Synthesis method of graphite phase carbonitride homotype heterojunction photocatalysis material with multilayer structure and application

A technology of graphitic carbon nitride and photocatalytic materials, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of less research, small specific surface area, and serious photogenerated electron-hole recombination and other problems, to achieve the effects of mild conditions, enhanced absorption, and simple synthesis methods

Inactive Publication Date: 2017-05-31
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] g-C obtained by thermal polycondensation 3 N 4 As a photocatalyst, there are still two key problems: small specific surface area and severe photogenerated electron-hole recombination, which restrict its large-scale application in the fields of energy and environmental photocatalysis.
However, there are relatively few studies in this area

Method used

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  • Synthesis method of graphite phase carbonitride homotype heterojunction photocatalysis material with multilayer structure and application
  • Synthesis method of graphite phase carbonitride homotype heterojunction photocatalysis material with multilayer structure and application
  • Synthesis method of graphite phase carbonitride homotype heterojunction photocatalysis material with multilayer structure and application

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Experimental program
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Embodiment 1

[0023] Embodiment 1: Synthesis of graphite phase carbon nitride homogeneous heterojunction photocatalytic material with multi-level structure, the method is as follows:

[0024] Step 1. At room temperature, weigh 0.126g of melamine powder and 0.129g of cyanuric acid powder, disperse them in 150ml of deionized water, and stir for 4h at a speed of 8000r / min to obtain a melamine / cyanuric acid suspension; weigh 0.5 g urea, dissolved in 5mL deionized water to obtain 0.1g / ml urea aqueous solution;

[0025] Step 2, disperse the suspension obtained in step 1 into a hydrothermal kettle, place it in a muffle furnace and heat it at 180°C, react for 6 hours, and cool it down to room temperature naturally; centrifuge to obtain melamine / cyanuric acid that has completed the assembly reaction macromolecular crystals;

[0026] Step 3: Add 0.5 g of the melamine / cyanuric acid macromolecular crystal prepared in step 2 to the urea aqueous solution configured in step 1, mix and stir for 4 hours, a...

Embodiment 2

[0033] Embodiment 2: Synthesis of graphite phase carbon nitride homogeneous heterojunction photocatalytic material with multi-level structure, the method is as follows:

[0034] Step 1, with embodiment 1 step 1, make melamine / cyanuric acid suspension and 0.2g / ml urea aqueous solution;

[0035] Step 2, make melamine / cyanuric acid macromolecular crystal with embodiment 1 step 2;

[0036] Step 3, adding 1 g of the melamine / cyanuric acid macromolecular crystal prepared in step 2 to the urea aqueous solution configured in step 1, mixing and stirring for 6 hours, and centrifuging to obtain a urea-(melamine / cyanuric acid) composite precursor;

[0037] Step 4. The urea-(melamine / cyanuric acid) composite precursor prepared in step 3 was dried overnight at 60°C, and then calcined at 520°C for 2 hours in a nitrogen atmosphere in a tube furnace to obtain g-C 3 N 4 Nanoparticles deposited on g-C 3 N 4 Multi-hierarchical g-C on microtubes 3 N 4 The homogeneous heterojunction photocat...

Embodiment 3

[0041] Example 3 Synthesis of a graphitic phase carbon nitride homogeneous heterojunction photocatalytic material with a multi-level structure, the steps are basically the same as in Example 2, the only difference is: in step 4, the calcination temperature is changed from 520 ° C to 500 ° C, and finally with g-C 3 N 4 Nanoparticles deposited on g-C 3 N 4 Multi-hierarchical g-C on microtubes 3 N 4 The homogeneous heterojunction photocatalytic material is denoted as TCNH-3 photocatalyst.

[0042] Observation by scanning electron microscope (SEM), TCNH-1 photocatalyst, TCNH-2 photocatalyst and TCNH-3 photocatalyst obtained in embodiment 1-3 all present the structure of g-C3N4 nanoparticle deposition g-C3N4 microtube, wherein The particle size of g-C3N4 is about 200nm, and they are distributed on the surface of g-C3N4 microtubes with a diameter of about 1.5μm.

[0043] The graphitic phase carbon nitride homogeneous heterojunction photocatalytic material with multi-level stru...

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Abstract

The invention discloses a synthesis method of a graphite phase carbonitride homotype heterojunction photocatalysis material with a multilayer structure. The method comprises the following steps of preparing a melamine / cyanuric acid suspension and urea water solution; performing preparation by using the melamine / cyanuric acid suspension to obtain melamine / cyanuric acid suspension macromolecular crystals completing the assembly reaction; adding the melamine / cyanuric acid suspension macromolecular crystals into the urea water solution; performing calcination on the urea-(melamine / cyanuric acid) composite precursor obtained through preparation to obtain the graphite phase carbon nitride (g-C3N4) homotype heterojunction photocatalysis material with multilayer structures with g-C3N4 nanometer particles deposited on the g-C3N4 micrometer tubes. The synthesis method provided by the invention has the advantages that the conditions are mild; the preparation process is simple and convenient; the controllability is high; the obtained photocatalysis material can be applied to methyl orange degradation in visible light; the effect is obvious.

Description

technical field [0001] The present invention relates to a g-C with a multi-level structure 3 N 4 The simple synthesis of homogeneous heterojunction photocatalysts belongs to the synthesis and structure construction of non-metallic materials, and can be applied to the degradation of organic pollutants. Background technique [0002] At present, photocatalytic technology is widely used in the control of environmental pollution and the utilization of solar energy. It can convert low-density solar energy into high-density chemical energy or directly degrade and mineralize organic pollutants. Pollution and other issues have important application prospects. TiO 2 Due to its low price and stable chemical properties, it has become the most widely studied and applied catalyst. But TiO 2 The band gap is wide, and it can only absorb ultraviolet light with a wavelength less than 387nm, which limits its utilization efficiency of solar energy. At the same time, the polymer semiconduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCB01J27/24B01J35/004B01J35/023C02F1/30C02F2101/30
Inventor 姜忠义佟振伟杨冬
Owner TIANJIN UNIV
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