A kind of two-dimensional carbon-nitrogen-based composite material photocatalyst and its preparation method and application

A technology of composite materials and carbon-nitrogen materials, applied in the field of photocatalytic materials, can solve the problems of reducing the band gap of photocatalysts, and achieve the effects of separating charges, suppressing reverse reactions, and improving effective transmission

Active Publication Date: 2021-12-21
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This also makes it difficult to reduce the bandgap of photocatalysts

Method used

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  • A kind of two-dimensional carbon-nitrogen-based composite material photocatalyst and its preparation method and application
  • A kind of two-dimensional carbon-nitrogen-based composite material photocatalyst and its preparation method and application
  • A kind of two-dimensional carbon-nitrogen-based composite material photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The two-dimensional carbon-nitrogen material used in the present invention can be a single-layer two-dimensional carbon-nitrogen material, or a multi-layer two-dimensional carbon-nitrogen material. Among them, the single-layer carbon-nitrogen material is preferably a graphite-like phase nitrogen carbide material, including but not limited to single-layer CN, single-layer C 2 N or single layer C 3 N 4 . The present invention has no special limitation on the source of the single-layer or multi-layer carbon-nitrogen material, which may be commercially available or prepared according to methods well known to those skilled in the art.

[0032] The preparation of single-layer graphite-like nitrogen carbide material CN is as follows:

[0033] S1, the C 3 h 6 N 6 React in a muffle furnace at a heating rate of 12°C / min to 500°C for 4 hours, and the reaction is carried out in an atmospheric environment;

[0034] S2. Take 600mg of the product obtained in S1, put it in a muf...

Embodiment 2

[0037] The single-layer carbon-nitrogen material CN prepared in Example 1 is used as a raw material to prepare a Pd-loaded carbon-nitrogen-based composite material, which is prepared as follows:

[0038] S1. Disperse CN in 1-butyl-3-methylimidazolium salt solution, add KOH and sonicate for 30 minutes.

[0039] S2. After ultrasonication, the solution is uniformly dispersed, and Na 2 PdCl 4 Stir at room temperature for 30 min.

[0040] S3. Add ascorbic acid and stir at room temperature for 30 minutes, then raise the temperature to 90° C., stir and react for 6 hours, and then cool.

[0041] S4. Finally, wash with ethanol and deionized water for several times to obtain.

[0042] Using the single-layer carbon-nitrogen material CN prepared in Example 1 as a raw material to prepare a Co-loaded carbon-nitrogen-based composite material, the difference between its preparation and the preparation method of the Pd-loaded carbon-nitrogen-based composite material is that acetic acid is add...

Embodiment 3

[0048] The carbon-nitrogen-based composites co-loaded with Pd and Co were prepared as follows:

[0049] S1. Disperse the Pd-loaded carbon-nitrogen-based composite material prepared in Example 2 in water to prepare 200 mL of a mixed suspension of 0.1 mg / mL, then add 700 μL of 25 wt % ammonia, mix well by ultrasonication for 1 h, and then add 80 μL of hydrazine , after reacting at 95° C. for 6 h, vacuum filter with a mixed cellulose ester membrane filter, peel the product from the filter membrane, and freeze-dry to obtain a Pd-loaded film;

[0050] S2, using the carbon-nitrogen-based composite material loaded with Co prepared in Example 3 as a raw material, adopt the same method in S1 to obtain a Co-loaded film;

[0051] S3, fixedly connecting the Pd-loaded thin film and the Co-loaded thin film to the same base material silicon wafer, so as to obtain a carbon-nitrogen-based composite material loaded with Pd and Co together.

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Abstract

The invention discloses a two-dimensional carbon-nitrogen-based composite material photocatalyst and its preparation method and application, and relates to the technical field of photocatalytic materials. The two-dimensional carbon-nitrogen-based composite material is a two-dimensional carbon-nitrogen material loaded with transition metal elements The prepared two-dimensional carbon-nitrogen-based composite material can reduce the band gap to form a Z-scheme system, the top of the valence band is lower than the oxidation potential of water, and the bottom of the conduction band is higher than the reduction potential of water. In the present invention, electrons can be effectively transported inside the Z-scheme system composed of a two-dimensional carbon-nitrogen-based composite material photocatalyst, and the photocatalyst can simultaneously perform two reactions of hydrogen production and oxygen production on two reaction sites, and Since the band gap of the composite material is reduced after the transition metal ions are loaded, light energy in the visible range can be effectively utilized, and the problem of difficult transport of existing reactive electrons at the interface can be solved.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a two-dimensional carbon-nitrogen-based composite material photocatalyst and its preparation method and application. Background technique [0002] Fossil energy shortage and environmental pollution are two major problems facing human development today, and photocatalytic water splitting reaction can activate water molecule H through solar energy. 2 O, promotes the reaction, lowers the potential barrier, and produces hydrogen, a clean energy carrier. Since the combustion and utilization of hydrogen produces clean water, photolysis of water technology has shown great potential in terms of new energy and environmental governance, with significant advantages such as low cost, environmental friendliness and sustainable development. [0003] Using TiO from Fujishima, University of Tokyo, Japan 2 After the single crystal undergoes a photocatalytic reaction to split wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J27/24B01J35/004C01B2203/0277Y02E60/36
Inventor 江俊罗毅谢李燕李鑫王翕君杨丽
Owner UNIV OF SCI & TECH OF CHINA
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