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Nonmetallic functional group edge modified composite photocatalyst as well as preparation method and application thereof

A technology of composite light and catalyst, used in non-metallic elements, chemical instruments and methods, physical/chemical process catalysts, etc.

Inactive Publication Date: 2020-10-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Graphite-like carbon nitride (g-C 3 N 4 ) has become one of the research hotspots in the field of solar energy conversion due to its unique advantages of abundant raw materials, convenient synthesis, suitable electronic band structure, high physical and chemical stability, and environmental friendliness. However, due to the transfer of photogenerated carriers to the surface The process of photogenerated electron-hole pairs has a high recombination rate, so using pure g-C 3 N 4 As a photocatalyst for photohydrogen evolution, it cannot be further applied, and it is urgent to find a material that can improve the separation efficiency of photogenerated carriers to enhance the H 2 The precipitation activity, thereby improving the g-C 3 N 4 photocatalytic activity

Method used

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  • Nonmetallic functional group edge modified composite photocatalyst as well as preparation method and application thereof
  • Nonmetallic functional group edge modified composite photocatalyst as well as preparation method and application thereof
  • Nonmetallic functional group edge modified composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: g-C 3 N 4 Preparation of photocatalyst and its photolysis of water for hydrogen production

[0028] (1) Preparation of g-C 3 N 4 Nanosheets:

[0029] Put a certain amount of urea in an oven at 70°C to dry overnight. The dried urea is ground into powder and put into a crucible with a lid. -1 The heating rate was raised to 550°C and calcined for 4h. After cooling down to room temperature, g-C is obtained 3 N 4 . At the same time, it was tried at 2.5°C min -1 The heating rate was increased to 500 ° C for 4 h and 2.5 ° C min -1 The heating rate was increased to 600 ° C for 2 h to prepare g-C 3 N 4 .

[0030] (2) g-C 3 N 4 Composite photocatalyst photolysis of water for hydrogen production:

[0031] 50mg g-C 3 N 4 Nanosheets were uniformly dispersed in 100ml 20vol% triethanolamine (TEOA) aqueous solution with pH=11.4, and added according to g-C 3 N 4 Add H to 3% of the mass of the nanosheets 2 PtCl 6 ·H 2 O (1.5ml, 1mg / ml Pt) in water. After...

Embodiment 2

[0032] Example 2: g-C 3 N 4 Preparation of / 4-PTSC-5 photocatalyst and its photolysis of water for hydrogen production

[0033] (1) Preparation of g-C 3 N 4 / 4-PTSC-5 photocatalyst:

[0034] Weigh 20g of dried urea and 5mg of 4-PTSC, grind them in a mortar, disperse 4-PTSC evenly in urea, put them into a crucible, and heat them in a muffle furnace from room temperature at 2.5°C min -1 The heating rate was raised to 550°C and calcined for 4h. After cooling down to room temperature, g-C is obtained 3 N 4 / 4-PTSC-5. At the same time, it was tried at 2.5°C min -1 The heating rate was increased to 500 ° C for 4 h and 2.5 ° C min -1 The heating rate was increased to 600 ° C for 2 h to prepare g-C 3 N 4 / 4-PTSC-5.

[0035] (2) g-C 3 N 4 / 4-PTSC-5 composite photocatalyst photolysis of water for hydrogen production:

[0036] 50mg g-C 3 N 4 / 4-PTSC-5 nanosheets are uniformly dispersed in 100ml 20vol% pH=11.4 triethanolamine (TEOA) aqueous solution, and add g-C 3 N 4 ...

Embodiment 3

[0037] Example 3: g-C 3 N 4 Preparation of / 4-PTSC-15 photocatalyst and its photolysis of water for hydrogen production

[0038] (1) Preparation of g-C 3 N 4 / 4-PTSC-15 photocatalyst:

[0039] Weigh 20g of dried urea and 15mg of 4-PTSC, grind them in a mortar, disperse 4-PTSC evenly in urea, put them into a crucible, and heat them in a muffle furnace from room temperature at 2.5°C min -1 The heating rate was raised to 550°C and calcined for 4h. After cooling down to room temperature, g-C is obtained 3 N 4 / 4-PTSC-15. At the same time, it was tried at 2.5°C min -1 The heating rate was increased to 500 ° C for 4 h and 2.5 ° C min -1 The heating rate was increased to 600 ° C for 2 h to prepare g-C 3 N 4 / 4-PTSC-15.

[0040] (2) g-C 3 N 4 / 4-PTSC-15 composite photocatalyst photolysis of water for hydrogen production:

[0041] 50mg g-C 3 N 4 / 4-PTSC-15 nanosheets are uniformly dispersed in 100ml 20vol% pH=11.4 triethanolamine (TEOA) aqueous solution, and add g-C ...

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Abstract

The invention belongs to the technical field of nano material synthesis, and relates to a non-metal functional group edge modified composite photocatalyst as well as a preparation method and application thereof, in particular to a g-C3N4 / 4-PTSC composite photocatalyst as well as a preparation method and application thereof. According to the method, a g-C3N4 / 4-PTSC nano sheet is synthesized in onestep by utilizing an efficient and convenient thermal polycondensation method, the g-C3N4 / 4-PTSC photocatalyst with a stable structure is formed, and stable and efficient hydrogen production by photolysis of water is realized; the prepared photocatalyst has good stability and repeatability and has the advantages that the separation efficiency of photo-induced electron-hole pairs is high, the preparation method is simple and rapid, the cost is low, no pollution is caused to the environment, and the hydrogen production performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis, and relates to a composite photocatalyst modified with non-metallic functional group edges, a preparation method and application thereof. Background technique [0002] In today's society, people's requirements for the quality of the environment on which they live are getting higher and higher. Hydrogen energy has the advantages of high combustion calorific value, clean combustion process, and no pollution. It is a secondary energy source with a very promising future. At the same time, the technology of photo-splitting water to produce hydrogen, which converts solar energy into usable energy, is considered to be one of the most promising green technologies to alleviate the global energy crisis and has attracted extensive interdisciplinary attention. The key to this technology lies in the development of highly efficient and low-cost photocatalysts as a researchable alternative. [0...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/39Y02E60/36
Inventor 李春梅周廷旭于思宇武慧慧张平凡董红军
Owner JIANGSU UNIV
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