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High-efficiency carbon self-doped graphite phase carbon nitride visible light photocatalyst, and preparation method and application thereof

A graphitic carbon nitride, self-doping technology, applied in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as low hydrogen production efficiency, achieve inhibition of recombination, simple preparation process, absorption The effect of improved range and absorption strength

Inactive Publication Date: 2017-06-30
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of low photocatalytic hydrogen production efficiency of the existing carbon self-doped graphite phase carbon nitride catalyst, the present invention aims to provide a high-efficiency carbon self-doped graphite phase carbon nitride visible light catalyst and its preparation method and application

Method used

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  • High-efficiency carbon self-doped graphite phase carbon nitride visible light photocatalyst, and preparation method and application thereof
  • High-efficiency carbon self-doped graphite phase carbon nitride visible light photocatalyst, and preparation method and application thereof
  • High-efficiency carbon self-doped graphite phase carbon nitride visible light photocatalyst, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0025] Example 1: Preparation of high-efficiency carbon self-doped graphite phase carbon nitride catalyst for visible light.

[0026] Add melamine (2g) and 2,4,6-triaminopyrimidine (0.03g) into ethanol (6mL), stir evenly, evaporate the ethanol to dryness, and grind thoroughly to obtain a mixture. The above mixture was placed under vacuum conditions at 100°C for 12h, and then placed in a muffle furnace for heat treatment at 550°C for 4h to obtain a high-efficiency carbon self-doped graphite phase carbon nitride catalyst (0.90g), and its X-ray diffraction pattern is as follows figure 1 As shown, its Fourier transform infrared spectrum is shown as figure 2 shown.

[0027] Depend on figure 1 It can be seen that the two obvious diffraction peaks at 13.0° and 27.4° belong to the (100) and (002) crystal planes of graphitic carbon nitride, respectively. Depend on figure 2 It can be seen that at 810cm -1 and 1200~1600cm -1 The peaks at are assigned to the breathing vibration of...

Embodiment 2

[0028] Example 2: Preparation of high-efficiency carbon self-doped graphite phase carbon nitride catalyst for visible light.

[0029] Add melamine (2 g) and 2-amino-4,6-dihydroxypyrimidine (0.02 g) into ethanol (10 mL), stir evenly, evaporate the ethanol to dryness, and grind thoroughly to obtain a mixture. The above mixture was placed under vacuum at 80°C for 10h, and then placed in a muffle furnace for heat treatment at 530°C for 5h to obtain a highly efficient carbon self-doped graphite phase carbon nitride catalyst (0.88g).

Embodiment 3

[0030] Example 3: Preparation of high-efficiency carbon self-doped graphite phase carbon nitride catalyst for visible light.

[0031] Add melamine (2g) and 2-amino-4,6-dihydroxypyrimidine (0.04g) into water (30mL), stir evenly, evaporate the water to dryness, and grind thoroughly to obtain a mixture. The above mixture was placed under vacuum conditions at 120°C for 24h, and then placed in a muffle furnace for heat treatment at 520°C for 6h to obtain a highly efficient carbon self-doped graphite phase carbon nitride catalyst (0.87g).

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Abstract

The invention belongs to the technical field of material preparation and photocatalysis, and relates to a high-efficiency carbon self-doped graphite phase carbon nitride visible light photocatalyst, and a preparation method and an application thereof. The visible light photocatalyst takes melamine as a precursor, small organic molecules (amino and / or hydroxyl substituted pyrimidine) with different carbon-nitrogen ratios are used as a self-doping carbon source, and the materials are mixed evenly and subjected to vacuum heat treatment and heat copolymerization to obtain the product. The preparation process is simple, environmentally friendly and low in cost. Compared with ordinary graphite phase carbon nitride, the visible light photocatalyst is improved in the absorption range and the absorption intensity in a visible light region, and can control the visible light response range through changing the doping amount. In addition, the visible light photocatalyst overcomes the shortcomings of the traditional graphite phase carbon nitride, reduces the recombination rate of photogenerated charge carriers, and improves the effects of producing hydrogen through visible light catalytic decomposition of water.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and relates to a high-efficiency carbon self-doping graphite phase carbon nitride visible light catalyst, its preparation method based on a thermal copolymerization synthesis method, and its application in visible light catalytic decomposition of water to produce hydrogen. Background technique [0002] Today, human beings' excessive dependence on fossil energy has exacerbated the energy crisis and environmental pollution, so it is urgent to find recyclable clean energy. Semiconductor-based photocatalysts are considered to be one of the most promising technologies for solving global energy and environmental problems. However, photocatalysts have problems such as instability, low activity, high cost, and low utilization of solar energy, which limit the application of photocatalysts in real life. Therefore, obtaining an efficient, stable, environmentally friendly and...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J27/24C01B2203/0277B01J35/39Y02E60/36
Inventor 孙建华刘奉曹鑫牟志刚
Owner JIANGSU UNIV OF TECH
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