Ultrathin carbon nitride nanosheet rich in nitrogen defects, preparation method of ultrathin carbon nitride nanosheet and method for preparing hydrogen peroxide through photocatalysis

A technology of hydrogen peroxide and carbon nitride, which is applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology, etc., can solve the problems of low photocatalytic efficiency of carbon nitride, and achieve strong environmental tolerance and easy Good operation and stability

Pending Publication Date: 2021-12-24
UNIV OF SCI & TECH OF CHINA
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  • Claims
  • Application Information

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However, there are still obvious deficiencies in carbon nitride, and its own in

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  • Ultrathin carbon nitride nanosheet rich in nitrogen defects, preparation method of ultrathin carbon nitride nanosheet and method for preparing hydrogen peroxide through photocatalysis
  • Ultrathin carbon nitride nanosheet rich in nitrogen defects, preparation method of ultrathin carbon nitride nanosheet and method for preparing hydrogen peroxide through photocatalysis
  • Ultrathin carbon nitride nanosheet rich in nitrogen defects, preparation method of ultrathin carbon nitride nanosheet and method for preparing hydrogen peroxide through photocatalysis

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preparation example Construction

[0080] The invention provides a method for preparing ultrathin nitrogen-deficient carbon nitride nanosheets, comprising the following steps:

[0081] 1) After melamine is calcined for the first time, bulk phase carbon nitride is obtained;

[0082] 2) after the bulk phase carbon nitride obtained by the above steps is subjected to thermal stripping through second calcination, obtain carbon nitride ultrathin nanosheets;

[0083] 3) In a nitrogen atmosphere, the carbon nitride ultrathin nanosheets obtained in the above steps are calcined for the third time to obtain nitrogen-deficient carbon nitride nanosheets.

[0084] In the present invention, the melamine is calcined for the first time to obtain bulk carbon nitride.

[0085] In the present invention, the heating rate of the first calcination is preferably 2-10°C / min, more preferably 3-9°C / min, more preferably 4-8°C / min, more preferably 5-7°C / min.

[0086] In the present invention, the temperature of the first calcination is...

Embodiment 1

[0123] (1) Preparation of bulk carbon nitride

[0124] Weigh 5g of melamine, put it into a 30mL crucible after grinding, cover it, and place it in a muffle furnace. Raise the temperature to 550°C at a rate of 2.5°C / min, keep it for 4 hours, then naturally cool to room temperature, and grind thoroughly to obtain light yellow bulk carbon nitride powder.

[0125] (2) Preparation of carbon nitride nanosheets

[0126] Spread the bulk carbon nitride powder evenly on the bottom of the open crucible, place it in a muffle furnace, raise the temperature to 520 °C at a rate of 2.5 °C / min, keep it for 4 hours, and then cool it naturally to room temperature to obtain white nitrogen carbonized ultrathin nanosheets.

[0127] (3) Preparation of nitrogen-deficient carbon nitride nanosheets

[0128] Place the white carbon nitride ultra-thin nanosheets in an open porcelain boat and put them into a tube furnace. During the whole process, nitrogen gas is introduced at a rate of 100 mL / min, and ...

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Abstract

The invention provides an ultrathin nitrogen-defect carbon nitride nanosheet. The nitrogen-defect carbon nitride nanosheet is amorphous carbon nitride with a two-dimensional conjugated structure, and the thickness of the nitrogen-defect carbon nitride nanosheet is 0.51-1.56 nm. The nitrogen-defect carbon nitride nanosheet disclosed by the invention has a relatively large specific surface area and an ultrathin sheet structure, and meanwhile, the nitrogen defect concentration is controllable. As a photocatalyst, the carbon nitride nanosheet rich in nitrogen defects has the characteristics of high photocatalytic activity, strong environmental tolerance, good stability and the like. The nitrogen-defect carbon nitride nanosheet can be obtained by calcining bulk-phase carbon nitride for multiple times in different atmospheres, the concentration of nitrogen defects can be regulated, and the preparation method is simple, low in cost, easy to operate and easy to expand and amplify. The prepared nitrogen-defect carbon nitride nanosheet can be used as a photocatalyst for on-site preparation of hydrogen peroxide, and is also suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to the technical field of graphitic carbon nitride photocatalysts, and relates to an ultra-thin nitrogen-deficient carbon nitride nanosheet and a preparation method thereof, and a method for preparing hydrogen peroxide by photocatalysis, and in particular to an ultra-thin nitrogen-deficient carbon nitride nanosheet. Thin carbon nitride nanosheets and a preparation method thereof, and a photocatalytic method for preparing hydrogen peroxide. Background technique [0002] As a recognized cleaning oxidant, hydrogen peroxide is widely used in organic synthesis, wastewater treatment, medical disinfection, pulp bleaching and other fields. In addition, compared with hydrogen, liquid hydrogen peroxide has higher energy density and is easier to store and transport, so it is also a promising clean fuel. At present, the industry generally adopts the anthraquinone method to prepare hydrogen peroxide, which has problems such as high energy con...

Claims

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Application Information

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IPC IPC(8): C01B21/06B01J27/24B01J35/10C01B15/029B82Y40/00
CPCC01B21/0605B82Y40/00B01J27/24B01J35/1042B01J35/1061B01J35/1019C01B15/029C01P2004/24C01P2006/12C01P2002/72
Inventor 俞汉青陈飞刘练练陈洁洁
Owner UNIV OF SCI & TECH OF CHINA
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