A preparation method of anatase nano-titanium dioxide exposed highly active crystal facets

A technology of nano-titanium dioxide and anatase, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as difficulty in preparation, environmental pollution, danger, etc.

Active Publication Date: 2016-08-10
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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AI Technical Summary

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, and there are problems such as corroding equipment and polluting the environment.

Method used

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  • A preparation method of anatase nano-titanium dioxide exposed highly active crystal facets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Anatase nano-TiO2 with exposed high-activity crystal plane {001} was prepared by the following method:

[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 (nCH 3 COOH: nTi 4+ =8:1), stir at a speed of 600 r / min for 1 h to obtain solution B;

[0030] 3) Put solution B into a hydrothermal reactor lined with PTFE, and place it in a blast drying oven at 180 °C, react for 24 h, and then cool to room temperature;

[0031] 4) Pour off the supernatant in the hydrothermal reaction kettle, perform suction filtration on the remaining solid-liquid mixture, and collect the precipitate;

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

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

Embodiment 2 to Embodiment 4

[0036] In Examples 2 to 4, 1#, 2# and 3# anatase-type nano-titania with exposed high-activity crystal plane {001} were prepared respectively. The preparation method is the same, only the nCH in step 2). 3 COOH and nTi 4+ The ratio of , the reaction temperature in step 3) are different, see Table 1 for details:

[0037] Table 1 Different preparation conditions of Examples 2 to 4

[0038] Example

nCH 3 COOH: nTi 4+

Reaction temperature (℃)

Example 2

6:1

160

Example 3

8:1

180

Example 4

8:1

160

[0039] 2. Photocatalytic performance test

[0040] The photocatalytic performance evaluation of the anatase nano-TiO2 prepared by the above method exposing the highly active crystal plane {001} 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 methyl orange solution. As a comparison, t...

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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 type nano-titanium dioxide with exposed high-activity 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, resulting in the continuous reduction of fossil fuels contained 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, the search for sustainable clean energy and convenient and quick ways to eliminate environmental pollution is a research hotspot of scientists all over the world. As on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C01G23/053
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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