Preparation method of composite material of graphene oxide and titanium oxide nano particles

A nanoparticle and composite material technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of easy agglomeration on the surface of titanium dioxide nanoparticles, reduced photocatalytic activity, and no obvious improvement. , to achieve excellent catalytic performance, improved photocatalytic efficiency, and simple steps.

Active Publication Date: 2013-06-12
JILIN UNIV
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Problems solved by technology

[0003] As a commonly used photocatalyst, titanium dioxide has the characteristics of strong oxidation ability, high stability, low cost, non-toxicity, and large specific surface area. However, the surface of titanium dioxide nanoparticles is easy to agglomerate, resulting in a decrease in photocatalytic activity.
However, there is still no significant improvement in the aspect of narrow photoresponse range, and the degradation of dyes still needs to be achieved under certain ultraviolet light conditions.

Method used

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  • Preparation method of composite material of graphene oxide and titanium oxide nano particles
  • Preparation method of composite material of graphene oxide and titanium oxide nano particles
  • Preparation method of composite material of graphene oxide and titanium oxide nano particles

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Weigh 2g of graphite powder, add 1.5g of sodium nitrate into the Erlenmeyer flask and mix, add 67.5ml of concentrated sulfuric acid and place it on a magnetic stirrer for stirring. Under ice-bath conditions, gradually add 9 g of potassium permanganate for about 1 hour, take it out after stirring for 2 hours under ice-bath conditions, and stir at room temperature for 5 days.

[0035] 2) Add 200ml of sulfuric acid with a mass fraction of 5% to the Erlenmeyer flask dropwise, and stir for 2 hours. After adding 6ml of hydrogen peroxide dropwise into the Erlenmeyer flask, the color of the solution turned bright yellow, and stirred for 2 hours.

[0036] 3) Take the upper liquid and centrifuge, wash with a mixed solution of sulfuric acid with a mass fraction of 3% and hydrogen peroxide with a mass fraction of 10.5% until the pH is neutral, put the obtained precipitate in a vacuum drying oven, and dry at 80°C for 24 hours, that is Get graphite oxide.

[0037] 4) The mass of...

Embodiment 2

[0043] Embodiment 1 step 5) reaction temperature is changed to 150 DEG C, all the other steps are identical with embodiment 1, test sampling and test process are the same as embodiment 1 step 7), the photocatalytic efficiency of result graphene oxide and titanium dioxide nano particle composite material and Titanium dioxide P25 is close, and the dye can be degraded by 50% under no-light conditions. After continuing to increase ultraviolet radiation, the dye can be further degraded.

Embodiment 3

[0045] Embodiment 1 step 5) reaction temperature is changed to 120 ℃, all the other steps are the same as embodiment 1, and the obtained graphene oxide and titanium dioxide nanoparticle composite material is subjected to scanning electron microscope observation, and the results are shown in figure 2 . From figure 2 The morphology of the prepared graphene oxide and titanium dioxide nanoparticle composite sample can be seen. It can be seen that the titanium dioxide nanoparticles are mainly dispersed to the edges and folds of graphene oxide, and the size of graphene oxide is about 500nm. According to the test sampling and testing process of step 7) in Example 1, the photocatalytic efficiency of the composite material of graphene oxide and titanium dioxide nanoparticles has been improved by 60% compared with P25, and the dye can be degraded even under the condition of no light completely.

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Abstract

The invention provides a preparation method of a composite material of graphene oxide and titanium oxide nano particles, and belongs to the technical field of preparation methods of catalysts for catalytically degrading a dye. The preparation method comprises the following steps of: dissolving graphite oxide into the water and ultrasonically oscillating; adding titanium dioxide and mixing under stirring; pouring suspension liquid into a teflon bush of a hydrothermal reaction kettle and sealing; reacting for some time while adjusting and controlling the reaction time and the reaction temperature of the hydrothermal method; cooling to the room temperature after the reaction; centrifugally washing the suspension liquid in the telfon bush; and drying the precipitate to obtain the composite material of graphene oxide and titanium dioxide. According to the preparation method of the composite material of graphene oxide and the titanium oxide nano particles, no additives are added, so that the environment is protected, the amount of introduced impurities is decreased, and the deposition or attaching performance of the titanium dioxide nano particles on a graphene oxide substrate is improved; the product is excellent in catalytic performance and can degrade the dye even in a dark condition; and the preparation method is lower in cost, simple and easy in operation, high in stability and repeatability, and suitable for massive production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation methods for catalytic degradation of dyes, in particular to a preparation method of graphene oxide and titanium dioxide nanoparticle composite materials, especially a preparation of a catalyst capable of catalytic degradation of dyes under dark conditions method. Background technique [0002] With the continuous development of human society, environmental issues have gradually become an important aspect that experts and scholars from all over the world pay close attention to, especially the issue of dye wastewater. Due to the high chroma, complex composition, high toxicity and strong pollution of dye wastewater, it is difficult to be completely degraded. However, the photocatalytic degradation method gradually developed in recent years has attracted the attention of scholars and experts from various countries because of its advantages of fast speed, complete degradation, and non-sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
Inventor 田宏伟郑伟涛金春吉
Owner JILIN UNIV
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