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Graphite-like carbon nitride-based photocatalytic composite material as well as preparation method and application thereof

A composite material and carbon nitride technology, applied in the field of photocatalytic materials, can solve the problems of limited photocatalytic efficiency and limited absorption of visible light with low surface area, and achieve high photocatalytic efficiency, good photocatalytic efficiency and reduced recombination rate.

Active Publication Date: 2020-06-19
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The band gap of carbon nitride is suitable for various applications of visible light catalysis, but the practical application is limited by fast charge carrier recombination, low surface area and limited absorption of visible light; for pure phase g-C 3 N 4 There are many shortcomings that affect the improvement of its photocatalytic performance, especially the high electron-hole recombination rate, which seriously limits its photocatalytic efficiency; thus improving the g-C 3 N 4 Photocatalytic performance, improving its electron-hole separation rate has always been the focus of research in this field

Method used

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  • Graphite-like carbon nitride-based photocatalytic composite material as well as preparation method and application thereof
  • Graphite-like carbon nitride-based photocatalytic composite material as well as preparation method and application thereof
  • Graphite-like carbon nitride-based photocatalytic composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a g-C 3 N 4 The preparation method of base photocatalytic composite material comprises the following steps:

[0037] (1) Under normal temperature conditions, weigh 20 g of urea and 2 mg of TAPB in a grinding bowl, grind the raw materials until the powdery particles are mixed uniformly, and obtain a mixture of the two;

[0038](2) The mixture is placed in a 100ml alumina crucible with a cover, and then the crucible is placed in a muffle furnace, and the temperature is gradually raised to 550°C at a heating rate of 10°C / min, and then heated at a constant temperature of 550°C for 4h;

[0039] (3) Naturally cool to room temperature, and grind the obtained sample sufficiently again.

[0040] A kind of g-C is prepared by the above steps 3 N 4 Based photocatalytic composite material, the sample is named UCN-2TAPB.

Embodiment 2

[0042] a g-C 3 N 4 The preparation method of base photocatalytic composite material comprises the following steps:

[0043] (1) Under normal temperature conditions, weigh 20 g of urea and 4 mg of TAPB in a grinding bowl, grind the raw materials until the powdery particles are mixed uniformly, and obtain a mixture of the two;

[0044] (2) The mixture is placed in a 100ml alumina crucible with a cover, and then the crucible is placed in a muffle furnace, and the temperature is gradually raised to 550°C at a heating rate of 10°C / min, and then heated at a constant temperature of 550°C for 4h;

[0045] (3) Naturally cool to room temperature, and grind the obtained sample sufficiently again.

[0046] Compared with Example 1, the only difference is that the amount of TAPB added is 4 mg, and the prepared sample is named UCN-4TAPB.

Embodiment 3

[0048] a g-C 3 N 4 The preparation method of base photocatalytic composite material comprises the following steps:

[0049] (1) Under normal temperature conditions, weigh 20 g of urea and 6 mg of TAPB in a grinding bowl, grind the raw materials until the powdery particles are mixed uniformly, and obtain a mixture of the two;

[0050] (2) The mixture is placed in a 100ml alumina crucible with a cover, and then the crucible is placed in a muffle furnace, and the temperature is gradually raised to 550°C at a heating rate of 10°C / min, and then heated at a constant temperature of 550°C for 4h;

[0051] (3) Naturally cool to room temperature, and grind the obtained sample sufficiently again.

[0052] Compared with Example 1, the only difference is that the amount of TAPB added is 6 mg, and the prepared sample is named UCN-6TAPB.

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Abstract

The invention discloses a graphite-like carbon nitride-based photocatalytic composite material as well as a preparation method and application thereof. The material is a g-C3N4-based photocatalytic composite material of an organic monomer TAPB grafted CN network, the electron hole separation rate of the material can be improved, and the photocatalytic performance of g-C3N4 is improved. The preparation method comprises the following step of carrying out polymerization reaction by taking urea and TAPB as monomers, which specifically comprises the following sub-steps: S1, grinding urea and TAPB;S2, calcining the mixture obtained in the step S1 for 3h to 6h at the temperature of 500 DEG C to 600 DEG C; and S3, cooling the sample obtained in the step S2 to room temperature, and fully grindingagain to obtain the material. A CN network structure is grafted through TAPB, so that pi electron delocalization of the material is enhanced, rapid migration of photo-induced electrons is facilitated,rapid recombination of photo-induced carriers is inhibited, and remarkable improvement of photocatalytic performance is promoted.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a graphite-like carbon nitride-based photocatalytic composite material and a preparation method and application thereof. Background technique [0002] Photocatalytic technology is a technology that uses photocatalysts to catalyze reactions under light conditions. It is a green technology that has important application prospects in the fields of energy and the environment. Since the 21st century, the excessive use of fossil energy has led to a global energy crisis and environmental crisis, so the establishment of a clean energy system is imminent. As a renewable and clean energy, hydrogen plays an important role in this system. Not only that, it can also be used in fuel cells, and even more so in the chemical industry. Hydrogen production by photolysis of water is an important way to convert solar energy into usable energy, and it is also an effective way to store solar en...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042B01J35/39Y02E60/36Y02P20/133
Inventor 许成群杨嘉乐刘晓露陈泽源
Owner WUYI UNIV
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