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Nitrogen-deficient g-C3N4 photocatalyst, and preparation method and application thereof

A photocatalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as insufficient photocatalytic performance, achieve good photocatalytic stability, Effect of reducing compounding and strong restoring ability

Pending Publication Date: 2020-01-10
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a nitrogen-deficient g-C 3 N 4 Photocatalyst, preparation method and application thereof, the nitrogen defect g-C 3 N 4 Photocatalyst can effectively solve the existing g-C 3 N 4 The problem of insufficient photocatalytic performance, and its preparation method is simple, the equipment requirements are low, and the cost is low

Method used

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  • Nitrogen-deficient g-C3N4 photocatalyst, and preparation method and application thereof
  • Nitrogen-deficient g-C3N4 photocatalyst, and preparation method and application thereof
  • Nitrogen-deficient g-C3N4 photocatalyst, and preparation method and application thereof

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Embodiment 1

[0021] Nitrogen deficiency g-C 3 N 4 Preparation: weigh 1g g-C 3 N 4 Add 10mL formaldehyde solution (formaldehyde content is 36.0-40.0%) and 50mL water, record it as 10-CN. Put 10-CN into a 100mL reactor and keep it warm at 160°C for 12 hours. After the reaction is completed and cooled to room temperature, the obtained sample is washed with absolute ethanol and water, and after drying, the nitrogen-deficient g-C 3 N 4 Photocatalyst (10-CN).

[0022] Nitrogen deficiency g-C by elemental analysis (EA) 3 N 4 The photocatalyst (10-CN) was tested, and the test results are shown in Table 1. It can be seen from Table 1 that the nitrogen deficiency g-C 3 N 4 The C / N mass ratio in the photocatalyst (10-CN) is 0.603;

[0023] Nitrogen deficient g-C was measured by specific surface area measuring instrument 3 N 4 The photocatalyst (10-CN) was tested for specific surface area performance, and the test results showed that the nitrogen defect g-C 3 N 4 The photocatalyst (10-CN)...

Embodiment 2

[0026] Nitrogen deficiency g-C 3 N 4 Preparation: weigh 1g g-C 3 N 4 Add 20mL formaldehyde solution (formaldehyde content is 36.0-40.0%) and 40mL water, record it as 20-CN. Put 20-CN into a 100mL reactor and keep it warm at 160°C for 12 hours. After the reaction is completed and cooled to room temperature, the obtained sample is washed with absolute ethanol and water, and after drying, the nitrogen-deficient g-C 3 N 4 Photocatalyst (20-CN).

[0027] Nitrogen deficiency g-C by elemental analysis (EA) 3 N 4 The photocatalyst (20-CN) was tested, and the test results are shown in Table 1. It can be seen from Table 1 that the nitrogen deficiency g-C 3 N 4 The C / N mass ratio in the photocatalyst (20-CN) is 0.607;

[0028] Nitrogen deficient g-C was measured by specific surface area measuring instrument 3 N 4 The photocatalyst (20-CN) was tested for specific surface area performance, and the test results showed that the nitrogen defect g-C 3 N 4 The surface area of ​​the...

Embodiment 3

[0031] Nitrogen deficiency g-C 3 N 4 Preparation: weigh 1g g-C 3 N 4 Add 30mL of formaldehyde solution (formaldehyde content is 36.0-40.0%) and 30mL of water, denoted as 30-CN. Put 30-CN into a 100mL reactor and keep it warm at 160°C for 12 hours. After the reaction is completed and cooled to room temperature, the obtained sample is washed with absolute ethanol and water, and after drying, the nitrogen-deficient g-C 3 N 4 Photocatalyst (30-CN).

[0032] Elemental Analysis (EA) for H-g-C 3 N 4 and nitrogen deficient g-C 3 N 4 Photocatalyst (30-CN) was tested, and the test results are shown in Table 1. It can be seen from Table 1 that H-g-C 3 N 4 Medium C / N mass ratio is 0.558; nitrogen deficiency g-C 3 N 4 The mass ratio of C / N in photocatalyst (30-CN) is 0.606; H-g-C 3 N 4 The C / N mass ratio in the medium is less than 30-CN, indicating that there are nitrogen defects in 30-CN.

[0033] H-g-C was measured by specific surface area measuring instrument 3 N 4 and ...

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Abstract

The invention relates to a nitrogen-deficient g-C3N4 photocatalyst, and a preparation method and an application thereof. The nitrogen-deficient g-C3N4 photocatalyst comprises 1 part by weight of g-C3N4, 10-50 parts by volume of a formaldehyde solution and 10-50 parts by volume of deionized water. The preparation method of the nitrogen-deficient g-C3N4 photocatalyst comprises the following steps: weighing 1 part by weight of g-C3N4, putting the g-C3N4 into a reaction container, adding 10-50 parts by volume of the formaldehyde solution and 10-50 parts by volume of the deionized water into the reaction container, performing uniform stirring, keeping the temperature at 160 DEG C for 12 h, cooling the obtained solution to room temperature after a reaction is finished, washing the obtained sample with anhydrous ethanol and water, and drying the sample to obtain the nitrogen-deficient g-C3N4 photocatalyst. The nitrogen-deficient g-C3N4 photocatalyst is applied to photocatalysis of Cr (VI) andwater photolysis for hydrogen production. The nitrogen-deficient g-C3N4 photocatalyst can effectively solve the problem of insufficient photocatalytic performance of existing g-C3N4, and the preparation method of the nitrogen-deficient g-C3N4 photocatalyst has the advantages of simplicity, low device requirements and low cost.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a nitrogen-deficient g-C 3 N 4 Photocatalyst, preparation method and application. Background technique [0002] With the consumption of fossil fuels and the development of industry, energy and the environment are becoming increasingly severe. Chromium and its compounds are widely used in metallurgy, electroplating, printing and dyeing and other industries, resulting in a large amount of Cr(VI)-containing wastewater. Cr(VI) is toxic, and long-term exposure can cause cancer. At present, the treatment of Cr(VI) sewage mainly includes physical treatment, chemical treatment and biological treatment. However, these three methods still cause pollution or secondary pollution to the environment. Photocatalytic technology has the advantages of green, no secondary pollution and effective conversion of solar energy. Hydrogen is considered to be an ideal alternative energy source ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04C02F1/70C02F1/30C02F1/32C02F101/22
CPCB01J27/24C01B3/042C02F1/70C02F1/30C02F1/32C02F2101/22C02F2305/10B01J35/613B01J35/647B01J35/39Y02E60/36
Inventor 余长林刘珍纪红兵樊启哲马小帅
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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