A kind of two-dimensional titanium dioxide crystal form, sol and preparation method thereof

A technology of titanium dioxide and sol, which is applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as limiting catalytic activity, and achieve strong catalytic effect, strong catalytic activity, and large specific surface area.

Active Publication Date: 2019-11-26
CHONGQING JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

According to the literature, the forbidden band width of nano-titanium dioxide is 3.2eV, which can only absorb ultraviolet light, and ultraviolet light only accounts for 5% of the solar spectrum, which limits the catalytic activity. Therefore, expanding the photoresponse range of nano-titanium dioxide is important for the improvement of catalytic performance. influences

Method used

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  • A kind of two-dimensional titanium dioxide crystal form, sol and preparation method thereof
  • A kind of two-dimensional titanium dioxide crystal form, sol and preparation method thereof
  • A kind of two-dimensional titanium dioxide crystal form, sol and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] Example 1: Preparation of a two-dimensional titania sol

[0033] At a temperature of 0°C, take 2ml of titanium tetrachloride and add it to a mixture composed of 7ml of absolute ethanol, 0.6ml of polyvinylpyrrolidone and 20ml of deionized water, start stirring, and set the rotation speed to 300r / min for stirring. After 20 minutes, a mixed solution was obtained; then, 11 ml of an ammonia solution with a mass concentration of 26% was added dropwise to the mixed solution to adjust the pH of the mixed solution to 7.0, and a white precipitate was obtained. Centrifuge the white precipitate, set the speed of the centrifuge to 12000r / min, and centrifuge for 7 minutes. After the centrifugation is over, wash it with 80ml of deionized water for 9 times until it does not contain chloride ions; A mixture of 20ml of 30% hydrogen peroxide and sodium peroxide and 120ml of deionized water, then placed in a temperature of 110°C for condensing and refluxing for 3.5h to obtain a transparent...

Embodiment 2

[0044] Embodiment 2 A kind of preparation method of two-dimensional titanium dioxide

[0045] At a temperature of -1°C, take 1ml of titanium tetrachloride and add it to a mixture composed of 12ml of absolute ethanol, 1ml of polyvinylpyrrolidone and 30ml of deionized water, start stirring, set the speed at 500r / min for stirring, and stir After 10 minutes, a mixed solution was obtained; then, 3 ml of ammonia solution with a mass concentration of 28% was added dropwise to the mixed solution to adjust the pH of the mixed solution to 6.5, and a white precipitate was obtained. Centrifuge the white precipitate, set the speed of the centrifuge to 16000r / min, and centrifuge for 3min. After the centrifugation is over, wash it with 120ml of deionized water for 8 times until it does not contain chloride ions; The mixture 16ml of 30% hydrogen peroxide and sodium peroxide and 100ml of deionized water are then placed in a temperature of 120°C and condensed and refluxed for 3h to obtain a tra...

Embodiment 3

[0047] Embodiment 3: A kind of preparation method of two-dimensional titanium dioxide

[0048] At a temperature of 1°C, take 4ml of titanium tetrachloride and add it to a mixture composed of 12ml of absolute ethanol, 0.1ml of polyvinylpyrrolidone and 15ml of deionized water, start stirring, and set the rotation speed to 200r / min for stirring. After 40 minutes, a mixed solution was obtained; then, 12 ml of an ammonia solution with a mass concentration of 25% was added dropwise to the mixed solution to adjust the pH of the mixed solution to 6.5, and a white precipitate was obtained. Centrifuge the white precipitate, set the speed of the centrifuge to 4000r / min, and centrifuge for 10 minutes. After the centrifugation, wash 10 times with 50ml of deionized water until it does not contain chloride ions; The mixture 16ml of 30% hydrogen peroxide and sodium peroxide and 150ml of deionized water are then placed in a temperature of 90°C and condensed and refluxed for 4h to obtain a tran...

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Abstract

The invention discloses a to-dimensional titanium dioxide crystal form which has diffraction peaks at diffraction angles 2theta such as 8.78 degrees, 26.66 degrees, 38.80 degrees, 46.75 degrees and 58.07 degrees. The crystal form is of a three-dimensional nanosheet structure stacked by square single crystals; with a large specific surface area, the crystal form is particularly suitable for the preparation of composite materials; and the crystal form is strong in catalytic activity, has relatively high photocatalytic degradation activity for organic pollutants, excrement and the like, has a high degradation rate of 80.6% for methyl orange in three hours. Without doping, the crystal form is capable of enlarging light response range of titanium dioxide to a visible light area, thereby improving the product activity. According to the crystal form, the problem of acid-base pollution in the preparation process is solved; corrosive agents are not used in the preparation process, so that no secondary pollution is caused to the environment and the product stability is good; the crystal form still has relatively strong catalytic effect after being put at room temperature for 8 months; and the preparation process is simple and feasible and industrial production is easy to realize.

Description

technical field [0001] The invention relates to a new crystal form product of titanium dioxide, in particular to a two-dimensional titanium dioxide sol product and a preparation method thereof. Background technique [0002] In recent years, the rapid development of industry and economy has also brought serious environmental pollution problems. Therefore, solving environmental pollution problems has become a basic national policy. In 1972, since Japanese scientists Honda and Fujishima Akira prepared hydrogen through photoelectrolysis of titanium dioxide, many scientists at home and abroad have applied photocatalysis to the treatment of environmental pollutants. Therefore, photocatalysis has become an effective method to fundamentally solve the problem of environmental pollution. One of the methods. [0003] Among various photocatalysts, nano-titanium dioxide photocatalysts produce active substances with strong redox properties under the excitation of ultraviolet light, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C09D7/61C02F1/30B01J21/06C02F101/36C02F101/38
CPCB01J21/063B01J35/004C01G23/0536C01P2002/72C01P2002/80C01P2004/04C01P2004/62C02F1/30C02F2101/308C02F2101/36C02F2101/38C02F2305/10C09D7/61C09D7/70
Inventor 郭小峰王宏波向前王丽影柴坝李力向阳开
Owner CHONGQING JIAOTONG UNIVERSITY
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