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Graphene/titanium dioxide composite material, preparation method and application thereof

A technology of titanium dioxide and composite materials, which is applied in the field of air purification, can solve the problems of reducing the photocatalytic efficiency of composite materials, not being able to fully exert the adsorption performance, and less research on adsorption and degradation, so as to improve photocatalytic activity and inhibit composite materials. The effect of increasing the local gas concentration

Active Publication Date: 2018-06-15
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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  • Graphene/titanium dioxide composite material, preparation method and application thereof
  • Graphene/titanium dioxide composite material, preparation method and application thereof
  • Graphene/titanium dioxide composite material, preparation method and application thereof

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preparation example Construction

[0058] 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, the experimental conditions of organic titanium sources are mild, and the experiment safety is high. 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 helps to obtain granular Titanium oxide particles with a diameter of 3 to 50 nm. The reaction...

Embodiment 5

[0065] In one example, the above-mentioned coating was tested for photocatalytic degradation of low-concentration flowing adjacent xylene and acetaldehyde gas under low-power ultraviolet light. The concentrations of o-xylene and acetaldehyde gas are both 25ppm. The ultraviolet light illumination condition can be 250W xenon lamp. The distance between the xenon lamp and the composite material is 35 cm. The ultraviolet photodegradation efficiency of the graphene / titanium dioxide composite material prepared by the invention can be 20% to 90% for o-xylene gas. The ultraviolet light degradation efficiency of acetaldehyde gas can be 20% to 90%. See respectively Figure 5 with Image 6 It can be seen that for the graphene / titanium dioxide composite material obtained by the above method, for the degradation of low-concentration gaseous acetaldehyde under the condition of 250W xenon lamp, the photocatalytic activity of Example 6 (rGO wt%=0.5%) is relatively higher than that of other...

Embodiment 1

[0070] 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 80°C oil bath to reflux for 5 hours. 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 above-mentioned product is dispersed in 50ml H together with 1.46mg graphene oxide 2 Dilute sulfuric acid was added dropwise to the mixed solution of O and 25ml of 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 m...

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Abstract

The invention relates to a graphene / titanium dioxide composite material, a preparation method and application thereof. The graphene / titanium dioxide composite material comprises: graphene and titaniumdioxide particles closely attached to the graphene sheet. According to the invention, graphene and titanium dioxide are selected for compounding to obtain an efficient photocatalyst with the excellent properties of graphene and titanium oxide simultaneously.

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, which belong 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 polluting 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...

Claims

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Application Information

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Patent Type & Authority Applications(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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