to 200°C and keep it warm for 1h. After it cools down to room temperature, collect the mixed solution in the kettle. , followed by rotary evaporation to remove water therein to obtain a solid intermediate product.

[0044] Take 12g of the solid intermediate product in a 50mL corundum crucible, cover it, place it in a muffle furnace, and heat it at 5°C min under a static air atmosphere. -1 The temperature was raised to 550°C, and thermal polymerization was carried out at this temperature for 4 hours. After it was cooled to room temperature, the resulting yellow catalyst was taken out and ground into powder, and the obtained sample was marked as S2 sample.

[0045] Such a...

Embodiment 3

[0047] Embodiment 3: A kind of graphite phase carbon nitride nanosheet with high visible light activity is prepared by the following method:

[0048] To examine the effect of hydrothermal pretreatment time on the morphology and photocatalytic performance of the obtained carbon nitride catalysts, we performed hydrothermal time-controlled experiments. Except that the hydrothermal time was adjusted to 4h, other reaction conditions and operations were exactly the same as in Example 2, and the obtained sample was marked as S3 sample.

[0049] Such as figure 1 As shown in line c in the middle, the results of the powder X-ray diffraction spectrum show that the sample S3 is graphite phase carbon nitride, but the diffraction peak intensity of S3 at 27.4° is obviously weakened, suggesting that the carbon nitride is stripped. The Fourier transform infrared spectrum of sample S3 as figure 2 As shown in line c in the figure, the peak marked by the dotted line in the figure is the same a...

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Abstract

The invention belongs to the technical field of preparation of novel materials, and particularly discloses a high visible light activated graphite-phase carbon nitride nanosheet as well as a preparation method thereof and application to hydrogen generation by virtue of visible light catalytic decomposition of water. The preparation method of the graphite-phase carbon nitride nanosheet adopts ordinary nitrogen-rich material cyanoguanidine as a raw material, the raw material has the hydrothermal reaction by virtue of calcinations to obtain a midbody, and the midbody is directly used for preparing the graphite-phase carbon nitride nanosheet. Compared with the method for producing the graphite-phase carbon nitride by directly calcining the cyanoguanidine, the obtained product is the carbon nitride nanosheet. Compared with the preparation method of the carbon nitride nanosheet in the prior art, the preparation method of the carbon nitride nanosheet adopted in the invention has the characteristics of environmental friendliness, economical performance and high efficiency; and the method can greatly inhibit the blue shift of a light absorption band edge of the carbon nitride nanosheet, sothat the photocatlytic hydrogen production performance of the obtained catalyst can be significantly improved. The preparation method provided by the invention is simple in process, single and easy inobtaining the raw materials, easy in mass industrialized production and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, in particular to a graphite-phase carbon nitride nanosheet with high visible light activity, a preparation method thereof, and an application in visible light catalytic decomposition of water to produce hydrogen. Background technique [0002] Graphite carbon nitride with graphite-like lamellar structure has been widely used in photocatalytic water splitting for hydrogen production in recent years (J.Am .Chem.Soc.,2009,131,1680–1681), dye wastewater treatment (J.Am.Chem.Soc.,2013,135,7118-7121), POPs treatment (Environ.Sci.Technol.,2016,50 ,12938-12948), and biological imaging (J.Am.Chem.Soc.,2013,135,18-21) and other fields have been extensively studied. [0003] Combined with literature reports, conventional methods, that is, by directly calcining nitrogen-rich raw materials such as melamine and dicyandiamide, etc., the obtained carbon nitride is a bulk phase aggregate, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02B82Y30/00C01B3/04C01B21/06B01J35/00
CPCB82Y30/00C01B3/042C01B21/0605B01J27/24C01B2203/0277C01B2203/1041B01J35/40Y02E60/36
Inventor 吕康乐程金水方顺伍晓锋李玫李覃丁耀彬杨昌军唐和清
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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