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Melem/g-C3N4 composite material prepared through thermal polymerization, and preparation method and application thereof

A composite material and melem technology, applied in the field of melem/g-C3N4 composite materials and their preparation, can solve the problems of limited photocatalytic application, low photocatalytic efficiency, etc., and achieve wide application prospects, high separation efficiency, high yield effect

Inactive Publication Date: 2017-04-19
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but since g-C 3 N 4 The high electron recombination rate leads to its low photocatalytic efficiency, which limits its photocatalytic application.

Method used

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  • Melem/g-C3N4 composite material prepared through thermal polymerization, and preparation method and application thereof
  • Melem/g-C3N4 composite material prepared through thermal polymerization, and preparation method and application thereof
  • Melem/g-C3N4 composite material prepared through thermal polymerization, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of melem / g-C by thermal polymerization 3 N 4 Composite materials, including the following steps:

[0028] 1) Take dicyandiamide, the reaction source material, and place it in an alumina crucible with a gas outlet, raise the temperature of the system to 400°C and keep it warm for 8 hours to obtain the crude product; the heating rate during heating is 15°C / min;

[0029] 2) Post-processing: The crude product is first ground with an agate grinder for 10 minutes, and then added with a cleaning solution to clean and centrifuge at a speed of 6000 rpm. After centrifugation, it can be dried at 100°C with heat preservation; the cleaning solution is water and alcohol The mixture; the mixing ratio of water and alcohol in the cleaning solution is 1:1, and the number of centrifugation is 3 times.

Embodiment 2

[0031] Preparation of melem / g-C by thermal polymerization 3 N 4 Composite materials, including the following steps:

[0032] 1) Take dicyandiamide, the reaction source material, and place it in an alumina crucible with a gas outlet, raise the temperature of the system to 530°C and keep it warm for 0.5h to obtain the crude product; the heating rate during heating is 5°C / min;

[0033] 2) Post-processing: first grind the crude product with an agate grinder for 10 minutes, then add a cleaning solution to clean and centrifuge at a speed of 3000 rpm, and then dry it at 40°C after centrifugation; the cleaning solution is water and alcohol The mixture; the mixing ratio of water and alcohol in the cleaning solution is 1:1, and the number of centrifugation is 3 times.

Embodiment 3

[0035] Preparation of melem / g-C by thermal polymerization 3 N 4 Composite materials, including the following steps:

[0036] 1) Take the reaction source material dicyandiamide, place it in an alumina crucible with a gas outlet, raise the temperature of the system to 380°C and keep it warm for 10 hours to obtain the crude product; the heating rate during heating is 30°C / min;

[0037]2) Post-processing: The crude product is first ground with an agate grinder for 10 minutes, and then added with a cleaning solution to clean and centrifuge at a speed of 9000 rpm. After centrifugation, it can be dried at 80°C with heat preservation; the cleaning solution is water and alcohol The mixture of water and alcohol in the cleaning solution is 1:1, and the number of times of cleaning and centrifugation is 3 times.

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PUM

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Abstract

The invention provides a method for preparing a melem / g-C3N4 composite material through thermal polymerization. The method comprises the following steps: 1) adding a source material of thermal polymerization, i.e., dicyanodiamide or melamine, into a high-temperature-resistant container with a gas outlet, heating a system to 380 to 530 DEG C and maintaining the temperature for 0.5 to 10 h so as to obtain a crude product; and 2) carrying out post-treatment by subjecting the crude product to grinding and centrifugal cleaning. The melem / g-C3N4 composite material prepared in the invention can adjust a band gap structure, reduce the probability of reduction in efficiency since a single C3N4 electron hole is prone to compounding, improve the separation efficiency of electron holes and enhance photocatalysis effect; and a prepared photocatalysis brick is extensively applicable to tunnels and building surfaces and to treatment of water pollution.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite materials, in particular to a kind of melem / g-C prepared by thermal polymerization 3 N 4 Composite materials and their preparation methods and applications. Background technique [0002] Visible light photocatalyst has become the most popular research topic in photocatalysis due to its wide range of applications, such as the application of gas pollution treatment, water pollution treatment and indoor environment purification treatment. However, high-yield and high-efficiency photocatalysts have always been the focus of research. In general, the performance of photocatalysts is mainly determined by the physical and chemical properties of the semiconductor material itself, such as band gap, surface electronic structure, specific surface area, and morphology. The band gap structure of the material determines the position of the energy band, the absorption spectrum and the mobility...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01D53/86B01D53/56
CPCB01D53/8628B01J31/0244B01D2258/06B01J35/39
Inventor 鲁浈浈刘栋许里杰
Owner CHONGQING JIAOTONG UNIVERSITY