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Preparation method of rodlike porous graphite-phase carbon nitride photocatalytic material

A technology based on carbon nitride light and porous graphite, which is applied in the field of photocatalysis, can solve problems such as the need to improve absorption in the visible light region, shorten the migration distance of electrons and holes, and reduce the lifetime of carriers, so as to achieve good application prospects and improve photocatalysis. Catalytic performance, effect of reducing recombination rate

Inactive Publication Date: 2018-12-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But currently g-C 3 N 4 There are still many problems and challenges in the field of photocatalysis, and the material itself has some shortcomings: 1. The specific surface area is small, and it is easy to form blocks during the synthesis process, and its band gap is about 8m 2 / g
2. Photogenerated electron-hole pairs in g-C 3 N 4 It is very easy to recombine during the transport process in the body and on the surface, which reduces the life of the carriers and reduces the photocatalytic performance
3. g-C 3 N 4 Affected by its own band gap, the absorption in the visible region needs to be improved
The rod-like structure also reduces the scale in two directions, shortens the migration distance of electrons and holes, and reduces their recombination rate. At present, there are two main methods for synthesizing rod-like structures, namely, the bottom-up space-confined synthesis method and the automatic synthesis method. The top-down crushing method, in the alumina channel, cyanamide can generate nanorod-like g-C due to space constraints 3 N 4 ; prolonged reflux in methanol, g-C 3 N 4 The defect is broken and curled to form nanorods, but these two methods are cumbersome and complicated. The present invention designs a simple, environmentally friendly and low-cost method to obtain a porous structure by calcining the intermediate, rod-shaped melem Rod g-C 3 N 4 , which further enhanced the photocatalytic performance of the material

Method used

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  • Preparation method of rodlike porous graphite-phase carbon nitride photocatalytic material
  • Preparation method of rodlike porous graphite-phase carbon nitride photocatalytic material
  • Preparation method of rodlike porous graphite-phase carbon nitride photocatalytic material

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Effect test

Embodiment 1

[0022] Put 30 grams of melamine into a 50ml crucible with a lid and transfer it to a box furnace, heat it to 430°C at a rate of 5°C / min in a static air atmosphere, keep it warm for 4h, and put the powder cooled with the furnace For further grinding, put 1 g of the ground powder into a beaker and add 30 ml of deionized water. After ultrasonication for 15 minutes, the sample was washed with deionized water several times, and finally washed with ethanol, centrifuged at 4000 rpm for 15 minutes, and the obtained sample was dried overnight and dried. Grind to obtain the intermediate rod-shaped melem, then put 1g of the intermediate into a crucible with a lid and transfer it to a box furnace, heat it to 550°C at a heating rate of 5°C / min in an air atmosphere, and keep it warm 4h, and cooled with the furnace, the resulting product was collected.

Embodiment 2

[0024] Put 30 grams of melamine into a 50ml crucible with a lid and then transfer it to a box furnace, heat it to 430°C at a rate of 5°C / min in an Ar gas atmosphere, keep it warm for 4h, and further cool the powder with the furnace Grinding, put 1g of ground powder into a beaker and add 30ml of deionized water, after ultrasonication for 15min, wash the sample with deionized water several times, finally wash with ethanol, centrifuge at 4000rpm for 15min, dry the obtained sample overnight, that is The intermediate rod-shaped melem was obtained, and then 1 g of the intermediate was put into a crucible with a lid and then transferred to a box furnace, heated to 550 °C at a heating rate of 5 °C / min in an Ar gas atmosphere, and kept for 4 hours. And with furnace cooling, the resulting product was collected.

Embodiment 3

[0026] Put 30 grams of melamine into a 50ml crucible with a lid and transfer it to a box furnace, heat it to 430°C at a rate of 5°C / min in a static air atmosphere, keep it warm for 4h, and put the powder cooled with the furnace For further grinding, put 1g of the ground powder into a beaker and add 30ml of deionized water. After ultrasonication for 30min, the sample was washed with deionized water several times, and finally washed with ethanol, centrifuged at 4000rpm for 15min, and the obtained sample was dried overnight. That is, the intermediate rod-shaped melem was obtained, and then 1 g of the intermediate was put into a crucible with a lid and then transferred to a box furnace, heated to 550°C at a heating rate of 5°C / min in an air atmosphere, and kept for 4 hours. And with furnace cooling, the resulting product was collected.

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Abstract

The invention relates to a preparation method of a rodlike porous graphite-phase carbon nitride photocatalytic material. The preparation method comprises the following steps: taking melamine as a precursor, putting a certain amount of the melamine into a crucible with a cover and carrying out calcining at a temperature of 400-450 DEG C under an atmosphere of argon or air to obtain an intermediatemelem with a macroscopic morphology of light yellow powder, then further grinding the powder, washing the ground light yellow powder, carrying out drying, heating the dried powder to 450-600 DEG C ata heating speed of 1-30 DEG C / min under an atmosphere of argon or air, and carrying out heat preservation for 2-4 hours to obtain a final product.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a method for preparing rod-shaped graphite phase carbon nitride with a porous structure. Background technique [0002] The use of photocatalytic technology to convert solar energy into energy that can be directly used by humans is the main method to solve the energy crisis and environmental pollution problems in today's society, and the unique structure of graphitic carbon nitride endows it with good photocatalytic performance, making it a photocatalytic A research hotspot in the field of catalysis, which has the following advantages: 1. Low production cost, g-C with different shapes can be obtained by directly calcining melamine, urea, dicyandiamide and other materials 3 N 4 , 2. Has good physical and chemical properties, does not react with substances such as acids and bases, and has good thermal stability. 3. The position of valence band and conduction band is suitable,...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02B01J35/10
CPCB01J27/24B01J35/00B01J35/30B01J35/60B01J35/39
Inventor 何芳王行赵乃勤师春生何春年刘恩佐马丽颖沙军威
Owner TIANJIN UNIV
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