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Preparation method of a nitrogen-containing carbon quantum dot/graphite phase carbon nitride composite photocatalyst

A technology of graphite phase carbon nitride and quantum dots, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and hydrogen production, to achieve good photocatalytic effects, overcome extraction and separation difficulties, and improve photocatalytic hydrogen production efficiency Effect

Active Publication Date: 2019-11-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Carbon quantum dots with semiconductor properties have the advantages of unique energy band structure, adjustable band gap, more sub-bands, strong visible light response ability, controllable particle size and environmental protection, etc., and can generate electron transfer under visible light excitation phenomenon, but the hydrogen production rate of pure carbon quantum dots photolysis of water is less than 50 μmol h -1 , relatively low

Method used

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  • Preparation method of a nitrogen-containing carbon quantum dot/graphite phase carbon nitride composite photocatalyst
  • Preparation method of a nitrogen-containing carbon quantum dot/graphite phase carbon nitride composite photocatalyst
  • Preparation method of a nitrogen-containing carbon quantum dot/graphite phase carbon nitride composite photocatalyst

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Embodiment 1

[0027] Preparation of composite photocatalyst with 5wt.% nitrogen-containing carbon quantum dots

[0028] (1) Preparation of nitrogen-containing carbon quantum dots

[0029] Under the protection of nitrogen atmosphere, according to the mass ratio of 5:1, glucose and glycine were evenly mixed and then placed in a sealed ball mill tank of a ball mill, mechanically ball milled at room temperature (25°C, the same below) for 4 hours, the speed was 580rpm, and the ball-to-material ratio was 20:1, the diameter of the agate ball used is 5mm;

[0030] After the ball milling is finished, the product is fully washed, high-speed centrifuged and dialyzed, the centrifugal speed is 10000rpm, and the dialyzed time is 3h, and then the obtained nitrogen-containing carbon quantum dot solution is rotated to evaporate the solvent to obtain nitrogen-containing carbon quantum dots;

[0031] The above-mentioned nitrogen-containing carbon quantum dots were refluxed in an excess of concentrated nitric...

Embodiment 2

[0036] Preparation of composite photocatalyst with 50wt.% mass percentage of nitrogen-containing carbon quantum dots

[0037] (1) Preparation of nitrogen-containing carbon quantum dots

[0038] Under the protection of nitrogen atmosphere, according to the mass ratio of 5:1, glucose and glycine were evenly mixed and then placed in a sealed ball mill jar of a ball mill, mechanically ball milled at room temperature (25°C, the same below) for 8 hours, the speed was 1000rpm, and the ball-to-material ratio was 60:1, the diameter of the agate ball used is 20mm;

[0039] After the ball milling is finished, the product is fully washed, high-speed centrifuged and dialyzed, the centrifugal speed is 30000rpm, and the dialyzed time is 20h, and then the obtained nitrogen-containing carbon quantum dot solution is rotated to evaporate the solvent to obtain nitrogen-containing carbon quantum dots;

[0040] The above-mentioned nitrogen-containing carbon quantum dots were refluxed for 10 h in a...

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Abstract

The invention belongs to the technical field of photocatalytic composite materials, and particularly relates to a preparation method of a nitrogen-containing carbon quantum dot / graphite phase carbon nitride composite photocatalyst: using glucose and glycine as carbon precursors and nitrogen precursors, and using a high-speed ball milling method to synthesize Nitrogen-containing carbon quantum dots; graphite-phase carbon nitride is prepared by hydrothermal method; using hydrophilic ionic liquid as solvent, nitrogen-containing carbon quantum dots and graphite-phase carbon nitride are combined through an acylation reaction to prepare nitrogen-containing carbon Quantum dot / graphite phase carbon nitride composite photocatalyst, nitrogen-containing carbon quantum dots and graphite phase carbon nitride are combined by covalent bonds.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic composite materials, in particular to a method for preparing a nitrogen-containing carbon quantum dot / graphite-phase carbon nitride composite photocatalyst. Background technique [0002] Photocatalytic water splitting for hydrogen production uses water as a raw material to convert inexhaustible solar energy into clean and high-density hydrogen energy, which can meet human energy needs without polluting the environment. It has become a solution to energy shortages and environmental pollution. One of the best methods, it has good potential in the field of new energy development. The photo-splitting of water to produce hydrogen is actually a catalytic reduction reaction that occurs on the surface of a semiconductor catalyst under photo-excitation, and the photo-generated electrons reduce water to produce hydrogen. [0003] The proportion of visible light in sunlight is about 43%. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J27/24B01J35/39Y02E60/36Y02P20/54
Inventor 许娟邬纯晶曹剑瑜陈智栋王文昌
Owner CHANGZHOU UNIV
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