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Preparation method of titanium dioxide and doped body of titanium dioxide

A technology of titanium dioxide and titanium salt, which is applied in the field of preparation of titanium dioxide and its doped body, can solve the problems that it cannot be used as a photocatalyst alone and is easy to decompose when exposed to light, and achieves the effects of uniform size, simple preparation method, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2015-07-01
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As an important inorganic photosensitive material, silver halide has good photocatalytic activity under visible light, but it cannot be used as a photocatalyst alone because it is easy to decompose when exposed to light.

Method used

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  • Preparation method of titanium dioxide and doped body of titanium dioxide
  • Preparation method of titanium dioxide and doped body of titanium dioxide
  • Preparation method of titanium dioxide and doped body of titanium dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 10g of glucose and 6g of polyvinylpyrrolidone (K30) in 60mL of water, then add 10mL of acetic acid, 4.3g of n-tetrabutyl titanate, 0.298g of potassium iodide and 0.315g of silver nitrate, wherein the molar weight of potassium iodide and silver nitrate is titanate 15% of n-tetrabutyl ester, the mixed solution was transferred to a closed reaction kettle, and reacted at 200°C for 5 hours, and a columnar gel was obtained after the reaction. figure 1 (a), after the gel was dried, it was calcined at 500 °C for 3 hours to obtain a silver iodide-doped titanium dioxide photocatalyst, and its powder diffraction pattern is shown in figure 2 , it can be seen from the figure that the synthesized titanium dioxide powder is anatase phase (PDF No.21-1272), and there are obvious peaks of silver iodide (PDF No.09-0374); Degradation effect see Figure 4 (2).

Embodiment 2

[0025] Dissolve 5.5g sucrose and 0.5g polyacrylamide (Mw: 2000000~14000000) in 20mL water, then add 4.3g n-tetrabutyl titanate, 0.147g potassium bromide and 0.21g silver nitrate, among which potassium bromide and nitric acid The molar weight of silver is 10% of that of n-butyl titanate. Transfer the mixed solution to a closed reaction kettle and react at 200°C for 5 hours. After the reaction, a cylindrical gel is obtained. See figure 1 (b), After the gel was dried, it was calcined at 500 °C for 3 hours to obtain the silver bromide-doped titania photocatalyst.

Embodiment 3

[0027] Dissolve 5g of lactose and 0.6g of polyacrylamide (Mw: 2000000~14000000) in 15mL of water, add 10mL of acetic acid, and then add 2.37g of titanium tetrachloride, 0.019g of potassium iodide and 0.02g of silver nitrate, of which, potassium iodide and silver nitrate The molar weight is 1% of titanium tetrachloride. Transfer the mixed solution to a closed reaction kettle and react at 200°C for 5 hours. After the reaction, a cylindrical gel is obtained. After the gel is dried, it is calcined at 500°C for 3 hours to obtain Silver iodide doped titanium dioxide photocatalyst.

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Abstract

The invention discloses a preparation method of a titanium dioxide photocatalyst. The method comprises the following steps: dissolving water-soluble carbohydrate and water-soluble macromolecules into water in a closed container, adding with organic acid or alkali, and then adding with a soluble titanium salt, and reacting at 140-300 DEG C, dewatering and calcining, so as to obtain the titanium dioxide photocatalyst. The titanium dioxide photocatalyst is cheap and easily available in raw material, and simple in preparation method; with three-dimensional net carbon aerogel as a template, a silver halide-doped titanium dioxide photocatalyst is hotly synthesized by a one-pot method; and the obtained titanium dioxide photocatalyst is good in crystallization degree, uniform in size and high in catalytic efficiency in a visible light region, and can be applied to degradation of organic pollutants.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide and its doped body. Background technique [0002] As an n-type semiconductor material, titanium dioxide has attracted widespread attention because of its stable chemical properties, cheap and easy to obtain, non-toxic and high ultraviolet photocatalytic efficiency, and has a good application prospect in the photocatalytic degradation of environmental pollutants. However, due to the wide bandgap of titania (E g =3.2eV), the photogenerated electron-hole pairs are easy to recombine and have poor absorption ability to visible light, which greatly limits the application of photocatalysis. Therefore, the visible light modification of titanium dioxide and the improvement of quantum yield have become the hotspots of current research. Commonly used titanium dioxide modification methods include organic dye photosensitization, metal / non-metal element doping, semiconductor recombination and noble ...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01J21/06A62D3/17A62D101/26A62D101/28
Inventor 雷鸽娟陈奇利杨凯迪王筱罗静王雪刘旭林非妮赵君博谢钢
Owner NORTHWEST UNIV
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