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Preparation method of monolayer g-C3N4 nanometer material with monatomic thickness

A single-atom-thick, nanomaterial technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve unobtained problems, achieve cheap raw materials, simple preparation process, and improve photocatalytic efficiency. Effect

Inactive Publication Date: 2014-06-11
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have not obtained a true single-layer (thickness of about 0.35nm) atomically arranged carbon nitride, and they are all multi-layered or even multi-layered bulk g-C 3 N 4

Method used

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  • Preparation method of monolayer g-C3N4 nanometer material with monatomic thickness
  • Preparation method of monolayer g-C3N4 nanometer material with monatomic thickness
  • Preparation method of monolayer g-C3N4 nanometer material with monatomic thickness

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Experimental program
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Effect test

Embodiment 11

[0039] At room temperature, weigh 0.0526g g-C 3 N 4 , grind to powder in an agate mortar, sieve out the particles with a particle size greater than 0.106mm (use a 140 mesh sieve), and add 30ml of HNO with a mass concentration of 65% 3 After being stirred evenly, it was left to stand for 24 hours. After being stirred evenly again, it was sonicated for 3 hours at intervals on an ultrasonic instrument with a frequency of 40,000 Hz in a 65°C water bath using a centrifuge tube, and washed with water until the pH was 6. After drying and grinding into powder, add 50ml of absolute ethanol, stir evenly, and ultrasonicate for 3 hours at intervals. Centrifuge and wash with absolute ethanol, dry and grind at 80°C to obtain a single layer of g-C 3 N 4 . The monolayer g-C 3 N 4 The interatomic distance of the material is about 0.35nm, and the electron diffraction at any position will show a six-membered ring structure, and the thickness is about 0.334nm, and the size is about 500nm-1u...

Embodiment 12

[0041] At room temperature, weigh 0.0507g g-C 3 N 4 , grind to powder in an agate mortar, sieve out the particles with a particle size greater than 0.106mm (use a 140 mesh sieve), add 30ml of HNO with a mass concentration of 50% 3 After stirring evenly, let it stand for 24 hours. After stirring again, conduct ultrasonic treatment at intervals of 3 hours on an ultrasonic instrument with a frequency of 40,000 Hz in a 60°C water bath, wash with water until the pH is 6, dry and grind it into powder, and then add 50ml of absolute ethanol and stir. Uniform, interval sonication for 3h. Centrifuge and wash with absolute ethanol, dry and grind at 80°C to obtain a single layer of g-C 3 N 4 . This monolayer g-C 3 N 4 The distance between atoms is about 0.35nm, the thickness is 0.334nm, and the size is about 450nm-1um. The TEM image of the material is shown in Figure 5 shown.

Embodiment 13

[0043] At room temperature, weigh 0.0571g g-C 3 N 4 , grind to powder in an agate mortar, sieve out the particles with a particle size larger than 0.106mm (use a 140 mesh sieve), and add 30ml of HNO with a mass concentration of 32% 3 After being stirred evenly, it was left to stand for 24 hours. After being stirred evenly again, it was ultrasonically treated for 3 hours at intervals on an ultrasonic instrument with a frequency of 40,000 Hz in a 65°C water bath, and washed with water until the pH was 6. After drying and grinding into powder, add 50ml of absolute ethanol, stir evenly, and ultrasonicate for 3 hours at intervals. Centrifuge and wash with absolute ethanol, dry and grind at 60°C to obtain a single layer of g-C 3 N 4 . This monolayer g-C 3 N 4 The distance between atoms is about 0.35nm, and the electron diffraction at any position will show a six-membered ring structure with a thickness of about 0.334nm and a size between about 700nm and 5um. The TEM image of ...

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Abstract

The invention discloses a preparation method of a monolayer g-C3N4 nanometer material with monatomic thickness. The preparation method comprises the following steps: step 1, grinding blocky g-C3N4 into powder at room temperature, adding the powder into an acid solution or an alkali solution, uniformly stirring and standing; step 2, uniformly re-stirring the solution obtained in the step 1, performing an ultrasonic treatment, removing a supernatant liquor after precipitating completely, washing with deionized water until the pH is 6-8, drying, grinding, and adding into an organic solvent for the ultrasonic treatment again, and removing the supernatant liquor after precipitating completely; step 3, centrifugally washing the g-C3N4 obtained in the step 2 with absolute ethyl alcohol to obtain the monolayer g-C3N4. The preparation method disclosed by the invention is simple in process, good in repeatability and high in preparation speed. Under the irradiation of a xenon lamp, the photo-catalytic material has high efficiency for producing hydrogen by virtue of decomposition of water and has an obvious effect on degradation of an organic dye. The preparation method disclosed by the invention has the advantages of providing a new idea for preparation and application of a g-C3N4 photo-catalytic material and widening the research range of the photo-catalytic material.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterials and relates to a single-layer g-C 3 N 4 Preparation of two-dimensional photocatalytic nanolayered materials, especially a single-atom-thick monolayer g-C 3 N 4 Preparation method of photocatalyst. Background technique [0002] g-C 3 N 4 (Graphene Carbon Nitride, g-C 3 N 4 ) is a block-shaped g-C formed by stacking a single-layer sheet structure composed of carbon and nitrogen atoms. 3 N 4 Materials, due to their excellent electronic, mechanical and optical properties, have aroused a research boom at home and abroad. Especially in the field of photocatalysis, g-C 3 N 4 It has the same high specific surface area and extremely fast electron transport speed as graphene, which can improve the catalytic efficiency of photocatalytic materials. Since the monoatomic layer of g-C 3 N 4 It has a larger specific surface area than multilayer carbon nitride, better photocatalyt...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y30/00B01J27/24
Inventor 樊君马永宁刘恩周胡晓云李兴华代宏哲武慧童樊骁李银叶
Owner NORTHWEST UNIV
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