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Grey titanium dioxide nano-material, as well as preparation method and application thereof

A technology of titanium dioxide and nanomaterials

Active Publication Date: 2014-03-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts solvothermal method to hydrolyze titanium source, uses acid as structure control agent, and roasts under protective atmosphere to obtain highly active gray titanium dioxide, so as to realize the transformation of titanium dioxide color from white to gray, thereby overcoming the difficulty of titanium dioxide in absorbing visible light and its utilization low rate problem

Method used

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  • Grey titanium dioxide nano-material, as well as preparation method and application thereof
  • Grey titanium dioxide nano-material, as well as preparation method and application thereof
  • Grey titanium dioxide nano-material, as well as preparation method and application thereof

Examples

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example 1

[0022] Sample G 0 Preparation process: Add 40ml of ethanol to a beaker, then add 10ml of tetrabutyl titanate, and stir evenly. Then 1.0ml of hydrofluoric acid (40%) was added dropwise, stirred evenly, moved to an autoclave, and reacted at 180°C for 25h. Cooling, washing, vacuum drying, and finally calcination at 300°C for 10 hours under a nitrogen atmosphere to obtain titanium dioxide nanomaterials (sample G 0 ), which is rendered in gray. From the XRD diffraction pattern of the sample (attached figure 1 ) It can be seen that the sample is anatase titanium dioxide with a grain size of 50nm. From the SEM image of the sample (attached image 3 ) can also be observed; from the UV-vis map of the sample (attached figure 2 ) It can be seen that the sample has a strong absorption for light with a wavelength of 400-800nm.

[0023] Sample G 0 Catalytic reaction: Add 30ml of 5mg / L methylene blue solution to the test tube, then add 20mg of sample, place in a photoreactor, stir for...

example 2

[0025] Sample G 1 Preparation process: Add 50ml of isopropanol to a beaker, then add 10ml of tetrabutyl titanate, and stir evenly. Then 3.0ml of concentrated sulfuric acid (70%) was added dropwise, stirred evenly, moved to an autoclave, and reacted at 180°C for 5h. Cooling, washing, vacuum drying, and finally roasting at 500°C for 10 hours under a nitrogen atmosphere to obtain titanium dioxide nanomaterials (sample G 1 ), the color is gray, the sample is anatase titanium dioxide, and the grain size is 50nm.

[0026] Sample G 1 Catalytic reaction: Add 30ml of 5mg / L methylene blue solution to the test tube, then add 20mg of sample, place in photoreactor, stir for 1h to reach adsorption equilibrium. Turn on the xenon lamp, react for 3 hours, and take a sample every hour. The concentration of methylene blue was analyzed by a UV-visible spectrophotometer. The degradation rate of methylene blue in this sample was 96% under visible light, which was better than 75% of commercial P...

example 3

[0028] Sample G 2 Preparation process: Add 20ml of butanol to a beaker, then add 10ml of titanium isopropoxide, and stir evenly. Then 4.0ml of concentrated sulfuric acid (70%) was added dropwise, stirred evenly, moved to an autoclave, and reacted at 180°C for 15h. Cooling, washing, vacuum drying, and finally baking at 700 °C for 10 hours under an argon atmosphere to obtain titanium dioxide nanomaterials (sample G 2 ), whose color is gray, from the XRD diffraction pattern of the sample (attached Figure 5 ) It can be seen that the sample is anatase titanium dioxide with a grain size of 60nm.

[0029] Sample G 2 Catalytic reaction: Add 30ml of 5mg / L methylene blue solution to the test tube, then add 20mg of sample, place in photoreactor, stir for 1h to reach adsorption equilibrium. Turn on the xenon lamp, react for 3 hours, and take a sample every hour. The concentration of methylene blue was analyzed by a UV-visible spectrophotometer. The degradation rate of methylene blue...

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Abstract

The invention relates to a grey titanium dioxide nano-material, as well as a preparation method and application of the grey titanium dioxide nano-material. The material is characterized in that the color is grey, the crystal form is anatase type, the grain size is 50-70nm, and the material can absorb visible light with wavelength in a range of 400-800nm. A titanium source and a morphology control agent react in a high-pressure kettle by adopting a solvothermal method, and calcined in a certain atmosphere to obtain the grey titanium dioxide. The flake-shaped titanium dioxide nano-material is grey, which is a breakthrough of changing white and blue titanium dioxide to grey titanium dioxide. The material has the characteristics of simple preparation method, low cost, adjustable morphology and crystal form and excellent photocatalysis performance, and expected to be applied to paint, water pollution treatment and other industries.

Description

technical field [0001] The invention relates to a gray nano titanium dioxide material and its preparation method and application, belonging to the technical field of titanium dioxide photocatalysis, and is characterized in that the utilization rate of visible light is increased through modification. Background technique [0002] In 1972, Professor Fujishima of the University of Tokyo in Japan discovered that titanium dioxide and platinum electrodes could be used to decompose water to generate hydrogen and oxygen by light, thus opening up a new academic field of photocatalysis, and at the same time setting off an upsurge in photocatalysis research. As a stable, low-toxic, and cheap semiconductor material, titanium dioxide has become one of the most important materials in the field of photocatalysis. Titanium dioxide exists in nature in three crystal forms: anatase, rutile and brookite, and anatase and brookite can be transformed into thermodynamically stable rutile after high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/32C02F101/30
Inventor 孔岩章志超程俊阳刘艳冬
Owner NANJING UNIV OF TECH
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