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Synthesis method of large-area two-dimensional composite nano-material

A composite nanomaterial and a synthesis method technology are applied in the field of synthesis of large-area two-dimensional composite nanomaterials, can solve problems such as influence on use, etc., and achieve the effects of simple operation, excellent photocatalytic degradation of organic matter and photocatalytic hydrogen production, and low cost of raw materials

Inactive Publication Date: 2016-08-17
HUAIBEI NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, its carriers are easy to recombine, which greatly affects its use in the field of photocatalysis.

Method used

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  • Synthesis method of large-area two-dimensional composite nano-material

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Embodiment 1

[0019] A method for synthesizing large-area two-dimensional composite nanomaterials. First, thermally decompose amine precursors. The temperature of thermal decomposition is 400-700° C., and the heating time is 1-12 hours to synthesize C 3 N 4 nanosheets; the synthesized C 3 N 4 Nanosheets, amine solvents, cadmium salts, sulfur salts are mixed with water, stirred and ultrasonically dispersed to make them fully dispersed, heated and reacted, and centrifuged; the temperature of the heating reaction is 120-220°C, and the heating time is 6-6 48 hours; the rotational speed of the centrifuge is 100-14000 rpm until the pH of the product is neutral.

[0020] The mass volume ratio of the amine precursor to the amine solvent is 1 to 60:2 to 100; the volume ratio of the water to the amine solvent is 1:0.8 to 3; the added amount of the cadmium salt is 0.01 to 2.5 mol / L, the amount of sulfur salt added is 0.01~2.5mol / L.

[0021] The amine precursor is one or more combinations of melami...

Embodiment 2

[0026] 30g of melamine was heated and decomposed at 600°C for 4 hours to synthesize C 3 N 4 nanosheets; then the C 3 N 4 Nanosheets, 20mL diethylenetriamine, 0.05mol / L cadmium nitrate, 0.05mol / L sulfur powder and 20mL water were mixed, stirred for 30 minutes, ultrasonicated for 30 minutes to fully disperse, heated at 150°C for 10 hours, and centrifuged to obtain Large-area two-dimensional composite nanomaterials.

[0027] Its TEM spectrum is as figure 1 As shown, the hydrogen production can reach 123 μmol each time the total volume of the system is 10ml.

Embodiment 3

[0029] Heat and decompose 50g of urea at 550℃ for 6 hours to synthesize 3 N 4 nanosheets; then the C 3 N 4 Nanosheets, 30mL triethylenetetramine, 0.1mol / L cadmium nitrate, 0.15mol / L dithizone and 10mL water were mixed, stirred for 30 minutes, ultrasonicated for 50 minutes to fully disperse, heated at 160°C for 12 hours, centrifuged Obtain large-area two-dimensional composite nanomaterials.

[0030] The hydrogen production can reach 148 μmol each time based on the total volume of the system being 10ml.

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Abstract

The invention discloses a synthesis method of a large-area two-dimensional composite nano-material. Firstly, an amine precursor is subjected to heating decomposition, and C3N4 nano sheets are synthesized; then, the synthesized C3N4 nano sheets, an amine solvent, cadmium salt and sulphonium salt are mixed with water, stirring and ultrasonic treatment are performed to make the mixture fully dispersed, and the large-area two-dimensional composite nano-material is obtained through heating reaction after centrifugation. According to the synthesis method, CdS nano sheets and the C3N4 nano sheets are compounded, the special two-dimensional composite material has a large-area contact interface and is advantageous to current carrier separation, the CdS nano sheets are matched with the C3N4 nano sheets in a band gap mode, the photocatalytic activity of the composite material is improved, and the composite material has excellent photocatalytic organic-matter degradation performance and photocatalytic hydrogen generation performance and is good in repeating performance and long in cyclic service life. The raw materials are low in cost, and the synthesis method is simple and convenient to operate and high in yield and has wide industrialization prospect.

Description

technical field [0001] The invention relates to a method for synthesizing large-area two-dimensional composite nanomaterials, which belongs to the technical fields of energy environment and nanomaterials. Background technique [0002] Energy and environmental issues have become the subjects that restrict the sustainable development of human beings. Using solar energy to produce hydrogen from water is the most attractive route to solve today's energy shortage and environmental pollution. 3 / 4 of our earth is covered by water, which contains abundant hydrogen sources. Hydrogen energy is regarded as the most ideal substitute energy for petroleum, coal and other non-renewable energy because of its cleanness, pollution-free, high calorific value and convenient storage and transportation. At the same time, hydrogen is the most basic raw material of modern chemical industry. Among them, the photocatalytic water splitting technology for hydrogen production is the best way for photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C01B3/04
CPCC01B3/04B01J27/24C01B2203/1088B01J35/60B01J35/39Y02E60/36
Inventor 代凯吕佳丽梁长浩李栋佩王中辽李真
Owner HUAIBEI NORMAL UNIVERSITY
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