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Phosphorus-sulfur co-doped graphitic carbon nitride photocatalyst, preparation method and application thereof

A phase carbon nitride light and co-doping technology, applied in the field of photocatalysis, can solve the problems of inability to achieve comprehensive improvement, poor photocatalytic activity, low light absorption efficiency, etc., and achieve good environmental protection benefits, large specific surface area, Effect of High Electron-Hole Separation Efficiency

Active Publication Date: 2019-03-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphite phase carbon nitride doped with a single element can improve the performance of carbon nitride in a certain aspect, it cannot achieve a comprehensive improvement, such as specific surface area, light absorption performance, electron-hole pair separation, etc.
Therefore, how to comprehensively improve the problems of fast recombination rate of photogenerated electron-hole pairs in graphitic carbon nitride, low specific surface area, low light absorption efficiency, and poor photocatalytic activity is of great significance for expanding the application range of graphitic carbon nitride materials.

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  • Phosphorus-sulfur co-doped graphitic carbon nitride photocatalyst, preparation method and application thereof
  • Phosphorus-sulfur co-doped graphitic carbon nitride photocatalyst, preparation method and application thereof
  • Phosphorus-sulfur co-doped graphitic carbon nitride photocatalyst, preparation method and application thereof

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Embodiment 1

[0041] A phosphorus and sulfur co-doped graphite phase carbon nitride photocatalyst of the present invention, the phosphorus and sulfur co-doped graphite phase carbon nitride photocatalyst uses hexachlorotripolyphosphazene as a phosphorus source and thiourea as a self-doping The sulfur source and the precursor of graphitic carbon nitride are prepared by calcining.

[0042] The preparation method of the phosphorus-sulfur co-doped graphite phase carbon nitride photocatalyst of the above-mentioned present embodiment comprises the following steps:

[0043] (1) Weigh 25 mg of hexachlorotrimeric phosphazene and 2 g of thiourea in an agate mortar and grind continuously for 30 min, wherein the mass ratio of hexachlorotrimeric phosphazene and thiourea is 1.25%, to obtain the mixture precursor .

[0044] (2) Put the mixture precursor obtained after uniform grinding in step (1) into a crucible, cover the crucible and put it into a muffle furnace for calcination. Control the temperature ...

Embodiment 2

[0054] A preparation method of the phosphorus-sulfur co-doped graphite phase carbon nitride photocatalyst of the present invention is basically the same as the preparation method in Example 1, the only difference being: in step (1) hexachlorotrimeric phosphazene and thiourea The mass ratio is 2.5%. The phosphorus-sulfur co-doped graphitic carbon nitride photocatalyst prepared in Example 2 is named PSCN-50.

Embodiment 3

[0056] A preparation method of the phosphorus-sulfur co-doped graphite phase carbon nitride photocatalyst of the present invention is basically the same as the preparation method in Example 1, the only difference being: in step (1) hexachlorotrimeric phosphazene and thiourea The mass ratio is 3.75%. The phosphorus-sulfur co-doped graphitic carbon nitride photocatalyst prepared in Example 3 is named PSCN-75.

[0057] PSCN-25, PSCN-50, PSCN-75 in Examples 1~3 and PCN, SCN, CN in Comparative Examples 1~3 are carried out XRD analysis, the result is as follows figure 1 shown. figure 1 It is the XRD diffraction pattern of PSCN-25, PSCN-50, PSCN-75 in Examples 1-3 of the present invention and PCN, SCN, CN in Comparative Examples 1-3. Such as figure 1 As shown, all samples contain the characteristic peaks (002) and (100) of carbon nitride, which indicates that the main body of all samples is graphite phase carbon nitride. figure 2 It is the XPS spectrum of the phosphorus-sulfur c...

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Abstract

The invention discloses a phosphorus-sulfur co-doped graphite phase carbon nitride photocatalyst and its preparation method and application. The phosphorus-sulfur co-doped graphite phase carbon nitride photocatalyst uses hexachlorotripolyphosphazene as the phosphorus source. Thiourea is used as the precursor of self-doping sulfur source and graphite phase carbon nitride, and is prepared by calcination method. The phosphorus-sulfur co-doped graphite phase carbon nitride photocatalyst of the present invention is green and environmentally friendly, completely free of metal doping, has a large specific surface area, strong visible light absorption ability, fast photogenerated charge separation rate, high photocatalytic activity, and stable chemical properties. Corrosion resistance and other advantages, its preparation method has the advantages of simplicity, easy control, readily available raw materials, low cost, and is suitable for continuous large-scale batch production. When the catalyst of the present invention is used to degrade dye wastewater, it has the advantages of stable photocatalytic performance, strong corrosion resistance, and high efficiency in degrading dye wastewater.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a phosphorus-sulfur co-doped graphite-phase carbon nitride photocatalyst and a preparation method and application thereof. Background technique [0002] In recent years, due to the increasingly prominent problems of energy crisis and environmental pollution, the use of photocatalysts to degrade pollutants in the environment has attracted extensive attention as an environmentally friendly and low-cost technology. At present, the commonly used photocatalyst is titanium dioxide. Although titanium dioxide has the advantages of non-toxicity, high efficiency and low cost, its wide band gap results in it only absorbing about 4% of the ultraviolet light in sunlight, which greatly limits its application. Therefore, it is very important to develop a photocatalyst or its composite material that can catalyze under visible light, is cheap, and has stable performance. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J27/24C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 袁兴中蒋龙波王侯梁婕吴志斌张进陈晓红李辉曾光明
Owner HUNAN UNIV