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Ultrathin porous N doped g-C3N4 photocatalyst and preparation method thereof

A photocatalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high recombination probability of photogenerated electron-hole pairs, low quantum efficiency of hydrogen production, and constraints Problems such as the process of industrialization, to achieve the effects of NO gas degradation and pollutant degradation performance improvement, low raw material cost, and improvement of reduction performance and oxidation performance

Inactive Publication Date: 2017-12-15
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, g-C 3 N 4 The narrow range of light absorption, the high recombination probability of photogenerated electron-hole pairs, and the low quantum efficiency of hydrogen production seriously restrict its industrialization process.

Method used

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  • Ultrathin porous N doped g-C3N4 photocatalyst and preparation method thereof
  • Ultrathin porous N doped g-C3N4 photocatalyst and preparation method thereof
  • Ultrathin porous N doped g-C3N4 photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment one: carry out according to the following steps:

[0020]In the first step, urea and melamine were added to 50ml of distilled water in a molar ratio of 1:1, placed on a constant temperature magnetic stirrer and stirred for 30min, and then the solution was transferred to a 100mL polytetrafluoroethylene-lined hydrothermal kettle. Then put the hydrothermal kettle into the oven at 180 degrees and keep warm for 24h;

[0021] In the second step, after the hydrothermal kettle is naturally cooled to room temperature, the white matter in the kettle is washed with distilled water for 3 to 5 times, and then dried in an oven (60 degrees for 10 hours). Grind the dried white substance and put it into a corundum crucible, then put the crucible into a muffle furnace for calcination at 520°C for 4h, with a heating rate of 3°C / min.

Embodiment 2

[0022] Embodiment two: carry out according to the following steps:

[0023] In the first step, urea and melamine were added to 50ml of distilled water in a molar ratio of 3:1, placed on a constant temperature magnetic stirrer and stirred for 30min, and then the solution was transferred to a 100mL polytetrafluoroethylene-lined hydrothermal kettle. Then put the hydrothermal kettle into the oven at 180 degrees and keep warm for 20h;

[0024] In the second step, after the hydrothermal kettle is naturally cooled to room temperature, the white matter in the kettle is washed with distilled water for 3 to 5 times, and then dried in an oven (60 degrees for 10 hours). Grind the dried white substance and put it into a corundum crucible, then put the crucible into a muffle furnace for calcination at 520°C for 3h, with a heating rate of 3°C / min.

Embodiment 3

[0025] Embodiment three: carry out according to the following steps:

[0026] In the first step, urea and melamine were added to 50ml of distilled water in a molar ratio of 6:1, placed on a constant temperature magnetic stirrer and stirred for 30min, and then the solution was transferred to a 100mL polytetrafluoroethylene-lined hydrothermal kettle. Then put the hydrothermal kettle into an oven at 200 degrees and keep warm for 16h;

[0027] In the second step, after the hydrothermal kettle is naturally cooled to room temperature, the white matter in the kettle is washed with distilled water for 3 to 5 times, and then dried in an oven (60 degrees for 10 hours). The dried white substance was ground and put into a corundum crucible, and then the crucible was put into a muffle furnace for calcination at 500°C for 3h, and the heating rate was 3°C / min.

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Abstract

The invention relates to a preparation method of ultrathin porous N doped g-C3N4 photocatalyst, and an experiment employs hydro-thermal pretreatment and calcination for preparation. The method concretely comprises the following steps: (1) urea and melamine are added into 50ml of distilled water according to a mol ratio 3:1, stirring is carried out on a constant temperature magnetic stirrer for 30 minutes, a solution is transferred to a 100ml hydrothermal reactor, and the reactor is placed in a baking oven at 180 DEG C and insulation is carried out for 24 hours. (2) natural cooling is carried out to a room temperature, a white substance in the reactor is washed with distilled water for 3-5 times, and drying is carried out (60 DEG C for 10 hours). The dried white substance is grinded and placed in a crucible, and the crucible is placed in a muffle furnace and calcination is carried out at 520 DEG C for 4 hours. The N doped g-C3N4 with an ultrathin porous structure has good photocatalytic hydrogen production, NO gas degradation, and pollutant degradation performance, and oxidation and reductibility are greatly improved; compared with the prior art, N / g-C3N4 with high specific surface area is obtained by using the hydrothermal pretreatment method, raw materials are cheap, the process is simple and green, and the method is suitable for industrialized production of large batch with wide application prospects.

Description

1. Technical field [0001] The invention relates to an ultra-thin porous N-doped g-C 3 N 4 Photocatalyst, specifically refers to a kind of ultrathin porous N / g-C prepared with melamine as precursor 3 N 4 Photocatalyst and its preparation method. 2. Background technology [0002] In today's society, the world is facing problems such as energy shortage and environmental pollution. Photocatalysis has become an ideal technology for environmental purification and synthesis of new energy. Its important applications mainly focus on the following aspects: [0003] (1) Treatment of liquid pollutants and water pollution: Photocatalysis has strong oxidation ability, so it can decompose and destroy many organic pollutants, such as alcohol, aldehyde, carboxylic acid, benzene and its derivatives, harmful gases and pesticides in sewage , dyes, surfactants, odorous substances, etc., so as to achieve the purpose of disinfection, decolorization, deodorization, etc., and has great applicat...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10
CPCB01J27/24B01J35/60B01J35/39
Inventor 黄洪伟田娜张以河
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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