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Nitrogen doped graphene quantum dot/mesoporous titanium dioxide photocatalyst and preparation method thereof

A technology of graphene quantum dots and mesoporous titanium dioxide, which is applied in the field of energy and the environment, can solve problems such as reducing photocatalytic performance, and achieve the effect of improving photocatalytic efficiency and photocatalytic performance

Inactive Publication Date: 2017-03-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when titanium dioxide is excited by ultraviolet light, the generated photogenerated electrons and holes are easily recombined, thereby reducing the photocatalytic performance.

Method used

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  • Nitrogen doped graphene quantum dot/mesoporous titanium dioxide photocatalyst and preparation method thereof
  • Nitrogen doped graphene quantum dot/mesoporous titanium dioxide photocatalyst and preparation method thereof
  • Nitrogen doped graphene quantum dot/mesoporous titanium dioxide photocatalyst and preparation method thereof

Examples

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Embodiment 1

[0029] This embodiment provides a method for preparing a nitrogen-doped graphene quantum dot / mesoporous titanium dioxide photocatalyst, the specific steps are as follows:

[0030] 1) Add 0.23g of citric acid and 0.23g of thiourea (or 0.18g of urea) into an appropriate amount of deionized water, ultrasonically disperse the mixed solution and transfer it to a hydrothermal reactor, and react at 160°C for 4 hours; wash the product The nitrogen-doped graphene quantum dots can be obtained by drying.

[0031] 2) 2.648g hexadecylamine was dissolved in 400ml absolute ethanol solution and stirred. Then take 48 mg of nitrogen-doped graphene quantum dots obtained in step 1) and dissolve them in 1.60 ml of deionized water, ultrasonically add them to the above solution, and after stirring evenly, add 1.60 ml of potassium chloride solution (0.1 mol / L) and 8.8 ml of isopropyl titanate (95% pure), and then left to stand for 18 hours. The reaction solution is filtered and washed repeatedly wi...

Embodiment 2

[0041] This example is similar to Example 1, except that the mass of nitrogen-doped graphene quantum dots in Example 1 is 96 mg. During the preparation of titanium dioxide, it can be seen that the color of the upper layer solution is blue, indicating that there are nitrogen-doped graphene quantum dots dispersed in the solution. Miscellaneous graphene quantum dots, while the upper solution in Example 1 is colorless. After the test, it was found that the microstructure morphology of the prepared nitrogen-doped graphene quantum dot / mesoporous titanium dioxide photocatalyst was the same as in Example 1, and its photocatalytic performance was as follows: Figure 5 shown.

Embodiment 3

[0043]The present embodiment is similar to Example 1, except that the quality of nitrogen-doped graphene quantum dots in Example 1 is 24 mg. After the test, it is found that the prepared nitrogen-doped graphene quantum dots / mesoporous titanium dioxide photocatalyst The microstructure morphology is the same as that of Example 1, and its photocatalytic performance is as follows: Figure 5 shown.

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Abstract

The invention provides a nitrogen doped graphene quantum dot / mesoporous titanium dioxide photocatalyst and a preparation method thereof. According to the invention, nitrogen doped graphene quantum dots are distributed to the volume surface and the interior of titanium dioxide solid microspheres; the nitrogen doped graphene quantum dot / mesoporous titanium dioxide is of a spherical shape and has a diameter of 400 to 600 nm and a mesoporous structure; and the titanium dioxide is pure anatase type titanium dioxide. The preparation method provided by the invention comprises the following steps: synthesis of the nitrogen doped graphene quantum dots, and in-situ synthesis of the graphene quantum dot / mesoporous titanium dioxide by adopting a sol-gel method. According to the invention, the graphene quantum dots interact with a structure directing agent due to static electricity, and are gradually distributed to the volume surface and the interior of titanium dioxide microspheres with the structure directing agent in the hydrolysis process of a titanium source; and the graphene quantum dots are used as electron acceptors and transfersomes of the titanium dioxide, thereby enlarging the separation time of electrons and holes, and achieving the purpose of strengthening the photocatalytic performance of a material. The method provided by the invention has the advantages of simple operation, short synthesis period and easy control; and the hydrogen production rate of the material can reach 0.5 mmol<h-1>.

Description

technical field [0001] The invention relates to the fields of energy and environment, in particular to a nitrogen-doped graphene quantum dot / mesoporous titanium dioxide photocatalyst and a preparation method thereof. Background technique [0002] Titanium dioxide is an important semiconductor photocatalyst widely used in the degradation of organic dyes and photocatalytic water splitting. When the specific surface area of ​​titanium dioxide is increased, since the large specific surface area increases the effective chemical contact area between titanium dioxide molecules and adsorbed substances, more adsorbed molecules interact with titanium dioxide under light irradiation, thus enhancing the photocatalytic performance. This approach is mainly based on the P25 type commercial titanium dioxide powder produced by Degussa Company, which is the most widely used, and its specific surface area is 50 (± 15) m 2 / g; Second, through the preparation of mesoporous titanium dioxide mate...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/51B01J35/39
Inventor 田歌何莉卢毅阳晓宇
Owner WUHAN UNIV OF TECH
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