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A preparation method of titanium dioxide particles whose surface is doped with rare earth elements

A technology of titanium dioxide and rare earth elements, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc. can not stimulate other problems

Active Publication Date: 2021-04-09
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of TiO 2 There are two outstanding problems encountered in the process of photocatalytic materials: 1) TiO 2 The band gap energy is large, and it can only be excited by ultraviolet light, but not directly by visible light
However, neither of the above two invention patents can realize the surface doping of rare earth metal elements

Method used

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  • A preparation method of titanium dioxide particles whose surface is doped with rare earth elements
  • A preparation method of titanium dioxide particles whose surface is doped with rare earth elements
  • A preparation method of titanium dioxide particles whose surface is doped with rare earth elements

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Experimental program
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Effect test

Embodiment 1

[0022] The equipment structure of the reaction device

[0023] The schematic diagram of the reaction device used in the present invention is as figure 1 As shown, its main structural units are: 1. Plasma spray gun, 2. Powder inlet, 3. Liquid material inlet, 5. Powder collector. When working, the plasma spray gun converts the working gas argon and hydrogen into high-energy plasma, which is ejected from the nozzle to form a plasma jet (4) with a temperature of up to 17000 °C. After the plasma jet is stabilized, use N 2 The carrier gas sends the sprayed titanium dioxide powder particles into the plasma radially through the powder inlet 2, and the powder will be rapidly heated to a molten or semi-molten state in the high-temperature plasma jet, and at the same time, it is synchronously fed into the plasma through the symmetrically positioned liquid material inlet 3 Rare earth element precursors are gasified at high temperature to dope titanium dioxide, and then collected by the ...

Embodiment 2

[0025] Surface doped with lanthanum ions

[0026] (1) Start the plasma spray gun: the working power of the spray gun is 55kW, the argon gas in the plasma gas is 40 slpm, and the hydrogen gas is 11 slpm.

[0027] (2) Implement doping: use N 2 The gas sends titanium dioxide powder particles with an average particle size of 15-40 μm into the plasma jet, the carrier gas flow rate is 5L / min, and the powder feeding amount is 15g / min. At the same time, the aqueous solution of lanthanum nitrate with a mass ratio of 5% is continuously sent into the plasma jet with a pressure of 1.5 mbr and a flow rate of 30 mL / min, and titanium dioxide is doped after high-temperature ionization.

[0028] (3) After the temperature of the collector is cooled to room temperature, collect the reaction product.

[0029] The as-prepared TiO surface doped with lanthanum ions 2 Powder SEM photos are attached figure 2 As shown, it can be observed from the figure that the particle size of the powder is unif...

Embodiment 3

[0031] surface doped with cerium ions

[0032] Titanium dioxide particles doped with cerium ions can be prepared by changing the rare earth precursor in step (2) of Example 2 to cerium nitrate, and keeping other steps and conditions unchanged. After doping with rare earth ions, the titanium dioxide particles not only have a good response to ultraviolet light, but also have a stable response to visible light with a wavelength of 400-600nm. Obviously, using it as a photocatalyst has a higher utilization efficiency of sunlight.

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Abstract

The invention discloses a method for preparing titanium dioxide particles whose surface is doped with rare earth elements, and belongs to the technical field of inorganic material preparation. The plasma spray gun is used as the reaction device, so that the titanium dioxide powder particles fed in are melted or semi-melted in a high-temperature, high-speed jet, and the rare earth element precursor is synchronously fed in the form of a liquid material, and the titanium dioxide is doped after high-temperature gasification. The invention has the advantages of one-step synthesis, simple and convenient operation, short time consumption, controllable doping amount, high catalyst activity and the like. The prepared titanium dioxide particle doped with rare earth element has good stability, high crystallinity, spherical shape and smooth surface. Because the doping effect reduces the forbidden band width of the photocatalyst, the catalyst can enhance the absorption ability of visible light and have higher catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a method for preparing titanium dioxide particles whose surface is doped with rare earth elements. Background technique [0002] TiO 2 The material can use sunlight to carry out photocatalytic reaction, and has potential application value in the fields of environmental protection, medical treatment and health. However, the application of TiO 2 There are two outstanding problems encountered in the process of photocatalytic materials: 1) TiO 2 The band gap energy is large, and it can only be excited by ultraviolet light, but not directly by visible light. 2) TiO 2 The generated electron-hole pairs have a high recombination rate, which greatly reduces the quantum efficiency. Therefore, increasing the TiO 2 To improve the photocatalytic efficiency, it is necessary to expand the light absorption range of the catalyst and suppress the recomb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/08
CPCB01J23/10B01J35/004B01J35/08
Inventor 刘学璋
Owner JIANGXI SCI & TECH NORMAL UNIV
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