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Graphite-phase carbon nitride nanosheet-based composite photocatalytic material as well as preparation method and application thereof

A graphitic carbon nitride and composite photocatalysis technology, which is applied in the field of photocatalytic materials, can solve the problems of easy agglomeration, uneven distribution, uneven mechanical mixing, etc., and achieves mild reaction conditions, simple preparation process and simple operation. Effect

Inactive Publication Date: 2019-01-01
JINGDEZHEN CERAMIC INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mechanical mixing has the problems of uneven mixing and poor interface performance between different materials; the distribution of the oxide of the compound semiconductor material prepared by the hydrothermal method on the two-dimensional carbon nitride cannot be controlled, resulting in uneven distribution. Partially easy to reunite
At present, the graphite phase carbon nitride composite photocatalytic materials have the problem of low photocatalytic activity.

Method used

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  • Graphite-phase carbon nitride nanosheet-based composite photocatalytic material as well as preparation method and application thereof
  • Graphite-phase carbon nitride nanosheet-based composite photocatalytic material as well as preparation method and application thereof
  • Graphite-phase carbon nitride nanosheet-based composite photocatalytic material as well as preparation method and application thereof

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preparation example Construction

[0027] The invention provides a preparation method of a graphite-phase carbon nitride nanosheet-based composite photocatalytic material, comprising the following steps:

[0028] Provide graphite phase carbon nitride;

[0029] Mixing the graphitic carbon nitride with an inorganic alkaline solution to obtain a suspension;

[0030] The metal salt is added dropwise into the suspension, followed by a hydrolysis reaction to obtain a hydrolysis reaction product, and the metal salt is zinc nitrate, zinc acetate, zinc chloride, cerium nitrate, cerium acetate, ferric chloride, ferric nitrate, nitric acid Cobalt, titanium tetrachloride or tetrabutyl titanate;

[0031] The hydrolysis reaction product is sequentially washed and vacuum-dried to obtain a graphite-phase carbon nitride nanosheet-based composite photocatalytic material precursor;

[0032] Calcining the graphite-phase carbon nitride nanosheet-based composite photocatalytic material precursor to obtain the graphite-phase carbon...

Embodiment 1

[0053] Put thiourea into a ceramic crucible and cover it, place it in a muffle furnace for calcination, heat it up to 600°C at a heating rate of 15°C / min and keep it for 4h to obtain a yellow powder sample, namely graphite phase carbon nitride. Add 1 g of graphitic carbon nitride into 100 mL of 6 mol / L potassium hydroxide solution, ultrasonically disperse, and gradually drop into 50 wt % ammonia solution until the pH is 13. Then, 0.5 g of titanium tetrachloride was gradually added while stirring until the precipitate appeared and kept for 0.5 h, washed with ethanol and deionized water several times respectively, and then vacuum-dried at 90° C. for 8 h. The dry precursor was calcined at 500°C for 2h, and the heating rate was 5°C / min, then the desired graphite-phase carbon nitride nanosheet-based composite photocatalytic material, that is, graphite-phase carbon nitride nanosheet / titanium dioxide composite Photocatalytic materials (two-dimensional carbon nitride / titanium dioxide)...

Embodiment 2

[0057] Put cyanuric chloride into a ceramic crucible and cover it, place it in a muffle furnace for calcination, heat it up to 560°C at a heating rate of 10°C / min and keep it warm for 5 hours to obtain a yellow powder sample, that is, graphite phase carbon nitride . Add 1 g of graphitic carbon nitride into 100 mL of 6 mol / L potassium hydroxide solution, ultrasonically disperse, and gradually drop into 50 wt % ammonia solution until the pH is 12. Then, 1 g of tetrabutyl titanate was gradually added while stirring, until the precipitate appeared and kept for 0.7 h, washed with ethanol and deionized water several times, and then vacuum-dried at 100° C. for 10 h. The dried precursor was calcined at 520°C for 4h with a heating rate of 15°C / min to obtain the desired graphitic carbon nitride nanosheet / titanium dioxide composite photocatalytic material. Titanium dioxide is evenly distributed on the surface of graphite phase carbon nitride nanosheets with layered structure, and the pa...

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Abstract

The invention provides a graphite-phase carbon nitride nanosheet-based compsite photocatalytic material as well as a preparation method and application thereof, which relates to the field of photocatalytic materials. A metal oxide semiconductor can uniformly cover the surface of a graphite-phase carbon nitride nanosheet by virtue of hydrolytic reaction and roasting of metal salts, so that the interaction between the graphite-phase carbon nitride nanosheet and metal oxide semiconductor interface can be adjusted. The interaction between the interfaces influences the transmission of charge carriers, the interface with close interaction can promote the charge transportation, so that the photocatalytic efficiency of the composite material can be improved. In the process that the metal oxide semiconductor is in-situ generated on the surface of carbon nitride, the blocky graphite-phase carbon nitride are converted into the graphite-phase carbon nitride nanosheet due to the heat etching effectin the calcining process, so that the specific surface area of a sample can be improved, the agglomeration of the particle-shaped oxide semiconductor particles can be prevented to certain extent, andthe metal oxide semiconductor can be uniformly dispersed on the surface of the graphite-phase carbon nitride nanosheet.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a graphite-phase carbon nitride nanosheet-based composite photocatalytic material and a preparation method and application thereof. Background technique [0002] The extensive use of fossil fuels and the aggravation of environmental pollution have prompted people to pay more attention to the development of renewable energy and technical research on environmental governance, how to efficiently convert inexhaustible and green and clean solar energy into practically applicable chemical energy , has been attracting the attention of researchers all over the world. Semiconductor photocatalysts that absorb visible light have shown great potential. The main principle of semiconductor photocatalysts is: when the energy of light irradiation is greater than the band gap of the semiconductor, that is, the band gap between the valence band and the conduction band,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F101/30
CPCC02F1/30B01J27/24C02F2305/10C02F2101/308B01J35/39B01J35/61
Inventor 余永志程思李小红余文林罗凌虹王乐莹徐序程亮
Owner JINGDEZHEN CERAMIC INSTITUTE
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