Preparation method for blue sheet-like titanium dioxide nanomaterial

A titanium dioxide and nanomaterial technology, applied in the field of nanomaterials and photocatalysis, can solve the problems of low utilization rate and difficult absorption of visible light, and achieve the effects of low equipment requirements, simple operation, and improved absorption and utilization rate.

Inactive Publication Date: 2013-01-30
NANJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of blue flaky titanium dioxide nanomaterials in order to enhance the absorption of visible light and make full use of solar energy, thereby alleviating the world's energy and environmental problems; mainly by modifying titanium dioxide to make its color It changes from white to blue and forms a flake shape at the same time, thus overcoming the problems of titanium dioxide's difficulty in absorbing visible light and low utilization rate

Method used

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  • Preparation method for blue sheet-like titanium dioxide nanomaterial
  • Preparation method for blue sheet-like titanium dioxide nanomaterial
  • Preparation method for blue sheet-like titanium dioxide nanomaterial

Examples

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example 1

[0021] Sample T 0 Preparation: Add 100ml of butanol and 20ml of tetrabutyl titanate into a plastic beaker, stir well to obtain solution A. Then, 1.0ml of 50% hydrofluoric acid was added dropwise to solution A, and stirred to obtain clear solution B. Solution B was moved to the reactor, and reacted at 180° C. for 30 h. Cool naturally (blue precipitate), wash with ethanol and centrifuge 3 times, dry, and finally get the blue flaky anatase titanium dioxide sample T 0 . Dissolve the sample in ethanol, and the photo of its dispersion in ethanol is shown in figure 1 As shown in the upper right inset, it is blue; it can be seen that the sample T 0 Anatase titanium dioxide (see figure 1 ), the grain size is 16nm, and the morphology is flake (see Figure 2-3 ), can absorb visible light from 400nm to 700nm (see Figure 4 ). The sample T 0 The degradation rate of methylene blue under visible light is 95.1%, which is better than commercial P25 (75.3%) (see Figure 5 ).

example 2

[0023] Sample T 1 Preparation: Add 80ml of propanol and 20ml of isopropyl titanate into a plastic beaker, stir well to obtain solution A. Then, 3.6ml of 40% hydrofluoric acid was added dropwise to solution A, and stirred to obtain clear solution B. Solution B was moved to the reactor, and reacted for 12h at 100°C. Cool naturally (blue precipitate), wash with ethanol and centrifuge 3 times, dry, and finally get the blue flaky anatase titanium dioxide sample T 1 . Dissolve the sample in ethanol, and the photo of its dispersion in ethanol is shown in Figure 6 As shown in the upper right inset, it is blue; known sample T 1 Anatase titanium dioxide (see Figure 6 ), the grain size is 14nm, and the morphology is flake (see Figure 7 ), can absorb visible light from 400nm to 700nm. The sample T 1 The degradation rate of methylene blue under visible light is 96.7%, which is better than commercial P25 (74.6%).

example 3

[0025] Sample T 2 Preparation: Add 50ml of ethanol and 20ml of tetrabutyl titanate into a plastic beaker, stir well to obtain solution A. Then, 5.0ml of 30% hydrofluoric acid was added dropwise to solution A, and stirred to obtain clear solution B. Solution B was moved to the reactor, and reacted for 60h at 200°C. Cool naturally (blue precipitate), wash with ethanol and centrifuge 3 times, dry, and finally get the blue flaky anatase titanium dioxide sample T 2 . Dissolve the sample in ethanol, and the photo of its dispersion in ethanol is shown in Figure 8 As shown in the upper right inset, it is blue; it can be seen that the sample T 2 Anatase titanium dioxide (see Figure 8 ), the grain size is 28nm, and the morphology is flake (see Figure 9 ), can absorb visible light from 400nm to 700nm. The sample T 2 The degradation rate of methylene blue under visible light is 96.2%, which is better than commercial P25 (74.7%).

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Abstract

The invention relates to a preparation method for a blue sheet-like titanium dioxide nanomaterial. The preparation method comprises the following specific steps of: dispersing a titanium source in a solvent; then, adding a morphology control agent; stirring to obtain transparent solution; then, transferring the transparent solution into a reaction kettle for reaction; naturally cooling; washing; centrifuging; and drying to finally obtain the blue sheet-like titanium dioxide nanomaterial. The grain size of the material is 10-30nm; the crystal form of the material is an anatase form; and 400-700nm visible light can be absorbed. The blue sheet-like titanium dioxide nanomaterial prepared by the preparation method has the characteristics that the raw material is broad in source; the preparation method is simple; and the material is controllable in color and adjustable in morphology. One more breakthrough that the titanium dioxide nanomaterial is colored from white is realized. The blue sheet-like titanium dioxide nanomaterial is expected to be applied to the sewage treatment industry.

Description

technical field [0001] The invention relates to a preparation method of a blue sheet-like titanium dioxide nanometer material, which belongs to the technical field of nanomaterials and photocatalysis. Background technique [0002] Titanium dioxide (TiO 2 ) is a very important transition metal oxide, which has the advantages of non-toxicity, strong oxidation ability, good stability and reusability, and is widely used in industries such as coatings, paints, toothpaste and cosmetics. In 1972, Fujishima, a professor at the University of Tokyo in Japan, discovered the phenomenon of photolysis of water on a titanium dioxide electrode, thus opening up a new field of semiconductor photocatalysis. After that, there was an upsurge of research on titanium dioxide all over the world. The main methods for synthesizing titanium dioxide are hydrothermal synthesis, sol-gel method, solvothermal method, chemical vapor precipitation method and microemulsion method. Compared with many synthet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C01G23/053
Inventor 孔岩秦华林伟章志超吕忆农
Owner NANJING UNIV OF TECH
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