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Sulfur-doped graphite-phase carbon nitride nanosheet photocatalyst and preparation method and application thereof

A graphitic carbon nitride and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of low photocatalytic activity, large particle size, small specific surface area, etc., and achieves cheap and easy-to-obtain raw materials, reduced recombination rate, and simple and fast operation. Effect

Inactive Publication Date: 2019-02-22
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-metal doped materials reported in previous studies have large particle size, small specific surface area, single morphology, and low photocatalytic activity.

Method used

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  • Sulfur-doped graphite-phase carbon nitride nanosheet photocatalyst and preparation method and application thereof
  • Sulfur-doped graphite-phase carbon nitride nanosheet photocatalyst and preparation method and application thereof
  • Sulfur-doped graphite-phase carbon nitride nanosheet photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Pure g-C 3 N 4 (CNO) photocatalyst

[0030] (1) Preparation method

[0031] Put 3.76g of melamine directly into the crucible, and in a tube furnace, carry out calcination treatment at 550°C in a nitrogen atmosphere and keep it for 4h, with a heating rate of 5°C / min, to obtain pure g-C 3 N 4 (CNO) photocatalyst.

[0032] (2) Detection

[0033] figure 1 For the XRD test pattern of the CNO prepared in embodiment 1, by figure 1 It can be seen that the sample has two diffraction peaks at 13° and 27°. It can be calculated from the formula that the grain size of the sample is about 15.2nm.

[0034] figure 2 For the TEM figure of the CNO prepared in embodiment 1, by figure 2 It can be seen that pure graphitic carbon nitride contains a very small amount of pores and can be approximately considered as a non-porous material.

Embodiment 2

[0035] Example 2 Sulfur-doped graphite phase carbon nitride nanosheet photocatalyst

[0036] (1) Preparation method

[0037] 1) Put 2.52g of melamine into a crucible, in a tube furnace, under the protection of nitrogen, raise the temperature to 450°C at a rate of 5°C / min, perform calcination and keep it for 4h, and cool naturally to obtain precursor A (solid);

[0038] 2) Grind 4.57g of thiourea, dissolve it in 100ml of deionized water and stir, add 2g of oxalic acid, stir well, put the resulting mixture into an oven and heat and dry at 80°C to obtain precursor B;

[0039] 3) Then put 2g of precursor A and 2g of precursor B into a mortar and grind them, put them in an alumina crucible after grinding, and put the crucible in a muffle furnace heated to 550°C in advance under a nitrogen environment. Calcined for 3h, naturally cooled to obtain the target product sulfur-doped graphite phase carbon nitride g-C 3 N 4 Nanosheet photocatalyst (CN1).

[0040] (2) Detection

[0041...

Embodiment 3

[0044] Example 3 application

[0045] The photocatalyst prepared in Example 1-2 was subjected to photocatalyst material performance test.

[0046] The test process is as follows: use a 300W xenon lamp as the light source, adjust the photocurrent to 20A, adjust the center of the light intensity to irradiate the sample surface, fix the position, and place the CN0 and CN1 prepared in Example 1-2 respectively at 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 5ul isopropanol liquid into the reactor, start timing after 20 minutes of light, and take samples every 20 minutes One needle, test, record the peak area of ​​isopropanol, the result is as follows Figure 5 Shown is the rate of degrading isopropanol per minute calculated after recording 6 times (lighting for two hours). The result is as Figure 5 .

[0047] Depend on Figure 5 It can be seen that the prepared sulfur-d...

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Abstract

The invention discloses a sulfur-doped graphite-phase carbon nitride nanosheet photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps that1, a nitrogen-enriched organic matter is placed in a crucible, high-temperature calcination treatment is conducted at 300-500 DEG C, the temperature is maintained for 1-10 h, and cooling is conductedto obtain a precursor A; 2, a sulfur-containing nitrogen-enriched organic matter is ground, and is dissolved in water, oxalic acid is added, and after being fully stirred, a mixture is placed in an oven, and is heated for drying at 60-120 DEG C to obtain a precursor B; 3, the precursor A and the precursor B are mixed, and are subjected to high-temperature calcination subsequently to obtain the product sulfur-doped graphite-phase carbon nitride nanosheet photocatalyst. A sulfur-doped graphite-phase carbon nitride nanometer material can provide more catalytic reaction sites, meanwhile, a builtsulfur-doped structure can trap photo-induced electrons, the photo-induced electrons and photo-induced holes are effectively separated, the recombination rate is reduced, and the photocatalytic activity is improved. The photocatalyst can effectively degrade organic pollutants when irradiated by visible light.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a sulfur-doped carbon nitride nanosheet photocatalyst and a preparation method and application thereof. Background technique [0002] With the development of human society, the problem of organic gas pollution in the environment has become prominent and has attracted people's attention. Among the current environmental purification methods, photocatalytic environmental purification technology has attracted much attention. Photocatalytic technology is a sustainable and environmentally friendly technology. It uses sunlight to degrade organic pollutants. It has the characteristics of no secondary pollution and recyclable regeneration. In recent years, graphitic carbon nitride, as a non-metallic material, has attracted extensive attention from researchers. Graphite carbon nitride has a relatively small band gap and stable photochemical properties, and is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J35/10B82Y30/00B82Y40/00B01D53/86B01D53/72
CPCB01D53/007B01D53/8668B82Y30/00B82Y40/00B01J27/24B01J37/082B01D2257/704B01D2259/802B01J35/60B01J35/39
Inventor 范晓星成祥祥韩东远裴宇鹏景新媚王绩伟
Owner LIAONING UNIVERSITY
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