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Porous g-C3N4 (graphene-carbon nitride) photocatalyst as well as preparation method and application thereof

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of application limitation, low surface area, and low photocatalytic efficiency, and achieve the effect of reducing recombination rate, large surface area, and small specific surface area

Active Publication Date: 2018-05-25
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

pure g-C 3 N 4 Photocatalysts are limited in application due to their low photocatalytic efficiency due to their low surface area and rapid photogenerated electron-hole recombination.

Method used

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  • Porous g-C3N4 (graphene-carbon nitride) photocatalyst as well as preparation method and application thereof
  • Porous g-C3N4 (graphene-carbon nitride) photocatalyst as well as preparation method and application thereof
  • Porous g-C3N4 (graphene-carbon nitride) photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Pure g-C 3 N 4 catalyst of light

[0024] (1) Preparation method

[0025] 1) Take 2.52 grams of melamine and add it to an alumina crucible, transfer it to a tube furnace, and roast it at 550°C for 4 hours under nitrogen protection (the heating rate is 5°C.min -1 ), to obtain pure g-C 3 N 4 catalyst of light.

[0026] (2) Detection

[0027] figure 1 for pure g-C 3 N 4 XRD detection of photocatalyst samples. Depend on figure 1 It can be seen that two diffraction peaks appear at 13.1 degrees and 27.4 degrees, corresponding to g-C 3 N 4 (002) and (100) crystal planes, it can be seen from the figure that the sample has good crystallinity.

[0028] figure 2 for pure g-C 3 N 4 SEM examination of photocatalyst samples. Depend on figure 2 Visible, pure g-C 3 N 4 It shows a typical block structure, and the sample does not show the existence of pores in the scanning electron microscope image.

[0029] Figure 5 for pure g-C 3 N 4 Photocatalyst s...

Embodiment 2

[0030] Example 2 Porous g-C 3 N 4 catalyst of light

[0031] (1) Preparation method

[0032] 1) Add 2.52 g (0.02 mol) of melamine solid into 120 ml of deionized aqueous solution, stir in a water bath at 80° C. for 30 min until it is uniformly dissolved. Add 48 μL (0.0004mol) of acetaldehyde solution dropwise, and stir in a water bath at 80° C. for 2 h. Transfer to an oven and dry at 80° C. for 14 hours to obtain a white intermediate product.

[0033] 2) Grind the white intermediate product, put it into an alumina crucible, transfer it to a tube furnace, and roast it at 550°C for 4 hours under nitrogen protection (heating rate is 5°C per minute, nitrogen flow rate is 40ml min -1 ), to obtain g-C with amorphous carbon nanoparticles 3 N 4 powder.

[0034] 3) will have amorphous nano-carbon particles g-C 3 N 4 The powder was ground again, put into an alumina crucible, transferred to a muffle furnace, and fired at 550°C for 2h in an air environment (the heating rate was 5°...

Embodiment 3

[0039] Embodiment 3 modified precursor g-C 3 N 4 Applications

[0040] The porous g-C prepared in embodiment 2 3 N 4 Photocatalyst Conduct photocatalyst material performance testing.

[0041] The method is as follows: use a 300W xenon lamp as the light source, adjust the photocurrent to the position of 20mA, adjust the center of the light intensity to irradiate the sample surface, fix the position, and separate the pure g-C 3 N 4 and porous g-C 3 N 4 put in 4cm 2 In the glass tank, put the glass tank containing the photocatalyst into a 224ml reactor containing an atmospheric pressure air, and finally inject 10ul isopropanol liquid into the reactor, after 20min of light, draw the second needle, every 20 minutes Withdraw a needle, test, and record the peak area of ​​isopropanol.

[0042] The result is as Image 6 As shown, after 20min of light, pure g-C 3 N 4 Catalyst degradation was 2109ppm, while the porous g-C 3 N 4 The catalyst degradation amount is 8854ppm, re...

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Abstract

The invention discloses a porous g-C3N4 (graphene-carbon nitride) photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of using melamine and acetaldehyde as raw materials, using acetaldehyde to modify a precursor of the melamine, and roasting for two times under different environments, so as to obtain the g-C3N4 photocatalyst.The prepared g-C3N4 photocatalyst has the advantages that the surface area is large, and the porosity is high; by adopting the porous structure, the energy conversion efficiency is improved, the specific surface area of a semiconductor is increased, more surface active sites are provided, and the photocatalysis activity is improved; moreover, by adopting the nanometer pore wall structure, the transmission distance between photo-induced electron cavities is reduced, the separating efficiency of photo-induced electrons and cavities is improved, the compounding rate is reduced, and the photocatalysis activity under the visible light is greatly improved. The preparation method has the advantages that the cost is low, and the operation is convenient; the harmful matters of isopropanol and the like can be degraded under the condition of radiation by the visible light, and the important practical application value is realized in the fields of environment purification and production of clean energy.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to the preparation of porous g-C by modifying precursors 3 N 4 Methods and applications of photocatalysts. Background technique [0002] Photocatalytic technology can effectively solve energy and environmental problems, and has received increasing attention. Photocatalytic materials can use sunlight to hydrolyze hydrogen, decompose harmful substances, and solve energy and environmental problems faced by human development. At present, photocatalysts produced by light irradiation have a high recombination rate of electron-hole pairs, low photon utilization efficiency, and low photocatalytic activity. Therefore, it is necessary to study the modification of semiconductor photocatalysts. The purpose and function of modification include improving excitation charge separation and inhibiting carrier recombination to improve quantum efficiency. [0003] An or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C07C45/00C07C45/29C07C49/08C01B21/082
CPCC01B21/0605C07C45/00C07C45/29B01J27/24B01J35/633B01J35/39C07C49/08Y02P20/10
Inventor 范晓星王洪亮韩东远刘晶孔令茹王绩伟韩宇
Owner LIAONING UNIVERSITY
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