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Preparation method and application of porous carbon-rich g-C3N4 photocatalyst

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of low photocatalytic efficiency, application limitation, low surface area, etc.

Inactive Publication Date: 2019-02-15
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure g-C3N4 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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  • Preparation method and application of porous carbon-rich g-C3N4 photocatalyst
  • Preparation method and application of porous carbon-rich g-C3N4 photocatalyst
  • Preparation method and application of porous carbon-rich g-C3N4 photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Pure g-C3N4 photocatalyst of embodiment 1

[0029] (1) Preparation method

[0030] Measure 2.52 grams of melamine into an alumina crucible, transfer it to a muffle furnace, and bake it at 550°C for 4 hours in an air atmosphere (the heating rate is 5°C.min-1) to obtain pure g-C3N4 photocatalyst.

[0031] (2) Detection

[0032] figure 1 It is the XRD detection of pure g-C3N4 photocatalyst sample. Depend on figure 1 It can be seen that two diffraction peaks appear at 13.1 degrees and 27.4 degrees, corresponding to the (002) and (100) crystal planes of g-C3N4 respectively. It can be seen from the figure that the sample has good crystallinity.

[0033] figure 2 SEM detection for pure g-C3N4 photocatalyst samples. Depend on figure 2 It can be seen that pure g-C3N4 shows a typical block structure, and the sample does not show the existence of pores in the SEM image.

[0034] image 3 It is the XPS detection of pure g-C3N4 photocatalyst sample. Depend on image 3 I...

Embodiment 2

[0036] Example 2 Porous carbon-rich g-C3N4 photocatalyst

[0037] (1) Preparation method

[0038] 1) Add 2.52 g of melamine solid and 0.1512 g of activated carbon powder into 50 ml of absolute ethanol, stir for 2 h until uniformly mixed, and then transfer to an oven for 14 h after ultrasonication for 30 min to obtain a gray intermediate product.

[0039] 2) Grind the obtained gray intermediate product, put it into an alumina crucible, transfer it to a muffle furnace, and in an air atmosphere, bake it at 550°C for 4h (heating rate of 5°C per minute) to obtain g-C3N4 powder.

[0040] 3) After grinding the g-C3N4 powder with amorphous nano-carbon particles again, it is annealed in a muffle furnace at 470 ° C for 2 h (heating rate 5 ° C per minute), and the porous carbon-rich g-C3N4 photocatalyst .

[0041] (2) Detection

[0042] Figure 4 XRD test for porous carbon-rich g-C3N4 samples. Depend on Figure 4 It can be seen that the sample has good crystallinity, as shown in t...

Embodiment 3

[0046] Example 3 Application of porous carbon-rich g-C3N4 photocatalyst (modified precursor g-C3N4)

[0047] The porous carbon-rich g-C3N4 photocatalyst prepared in Example 2 was subjected to a photocatalyst material performance test.

[0048] The method is as follows: 0.05 g of pure g-C3N4 and porous carbon-rich g-C3N4 were weighed and added to 50 ml of rhodamine B solution with a mass fraction of 10 mg / L, and stirred for 30 minutes in the dark to make them fully contact. With a 300W xenon lamp as the light source, adjust the photocurrent to 20mA, adjust the center of the light intensity to irradiate the sample surface, fix the position, mix the pure g-C3N4 rhodamine B solution and the mixed porous carbon-rich g-C3N4 rhodamine respectively Put the B solution under the light source, take 2ml of Rhodamine B every 20 minutes, and test the absorbance of the sample to prove the degradation of Rhodamine B.

[0049] The result is as Figure 8 As shown, after 20 minutes of light ir...

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Abstract

The invention discloses a preparation method and application of a porous carbon-rich g-C3N4 photocatalyst. According to the preparation method, melamine and activated carbon powder are taken as raw materials, a melamine precursor is modified by using the activated carbon powder, and the g-C3N4 photocatalyst is prepared through twice roasting in different environments. The g-C3N4 prepared with thepreparation method provided by the invention is large in surface area and high in porosity; a porous structure can effectively improve the energy conversion efficiency and increase a semiconductor specific surface area, thereby providing more surface active sites and improving the photocatalytic activity. Furthermore, a nanopore wall structure reduces the transmission distance of a photo-induced electron hole, improves the separation efficiency of the photo-induced electrons and holes, reduces the recombination rate, and greatly improves the photocatalytic activity under visible light. The method disclosed by the invention has the advantages of being low in cost and convenient to operate. By utilizing the characteristics that harmful substances such as rhodamine B and the like can be degraded by the g-C3N4 photocatalyst under visible light irradiation, the photocatalyst has important actual application value in the environment purification and cleaning energy source production.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a method and application for preparing a porous carbon-rich g-C3N4 photocatalyst by modifying a precursor. Background technique [0002] As energy and environmental issues increasingly restrict the development of modern society, photocatalytic technology 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 qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J27/24C02F2305/10C02F2101/38C02F2101/36C02F2101/34B01J35/39B01J35/60B01J35/615
Inventor 王绩伟鲍勇霖刘雯梅勇范晓星卢雪梅
Owner LIAONING UNIVERSITY
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