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Ammoniated ultrathin graphite-phase carbonitride photocatalyst and preparation method thereof

A graphite phase carbon nitride, phase carbon nitride light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve unfavorable carbon dioxide adsorption and reduction, reduced catalytic performance, difficult to obtain effect and other problems, to achieve the effect of low production cost, no equipment, and excellent photocatalytic performance.

Active Publication Date: 2017-04-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong π–π* interaction between carbon nitride layers, general physical methods are difficult to achieve good results, such as ultrasonic method
However, chemical thinning methods (such as concentrated acid treatment) will destroy the abundant amino groups on the surface of carbon nitride, which is not conducive to the adsorption and reduction of carbon dioxide, and even reduces the catalytic performance.

Method used

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  • Ammoniated ultrathin graphite-phase carbonitride photocatalyst and preparation method thereof
  • Ammoniated ultrathin graphite-phase carbonitride photocatalyst and preparation method thereof
  • Ammoniated ultrathin graphite-phase carbonitride photocatalyst and preparation method thereof

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Embodiment 1

[0037] 1) Precursor treatment: Dissolve melamine solid in anhydrous ethanol solution to form a clear solution, then add 0.5M nitric acid solution dropwise, a white precipitate is formed, then filter the white precipitate and vacuum dry it for later use;

[0038] 2) Preparation of bulk graphitic carbon nitride (g-C 3 N 4 ) Photocatalyst material: move the white precipitate obtained in step 1) into a crucible, then place the crucible in a muffle furnace to raise the temperature to 550°C at a heating rate of 20°C / min, keep it warm for 3h, and obtain a light yellow color after cooling solid;

[0039] 3) Preparation of graphitic carbon nitride (g-C 3 N 4 ) photocatalyst material superfine powder: the pale yellow bulk graphite phase carbon nitride (g-C) gained in step 2) 3 N 4 ) is placed in a beaker, and a certain amount of alcohol is added under stirring conditions to form an emulsion with a concentration of 1 g / ml, and then the emulsion is placed in a ball mill for ball mill...

Embodiment 2

[0069] In Example 2, the concentration of nitric acid to treat the precursor was changed. When 0.1M nitric acid was used to treat the melamine precursor, a white flocculent precipitate was obtained. This type of precipitate has poor crystallization performance, and the carbon nitride powder obtained after calcination has There are too many components of polymerization, which is not good for further thinning.

Embodiment 3

[0081] 1) Precursor treatment: Dissolve melamine solid in anhydrous ethanol solution to form a clear solution, then add 0.5M nitric acid solution dropwise, a white precipitate is formed, then filter the white precipitate and vacuum dry it for later use;

[0082] 2) Preparation of bulk graphitic carbon nitride (g-C 3 N 4 ) Photocatalyst material: move the white precipitate obtained in step 1) into a crucible, then place the crucible in a muffle furnace to raise the temperature to 530°C at a heating rate of 20°C / min, keep it warm for 4h, and obtain a light yellow color after cooling solid;

[0083] 3) Preparation of graphitic carbon nitride (g-C 3 N 4 ) photocatalyst material superfine powder: the pale yellow bulk graphite phase carbon nitride (g-C) gained in step 2) 3 N 4 ) is placed in a beaker, and a certain amount of alcohol is added under stirring conditions to form an emulsion with a concentration of 1.5 g / ml, and then the emulsion is placed in a ball mill for ball mi...

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Abstract

The invention discloses an ammoniated ultrathin graphite-phase carbonitride photocatalyst material and a preparation method thereof. The ammoniated ultrathin graphite-phase carbonitride photocatalyst material resembles wrinkled tulle, is in the shape of tulle with wrinkles and has a uniform thickness of 3 to 5 nm; and the surface of the material is smooth and contains rich amino groups. The preparation method comprises the following steps: acidifying melamine so as to obtain a protonated melamine supermolecular structure crystal, carrying out calcining in an inert protective atmosphere so as to prepare a graphite-phase carbonitride material and carrying out uniformization so as to obtain ultrafine powder of a graphite-phase carbonitride photocatalyst material; and placing the ultrafine powder of the graphite-phase carbonitride photocatalyst material and an ammonia-source substance capable of producing ammonia gas through thermal decomposition into a tubular furnace, introducing inert gas for deoxygenation and then carrying out gradient calcining in the inert protective atmosphere, i.e., carrying out heating to 500 to 540 DEG C at first, maintaining the temperature for 2 to 4 h, then carrying out heating to 560 to 600 DEG C, maintaining the temperature for 2 to 3 h and then carrying out cooling. The ammoniated ultrathin graphite-phase carbonitride photocatalyst material has substantially improved photocatalysis efficiency and present excellent photocatalysis performance when applied to catalytic reduction of CO2.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to an ammoniated ultrathin graphite phase carbon nitride (g-C 3 N 4 ) photocatalyst and its preparation method. Background technique [0002] With the massive consumption of fossil fuels, the concentration of carbon dioxide in the atmosphere has risen rapidly in the past few decades, which is considered to be one of the main causes of the greenhouse effect. The conversion of carbon dioxide into chemical fuels through artificial photoreduction systems is a very attractive approach. In recent years, the photocatalytic reduction of carbon dioxide has gradually attracted people's interest, and this method can realize the transfer and storage of energy, which makes it very promising. For the photocatalytic reduction of carbon dioxide, the use of catalyst plays a very important role in the whole reaction process. Therefore, many individual or composite photocatalysts have been developed ...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J37/08B01J35/50B01J35/39
Inventor 余家国夏鹏飞
Owner WUHAN UNIV OF TECH
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