Preparation method and application of nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst

A technology of graphene quantum dots and nitrogen doping, which is applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen/synthesis gas production, etc. It can solve the problems of low utilization rate of visible light, low separation efficiency of photogenerated electrons and holes, etc. problem, to achieve the effect of improving photocatalytic performance, convenient separation and reuse, and wide visible light response range

Inactive Publication Date: 2018-07-27
JIANGSU UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] In order to solve the shortcomings of the binary composite photocatalyst prepared by the molten salt method in the prior art, which still have low separation efficiency of photogenerated electrons and holes, and low utilization rate of visible light, the present invention provides a nitrogen-doped graphene quantum Preparation method of dot / zinc oxide / carbon nitride composite visible light catalyst

Method used

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  • Preparation method and application of nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst
  • Preparation method and application of nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst
  • Preparation method and application of nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst

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Embodiment 1

[0029] Example 1: Preparation of nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst.

[0030] To the mixture of 1.0g cyanamide, 4.5g potassium chloride and 5.5g zinc chloride, 0.25mL 5.0mg / mL nitrogen-doped graphene quantum dot dispersion was added. The above mixture was ground and mixed in a mortar and transferred to a 50 mL crucible. The crucible was calcined in a muffle furnace: the heating rate was 2.1°C / min, the temperature was raised to 520°C and kept for 6 hours, and then the temperature was naturally cooled to room temperature. Wash the solid mixture in the crucible with a large amount of hot water (60-90°C), remove all the salt, and dry it in an oven at 60°C to obtain a nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst (20% yield).

[0031] The TEM spectrogram of gained doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst is as follows figure 1 ...

Embodiment 2

[0032] Example 2: Nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst.

[0033] To the mixture of 1.0g cyanamide, 4.5g potassium chloride and 5.5g zinc chloride, 0.25mL 5.0mg / mL nitrogen-doped graphene quantum dot dispersion was added. The above mixture was ground and mixed in a mortar and transferred to a 50 mL crucible. The crucible was calcined in a muffle furnace: the heating rate was 2.1 °C / min, the temperature was raised to 520 °C and kept for 4 hours, and then the temperature was naturally cooled to room temperature. Wash the solid mixture in the crucible with a large amount of hot water (60-90°C), remove all the salt, and dry it in an oven at 60°C to obtain a nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst (24% yield).

Embodiment 3

[0034] Example 3: Nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst.

[0035] To the mixture of 2.0g cyanamide, 4.5g potassium chloride and 5.5g zinc chloride, 0.5mL 5.0mg / mL nitrogen-doped graphene quantum dot dispersion was added. The above mixture was ground and mixed in a mortar and transferred to a 50 mL crucible. The crucible was calcined in a muffle furnace: the heating rate was 2.1 °C / min, the temperature was raised to 520 °C and kept for 4 hours, and then the temperature was naturally cooled to room temperature. Wash the solid mixture in the crucible with a large amount of hot water (60-90°C), remove all the salt, and dry it in an oven at 60°C to obtain a nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst (32% yield).

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Abstract

A preparation method of a nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst comprises the steps as follows: 1) a nitrogen-doped graphene quantum dot dispersion liquid, a precursor of carbon nitride and molten salt are mixed, and the obtained mixture is uniformly ground and transferred into a crucible; 2) the crucible containing the mixture is put in a muffle furnace, calcined in the air atmosphere and then naturally cooled to the room temperature; 3) the solid mixture in the crucible is washed with hot water at 60-90 DEG C, drying is performedafter salt is removed, and the nitrogen-doped graphene quantum dot/zinc oxide/carbon nitride composite visible light photocatalyst is obtained. The preparation method is quick and simple, raw materials are easy to obtain, the cost is low, the obtained visible light photocatalyst has higher crystallinity, larger specific surface area and wider visible light response range, can realize quick transfer and separation of photo-generated carriers, has the active hydrogen rate up to 68 mu mol/h during water splitting for hydrogen production with visible light and is 3.1 times that of a binary composite visible light photocatalyst (22 mu mol/h).

Description

technical field [0001] The invention belongs to the field of material preparation and photocatalysis technology, and relates to a nitrogen-doped graphene quantum dot / zinc oxide / carbon nitride composite visible light catalyst, its preparation method based on molten salt method, and its application in visible light catalytic hydrogen production use. Background technique [0002] Photocatalytic water splitting to produce hydrogen is an important way to convert solar energy into clean and usable chemical energy. In the past few decades, searching for highly efficient, stable, and visible-light-responsive photocatalysts has been a core issue in this field. In recent years, due to the graphitic carbon nitride (g-C 3 N 4 ) for its outstanding performance in splitting water to produce hydrogen under visible light, this polymer semiconductor photocatalyst has received extensive attention from scientific researchers. The characterization results prove that there are a large number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042C01B2203/0277C01B2203/1076Y02E60/36
Inventor 曹煜祺张慧谭宇烨
Owner JIANGSU UNIV OF TECH
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