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Polymer-modified high-activity nano-titanium dioxide catalyst and preparation method thereof

A nano-titanium dioxide and polymer technology, which is applied in the direction of physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, chemical instruments and methods, etc., can solve the problem of high recombination rate of photogenerated carriers and restricts practical application Process, reduce photocatalytic activity and other issues, to achieve the effect of reducing recombination rate, large grain size, and improving separation efficiency

Inactive Publication Date: 2012-02-15
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Titanium dioxide synthesized by existing methods has the disadvantages of high recombination rate of photogenerated carriers and easy agglomeration while maintaining small particle size and large specific surface area, which reduces its photocatalytic activity and seriously restricts its practical application process.

Method used

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  • Polymer-modified high-activity nano-titanium dioxide catalyst and preparation method thereof
  • Polymer-modified high-activity nano-titanium dioxide catalyst and preparation method thereof
  • Polymer-modified high-activity nano-titanium dioxide catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] The preparation method of polymer-modified high-activity nano-titanium dioxide catalyst is to take organic alkoxide or inorganic salt of titanium, add inorganic acid as hydrolysis catalyst, and add polymer as surface modifier, stir at low temperature, keep reflux after heating up, and reflux The temperature of the hydrothermal reaction of the sol is 100°C, the time is 2 hours, cooled to room temperature, the obtained powder is washed with water to neutrality, and then washed twice with ethanol, centrifuged, vacuum-dried, the temperature is 60°C, A polymer-modified highly active nano-titanium dioxide catalyst is obtained.

[0029] In the preparation method of the polymer-modified high-activity nano-titanium dioxide catalyst, the organic alkoxide of titanium is one of tetrabutyl titanate, isopropyl titanate, ethyl titanate and ethanol, isopropyl Alcohol, butanol or a mixture of two, the molar concentration is 0.01-2M, the inorganic salt of titanium is one of titanium tetr...

Embodiment 2

[0033] Preparation of highly active nano-titanium dioxide catalyst modified by polyacrylic acid, take a beaker and add 22mL of tetrabutyl titanate, 8mL of isopropanol, mix magnetically for 30 minutes, take a 250mL three-necked bottle, add 150mL of 1.5M hydrochloric acid solution and Stir different amounts of polyacrylic acid evenly, and control the temperature below 5°C with an ice-water cooling bath. Pour the mixed solution of tetrabutyl titanate and isopropanol into the dropping funnel and slowly add it dropwise into the three-neck flask, and stir for 1 hour (the whole process is completed in an ice-water bath). The temperature was raised to 70-90°C at reflux for 1-4 hours. After the reflux is completed, cool to room temperature and separate layers, take the lower layer of milky white liquid, put it in an autoclave lined with polytetrafluoroethylene, carry out hydrothermal reaction at 220 °C for 10 hours, and cool naturally to room temperature, and the obtained powders are r...

Embodiment 3

[0035]The preparation of the highly active nano-titanium dioxide catalyst modified by the polymer of Example 2, except that the titanium source used is isopropyl titanate, all the other reaction conditions such as hydrolysis, hydrothermal etc. are the same as in Example 2, and the prepared titanium dioxide light The phase structure and composition of the catalyst are close to those in Example 2, and the activity of the titanium dioxide photocatalyst prepared with isopropyl titanate as a titanium source is close to that of the catalyst obtained in Example 2.

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Abstract

A polymer-modified high-activity nano-titanium dioxide catalyst and a preparation method thereof. Titanium dioxide synthesized by existing methods has the disadvantages of high recombination rate of photogenerated carriers and easy agglomeration while maintaining small particle size and large specific surface area, which reduces its photocatalytic activity and seriously restricts its practical application process. . Take the organic alkoxide or inorganic salt of titanium, add inorganic acid as a hydrolysis catalyst, and add polymer as a surface modifier, stir at low temperature, keep reflux after heating up, and the temperature for hydrothermal reaction of the sol after reflux is 100-220°C , the time is 1-48 hours, cooled to room temperature, the obtained powder is washed with water to neutrality, and then washed with ethanol 2-3 times, centrifuged and vacuum-dried at a temperature of 40-70°C to obtain polymer-modified Highly active nano titanium dioxide catalyst. The invention belongs to the field of nanometer materials.

Description

Technical field: [0001] The invention relates to a titanium dioxide catalyst with large specific surface area, uniform and ultrafine particle size, high activity and a preparation method thereof. Background technique: [0002] With the development of environmental protection technology and the continuous improvement of people's requirements for environmental quality, highly active photocatalytic materials have become the most eye-catching new technology for treating water and air pollution. At present, the catalysts used in photocatalytic technology are mostly N-type semiconductor materials, such as TiO 2 , ZnO, CdS, WO 3 , SnO 2 , Fe 2 o 3 Wait. [0003] Among many semiconductor photocatalysts, TiO 2 It has attracted much attention because of its high catalytic activity, good stability, low price and non-toxicity. But TiO 2 It is limited by two bottleneck factors, the high recombination rate of photogenerated carriers and the low utilization rate of sunlight, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J21/06C02F1/30A61L9/22
Inventor 辛柏福付宏刚颜焱
Owner HEILONGJIANG UNIV