Carbon nitride and graphene composite material modified by organic dye and application of carbon nitride and graphene composite material

A technology of organic dyes and composite materials, applied in organic dye-modified carbon nitride graphene composite materials and its application fields, can solve the problems of small specific surface area and low quantum efficiency of graphite phase carbon nitride, and achieve simple and easy preparation methods Line, simple equipment, high effect than the surface

Active Publication Date: 2018-02-02
ZHEJIANG UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is: to overcome the present massive g-C 3 N 4 Graphite phase carbon nitride has problems such as small specific surface area, severe photogenerated electron-hole recombination, and low quantum efficiency. A dye-modified carbon nitride / reduced graphene composite material is provided for visible light catalytic reduction of carbon dioxide to methanol fuel

Method used

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  • Carbon nitride and graphene composite material modified by organic dye and application of carbon nitride and graphene composite material
  • Carbon nitride and graphene composite material modified by organic dye and application of carbon nitride and graphene composite material
  • Carbon nitride and graphene composite material modified by organic dye and application of carbon nitride and graphene composite material

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Experimental program
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Effect test

Embodiment 1

[0029] 1. g-C 3 N 4 preparation

[0030] Take 20g of dipolycyanamide into a 50ml crucible, cover it with a lid, put it into a muffle furnace, raise the temperature from room temperature to 550°C at a heating rate of 2.2°C, keep the temperature at 550°C for 4 hours, and cool down to room temperature to obtain a yellow color Sample block g-C 3 N 4 8g, grind into powder with a mortar and set aside, for g-C 3 N 4 Samples were characterized by X-ray diffraction ( figure 1 ), the characteristic peaks 003 and 002 appear at 13.3° and 27.1°, respectively.

[0031] 2. g-C 3 N 4 Ball milling pretreatment:

[0032] 1.0g of g-C 3 N 4 The powder and 100 mL of 2mol / L NaOH aqueous solution were loaded into a ball mill bowl with steel balls with a diameter of 8 mm, and the steel balls were mixed with g-C 3 N 4 The mass ratio is 50:1, the rotational speed is 100rpm, and the ball mill is 72 hours. The steel balls are separated to obtain a black suspension, and the black precipitat...

Embodiment 2

[0037] 1. g-C 3 N 4 Ball milling pretreatment:

[0038] 1.0 g of g-C prepared in Example 1 3 N 4 The powder and 100 mL, 3 mol / L KOH aqueous solution were loaded into a ball mill bowl with steel balls with a diameter of 8 mm, and the steel balls were mixed with g-C 3 N 4 The mass ratio is 400:1, the rotational speed is 600rpm, ball milling for 2 hours, the steel balls are separated to obtain a black suspension, 3000rpm centrifugation to obtain a black precipitate, add 100ml, 0.5mol / L hydrochloric acid aqueous solution and stir magnetically at 90°C for 72h to remove the impurity Fe, Then centrifuged and washed repeatedly with deionized water until pH = 7, and the precipitate was freeze-dried at -50°C for 72 hours to obtain 0.7 g of nitrogen yellow product, which was g-C after ball milling. 3 N 4 . The resulting product was characterized by X-ray diffraction, and with block g-C 3 N 4 For comparison, it can be seen that the 002 peak of the sample after ball milling decrea...

Embodiment 3

[0042] 1. g-C 3 N 4 Ball milling pretreatment:

[0043] 1.0 g of g-C prepared in Example 1 3 N 4 The powder and 100 mL of 1 mol / L NaOH aqueous solution were loaded into a ball mill bowl with steel balls with a diameter of 8 mm, and the steel balls were mixed with g-C 3 N 4 The mass ratio is 200:1, the speed is 400rpm, ball milling is 24 hours, the steel balls are separated to obtain a black suspension, 3000rpm is centrifuged to obtain a black precipitate, and 100ml of 0.5mol / L hydrochloric acid solution is added to magnetically stir at 50°C for 48h to remove the impurity Fe, and then Centrifuge and wash repeatedly with deionized water until pH = 7, and obtain a precipitate. Freeze-dry at -55°C for 48 hours to obtain 0.9 g of nitrogen yellow product, which is g-C after ball milling. 3 N 4 . The resulting product was characterized by X-ray diffraction, and the bulk g-C 3 N 4 For comparison, it can be seen that the 002 peak of the sample after ball milling decreased sign...

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Abstract

The invention discloses a carbon nitride and graphene composite material modified by organic dye. A method for preparing the carbon nitride and graphene composite material includes ultrasonically uniformly mixing g-C3N4 alcoholic solution and graphene alcoholic solution with each other, keeping the temperature of 100-240 DEG C constant for 8-24 h, centrifugally removing ethyl alcohol and carryingout vacuum drying on obtained precipitates to obtain g-C3N4/r-graphene compositions; ultrasonically uniformly mixing the g-C3N4/r-graphene compositions, the organic dye and organic alcohol C with oneanother, carrying out centrifuging, washing precipitates by the aid of organic alcohol C and then drying the precipitates under dark conditions to obtain the carbon nitride and graphene composite material modified by the organic dye. The carbon nitride and graphene composite material has the advantages that the carbon nitride and graphene composite material is provided with mesoporous structures and has large specific surface areas, the hole-charge separation speeds, the light absorption rate and the light utilization rate can be increased, the photocatalytic performance of the carbon nitrideand graphene composite material is higher than 8 times the photocatalytic performance of graphite-phase carbon nitride if the carbon nitride and graphene composite material is used for carrying out reduction on carbon dioxide and water vapor in visible light to obtain methanol.

Description

(1) Technical field [0001] The invention relates to the synthesis of carbon dioxide photocatalyst, which is a catalyst for modifying carbon nitride / reduced graphene with dye, and its application for photocatalytic synthesis of methanol. (2) Background technology [0002] With the consumption of various fossil fuels, atmospheric carbon dioxide (CO 2 ) Excessive emissions aggravate the greenhouse effect. But at the same time, carbon dioxide has become the most extensive and cheapest carbon source in the world. In this context, exploring the rational use of CO 2 It has become an important research topic at home and abroad. Using inexhaustible solar energy to simulate plant photosynthesis, CO 2 Photocatalytic reduction to hydrocarbons (such as methane, methanol, etc.) is a green synthesis technology. Methanol is not only a basic raw material for the synthesis of various organic compounds, but also a sustainable and clean green fuel. Therefore, the study of photocatalytic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J31/02B01J35/10B01J37/08B01J37/10C07C31/04C07C29/159
CPCB01J27/24B01J31/0225B01J31/0271B01J31/0279B01J31/0289B01J35/004B01J35/1019B01J37/0036B01J37/082B01J37/10B01J2231/62C07C29/159Y02P20/52
Inventor 陈爱民陈琦彭晓
Owner ZHEJIANG UNIV OF TECH
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