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Preparation method of anatase nanometer titanium dioxide with exposed high-activity crystal surface

A nano-titanium dioxide, anatase technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of polluting the environment, corroding equipment, danger, etc.

Active Publication Date: 2016-01-06
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology

Titanium dioxide has three crystal structures: anatase type, rutile type and brookite type. Among them, the brookite type belongs to the orthorhombic crystal system, which is generally difficult to prepare and has low photocatalytic activity. There are few studies at present.
And HF is a kind of highly corrosive liquid, it is more dangerous to use HF directly, there are problems such as corroding equipment and polluting the environment.

Method used

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  • Preparation method of anatase nanometer titanium dioxide with exposed high-activity crystal surface

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The following method was used to prepare anatase nano-titanium dioxide with exposed highly active crystal plane {001}:

[0028] 1) Mix 5 mL of titanium source isopropyl titanate, 20 mL of isopropanol, and 5 mL of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid in a 250 mL beaker to prepare solution A;

[0029] 2) After adding 7.7 mL of acetic acid to solution A ( n CH 3 COOH: n Ti 4+ =8:1), stirred at a speed of 600r / min for 1h to prepare solution B;

[0030] 3) Put solution B into a polytetrafluoroethylene-lined hydrothermal reaction kettle, place it in a blast drying oven at 180°C, react for 24 hours, and then cool to room temperature;

[0031] 4) Pour off the supernatant in the hydrothermal reaction kettle, filter the remaining solid-liquid mixture, and collect the sediment;

[0032] 5) Wash the precipitate obtained in step 4) with absolute ethanol and deionized water several times until the filtrate is neutral;

[0033] 6) Dry the precipitate washed...

Embodiment 2 to Embodiment 4

[0036] Examples 2 to 4 respectively prepared 1#, 2# and 3# anatase-type nano-titanium dioxide exposed to highly active crystal plane {001}, the preparation method is the same, only in step 2) n CH 3 COOH and n Ti 4+ The ratio of reaction temperature in step 3) is different, see Table 1 for details:

[0037] The different preparation conditions of table 1 embodiment two to four

[0038] Example n CH 3 COOH: n Ti 4+ Reaction temperature (°C) Example 2 6:1 160 Example 3 8:1 180 Example 4 8:1 160

[0039] 2. Photocatalytic performance test

[0040] The evaluation of the photocatalytic performance of the anatase nano-titanium dioxide exposed to the highly active crystal plane {001} prepared by the above method as a catalyst was carried out in a PhchemIII photochemical reactor produced by Beijing Newbit Technology Co., Ltd. The photocatalytic performance of the samples was evaluated by degrading the methyl orange solution. As a com...

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Abstract

The invention provides a preparation method of anatase nanometer titanium dioxide with an exposed high-activity crystal surface. According to the method, isopropyl titanate is used as a titanium source; isopropanol and 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid are used as morphology control agents; acetic acid is used as a reaction solvent; the nanometer titanium dioxide is prepared by a solvothermal method. The anatase nanometer titanium dioxide containing rich {001} crystal surfaces is prepared by regulating the mole ratio of the acetic acid to the isopropyl titanate, the solvothermal reaction temperature and the solvothermal reaction time. The product prepared by the method has the advantages of high exposure rate of high-activity crystal surfaces {001}, safety, environment-friendly effect and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic substances, and in particular relates to a preparation method of anatase nano-titanium dioxide exposed to highly active crystal planes. Background technique [0002] With the rapid development of industry, the growth of population and the improvement of people's living standards, people's consumption and demand for energy continue to increase, which leads to the continuous reduction of fossil fuels in the earth and the increasingly serious environmental pollution. Human survival is facing unprecedented challenges. Solving problems such as energy crisis, global warming, and environmental degradation is not only a test for governments, but also a threat to human health and development. Therefore, seeking for sustainable clean energy and convenient and quick methods to eliminate environmental pollution is a hot topic of research by scientists all over the world. As one of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 郝世雄姜亚萍余祖孝周维维钟远海
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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