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A kind of graphene/titanium dioxide composite material and its preparation method and application

A technology of titanium dioxide and composite materials, applied in the application field of air purification, can solve the problems of reducing the photocatalytic efficiency of composite materials, unable to fully exert adsorption performance, and less research on adsorption and degradation, so as to improve the photocatalytic activity and inhibit the composite material. rate, the effect of increasing the local gas concentration

Active Publication Date: 2020-11-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, in the reported composite materials, graphene is completely wrapped by titanium oxide, the surface interface effect is affected, and the adsorption performance cannot be fully exerted; the interface bridging method using a linker affects the charge transfer between materials to a certain extent. None of the graphene / titanium oxide composite materials can meet the purpose of optimizing the interface contact and adsorption effect at the same time, which greatly reduces the photocatalytic efficiency of the composite material in practical application.
In addition, the current related research on the application of graphene / titanium oxide materials mostly focuses on the degradation of liquid-phase pollutants and the degradation of stationary-phase polluted gases. The research on the adsorption and degradation of mobile-phase polluted gases, especially low-concentration gaseous organic pollutants, is relatively limited. few

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  • A kind of graphene/titanium dioxide composite material and its preparation method and application
  • A kind of graphene/titanium dioxide composite material and its preparation method and application
  • A kind of graphene/titanium dioxide composite material and its preparation method and application

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preparation example Construction

[0059] Preparation of Amorphous Titanium Oxide. In one example, amorphous titanium oxide is prepared by liquid phase hydrolysis. Dissolve the organic titanium source in a mixed solution of absolute ethanol and water (preferably deionized water), mix well and continue to react at a certain temperature for a period of time, and then undergo solid-liquid separation (such as centrifugation), washing, and drying to obtain amorphous Titanium oxide particles. The organic titanium source can be at least one of titanium isopropoxide and tetrabutyl titanate. Compared with inorganic titanium sources, organic titanium sources have mild experimental conditions and high experimental safety. The mass ratio of the organic titanium source, absolute ethanol and water can be (1-5): (300-500): (3-10). Under this reaction ratio, the hydrolysis rate of the titanium source is moderate, which is helpful to obtain granular Titanium oxide particles with a diameter of 3 to 50 nm. The reaction temper...

Embodiment 1

[0071] First, 5 g of tetrabutyl titanate was dissolved in 500 g of absolute ethanol, and 4 g of deionized water was added dropwise while stirring, and then placed in an oil bath at 80° C. for 5 hours under reflux. After the resulting product was centrifuged, it was washed three times with ethanol and three times with distilled water to obtain amorphous titanium oxide, which was obtained from the Raman spectrum image 3 It can be seen that titanium oxide is not crystallized and is in an amorphous state. Then the above product was dispersed in 50ml H with 1.46mg graphene oxide 2 Dilute sulfuric acid was added dropwise to the mixed solution of O and 25ml ethanol to adjust the pH to 4. After ultrasonication for 1 hour and stirring for 5 hours, the solution was placed in a hydrothermal kettle for hydrothermal reaction at 150°C for 6 hours. The final product was washed with deionized water and then dried at 50° C. for 2 hours to obtain a graphene / titanium dioxide composite material...

Embodiment 2

[0075] First, 5 g of tetrabutyl titanate was dissolved in 500 g of absolute ethanol, and 4 g of deionized water was added dropwise while stirring, and then placed in an oil bath at 80° C. for 5 hours under reflux. After the obtained product was centrifuged, it was washed three times with ethanol and three times with distilled water to obtain amorphous titanium oxide. Then the above product was dispersed in 50mlH with 5.84mg graphene oxide 2 To the mixed solution of O and 25ml ethanol, dilute sulfuric acid was added dropwise to adjust the pH to 4. After ultrasonication for 1 hour and stirring for 5 hours, the solution was placed in a hydrothermal kettle and reacted at 150°C for 6 hours. The final product was washed with deionized water and then dried at 50° C. for 2 hours to obtain a graphene / titanium dioxide composite material powder, wherein the weight ratio of graphene was 0.5%. The obtained graphene / titanium dioxide composite material includes graphene and titanium dioxide...

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Abstract

The invention relates to a graphene / titanium dioxide composite material and its preparation method and application. Graphene / titanium dioxide composite materials include: graphene, and titanium dioxide particles closely adhered to the graphene sheets. The present invention selects graphene and titanium dioxide to be composited to obtain a high-efficiency photocatalyst that has the excellent properties of both graphene and titanium oxide.

Description

technical field [0001] The invention relates to a nanocomposite material, a preparation method thereof and a method for degrading low-concentration organic pollutant gases in the air, belonging to the application in the field of air purification. Background technique [0002] In recent years, the problem of air pollution has become increasingly serious, affecting people's life and health. Among them, nitrogen oxides, sulfur oxides, volatile organic pollutants (VOC S ) is the main pollutant. Long-term exposure to this pollutant gas will cause a series of diseases such as respiratory diseases, allergic diseases, skin diseases, cancer, etc., so it is of great value for the research of air purification technology and the development of high-performance materials (refer to literature 1). Photocatalytic technology is a green and environmentally friendly air purification technology, which can degrade NOx, SOx, VOCs and other gas phase organic pollutants under sunlight. Due to it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J21/20B01D53/00B01D53/72B01D53/86
CPCB01D53/007B01D53/8668B01J21/063B01J21/18B01J21/20B01D2259/804B01D2257/7027B01D2257/70B01J35/396B01J35/393B01J35/39
Inventor 孙静林文娇谢晓峰王焱王晓陆冠宏胡译丹曾庆龙
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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