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Graphene oxide/titanium dioxide-active carbon three-dimensional composite material and preparation method thereof

A composite material and titanium dioxide technology, which is applied in the field of air purification, can solve the problems of easy recombination collision probability of electron holes, slow catalytic reaction rate of composite materials, hindering electron conduction, etc., so as to reduce the risk of secondary pollution, reduce the phenomenon of agglomeration, Reduce the effect of compounding

Active Publication Date: 2017-11-21
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, there are still disadvantages of easy recombination of electrons and holes and low probability of collision between titanium dioxide and toxic gas molecules, resulting in low photocatalytic efficiency.
In addition, the photocatalytic purification process requires the ultraviolet lamp to be turned on constantly, which is not conducive to human health
[0004] In patent CN105642248A, a preparation method of formaldehyde composite filter screen composite material for air purifiers is introduced, which uses a crosslinking agent to paste titanium dioxide and poly-1,4-diphenylbutadiyne on activated carbon to achieve the purification effect. The use of cross-linking agents in this method hinders the conduction of electrons, resulting in a slow catalytic reaction rate of the prepared composites.

Method used

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  • Graphene oxide/titanium dioxide-active carbon three-dimensional composite material and preparation method thereof
  • Graphene oxide/titanium dioxide-active carbon three-dimensional composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Preparation of graphene oxide / titanium dioxide-activated carbon three-dimensional composite material, the steps are as follows:

[0026] Weighing 12 mg of graphene oxide was slowly added to a stirred solution of 100 mL of water and 20 mL of ethanol, ultrasonically treated for half an hour, and then stirred for half an hour to fully mix to obtain a graphene oxide dispersion.

[0027] Slowly add 1.2g of mixed crystal titanium dioxide with a particle size of 5nm to the above-mentioned graphene oxide dispersion in a stirred state, stir for 1 hour and then perform ultrasonication for 1 hour. This process is repeated twice to obtain a uniformly dispersed mixture. liquid; pour the resulting mixed solution into a high-pressure reactor containing tetrafluoroethylene lining, put it into an environment of 100 ° C for 1 hour, take it out, and naturally cool it to room temperature to obtain a graphene oxide / titanium dioxide composite material. Suspension, ready to use.

[0028] Cut...

Embodiment 2

[0031] Preparation of graphene oxide / titanium dioxide-activated carbon three-dimensional composite material, the steps are as follows:

[0032] Weigh 100 mg of graphene oxide and slowly add it to a solution of 20 mL of water and 100 mL of ethanol under stirring, ultrasonically treat it at a frequency of 100 Hz for half an hour, and then stir for half an hour to fully mix it to obtain graphene oxide Dispersions.

[0033] Slowly add 10g of mixed crystal titanium dioxide with a particle size of about 50nm into the graphene oxide dispersion under stirring, stir for half an hour and then ultrasonicate for half an hour. Repeat this process twice to obtain a uniformly dispersed mixed solution Pour the resulting mixed solution into a high-pressure reactor containing tetrafluoroethylene lining, put it into a 200°C environment for 8 hours, take it out, and cool it to room temperature naturally to obtain a suspension containing graphene oxide / titanium dioxide composite material. Turbid ...

Embodiment 3

[0037] Preparation of graphene oxide / titanium dioxide-activated carbon three-dimensional composite material, the steps are as follows:

[0038] Weigh 30mg of graphene oxide and slowly add it to a solution of 60mL of water and 20mL of ethanol in a stirring state, ultrasonically treat it at a frequency of 100Hz for half an hour, and then stir for half an hour to make it fully mixed to obtain a graphene oxide dispersion. liquid.

[0039]Slowly add 1.6g of mixed crystal titanium dioxide with a particle size of about 21nm to the above-mentioned graphene oxide dispersion in a stirred state, stir for half an hour and then ultrasonicate for half an hour. Repeat this process twice to obtain a uniformly dispersed Mixed solution: Pour the obtained mixed solution into a high-pressure reactor with a tetrafluoroethylene liner, put it in an environment of 150 ° C for 5 hours, take it out, and naturally cool it to room temperature to obtain a graphene oxide / titanium dioxide composite material...

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Abstract

The present invention belongs to the technical field of air purification, and particularly relates to a graphene oxide / titanium dioxide-active carbon three-dimensional composite material and a preparation method thereof, wherein a graphene oxide / titanium dioxide composite material is directly and densely adhered onto the surface of an active carbon filtration screen or a carbon fiber net so as to obtain the three-dimensional composite material. According to the present invention, the graphene oxide / titanium dioxide-active carbon three-dimensional composite material can provide excellent adsorption performance and excellent photocatalytic degradation performance on formaldehyde, wherein photocatalytic degradation is performed after formaldehyde is adsorbed, such that the actual removal of the formaldehyde can be achieved, and the secondary pollution caused by the desorption of the formaldehyde can be prevented; and after the adsorption degradation treatment is performed with the composite material of the present invention, the removal rate of the low concentration formaldehyde (concentration of 1.0 mg / m<3>) in the home within 10 h is up to 82.5-95.6%.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a graphene oxide / titanium dioxide-activated carbon three-dimensional composite material and a preparation method thereof. Background technique [0002] With the development of society, people's requirements for the quality of living environment are also increasing. How to effectively remove harmful gases in the air, especially formaldehyde, has become a research hotspot. At present, the commonly used formaldehyde removal method is to use porous carbon materials such as activated carbon for adsorption. This method has the disadvantages that formaldehyde cannot be completely removed, it will be inactivated after being placed until the adsorption is saturated, and the high concentration of formaldehyde on the surface of the activated carbon material will cause desorption and release of formaldehyde. Secondary pollution etc. [0003] Photocatalytic purification ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01D53/86B01D53/72B82Y30/00B82Y40/00
CPCB01D53/8668B82Y30/00B82Y40/00B01J21/18B01D2257/708B01J35/39
Inventor 陈金伟罗瑞杨昊崴王瑞林范国强张敏王刚
Owner SICHUAN UNIV
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