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Carbon dot modified graphite-phase carbon nitride hollow sphere photocatalyst as well as preparation method and application thereof

A graphite-phase carbon nitride and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., to achieve improved hydrogen production performance by splitting water, high practical value, and increased specific surface area

Pending Publication Date: 2021-02-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There has been no report on the introduction of carbon dot modification methods into hollow sphere carbon nitride photocatalysts

Method used

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  • Carbon dot modified graphite-phase carbon nitride hollow sphere photocatalyst as well as preparation method and application thereof
  • Carbon dot modified graphite-phase carbon nitride hollow sphere photocatalyst as well as preparation method and application thereof
  • Carbon dot modified graphite-phase carbon nitride hollow sphere photocatalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0030] A carbon dot-modified graphite-phase carbon nitride hollow sphere photocatalyst, the photocatalyst is prepared from a graphite-like phase carbon nitride precursor and a carbon-dot precursor mixture as a product precursor through a hard template method; the graphite-like The precursor of phase carbon nitride is cyanamide; the precursor of carbon dots is glucose.

[0031] Its preparation method comprises the following steps:

[0032] (1) Weigh 5 g of cyanamide and 5 mg of glucose into an aqueous solution in which 1 g of silica sol is dissolved, and obtain a white powder after ultrasonication, stirring at 60°C, centrifugation, washing, and drying;

[0033] (2) The white powder was kept in a tube furnace at 550°C for 4 h, and argon gas was continuously introduced as a protective gas during the heat preservation process, and then naturally cooled to room temperature to obtain a yellow powder;

[0034] (3) Add the yellow powder to 4 mol / L NH 4 HF 2 Stir in the aqueous solu...

Embodiment 2

[0036] A carbon dot-modified graphite-phase carbon nitride hollow sphere photocatalyst, the photocatalyst is prepared from a graphite-like phase carbon nitride precursor and a carbon-dot precursor mixture as a product precursor through a hard template method; the graphite-like The precursor of phase carbon nitride is cyanamide; the precursor of carbon dots is glucose.

[0037] Its preparation method comprises the following steps:

[0038](1) Weigh 5 g of cyanamide and 10 mg of glucose into an aqueous solution in which 1 g of silica sol is dissolved, and obtain a white powder after ultrasonication, stirring at 60°C, centrifugation, washing, and drying;

[0039] (2) The white powder was kept in a tube furnace at 550°C for 4 h, and argon gas was continuously introduced as a protective gas during the heat preservation process, and then naturally cooled to room temperature to obtain a yellow powder;

[0040] (3) Add the yellow powder to 4 mol / L NH 4 HF 2 Stir in the aqueous solu...

Embodiment 3

[0042] A carbon dot-modified graphite-phase carbon nitride hollow sphere photocatalyst, the photocatalyst is prepared from a graphite-like phase carbon nitride precursor and a carbon-dot precursor mixture as a product precursor through a hard template method; the graphite-like The precursor of phase carbon nitride is cyanamide; the precursor of carbon dots is maltose.

[0043] Its preparation method comprises the following steps:

[0044] (1) Weigh 5 g of cyanamide and 5 mg of maltose into an aqueous solution in which 1 g of silica sol is dissolved, and obtain a white powder after operations such as ultrasonication, stirring at 60°C, centrifugation, washing, and drying;

[0045] (2) The white powder was kept in a tube furnace at 550°C for 4 h, and argon gas was continuously introduced as a protective gas during the heat preservation process, and then naturally cooled to room temperature to obtain a yellow powder;

[0046] (3) Add the yellow powder to 4 mol / L NH 4 HF 2 Stir ...

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Abstract

The invention relates to preparation and application of a carbon dot modified graphite-phase carbon nitride hollow sphere photocatalyst, and belongs to the technical field of material preparation andphotocatalysis. The photocatalyst is obtained by taking a mixture of a graphite-phase carbon nitride precursor and a carbon dot precursor as a precursor of a product and mesoporous silica as a hard template through an in-situ thermal polymerization and template etching method, and the photocatalyst is applied to a photocatalytic reaction. The carbon dot modified graphite-phase carbon nitride prepared by the method has a hollow sphere structure, uniform material particle size and good visible light absorption capability. Compared with a traditional carbon nitride material, the material has a large specific surface area and a high sunlight absorption and utilization rate, and can show efficient photocatalytic performance under visible light. The material provided by the invention is simple in preparation method, high in catalytic efficiency and low in price, meets actual production requirements and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a carbon point-modified graphite-phase carbon nitride hollow sphere photocatalyst and a preparation method and application thereof. Background technique [0002] With the massive exploitation and use of fossil fuels, the problems of environmental pollution and energy shortage are becoming more and more serious. People have been committed to seeking clean energy that can be used to replace fossil fuels, and hydrogen has attracted widespread attention due to its green and renewable characteristics. The use of solar energy in nature for photocatalytic water splitting to produce hydrogen has become a current research hotspot. In recent years, graphite-like carbon nitride materials have shown promising development prospects as a metal-free photocatalyst in the field of photocatalytic water splitting for hydrogen production. However, graphi...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/08B01J35/10C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/51B01J35/61B01J35/39Y02E60/36
Inventor 徐慎刚林治刘应良曹少魁丁远张丽石军王昆仑
Owner ZHENGZHOU UNIV
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