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Preparation method of titanium dioxide particle with surface doped with rare earth element

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 be excited and other problems, to achieve the effect of high crystallinity, ideal catalytic activity, and short time consumption

Active Publication Date: 2019-01-25
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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  • Preparation method of titanium dioxide particle with surface doped with rare earth element
  • Preparation method of titanium dioxide particle with surface doped with rare earth element
  • Preparation method of titanium dioxide particle with surface doped with rare earth element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Equipment structure of reaction device

[0023] The schematic diagram of the reaction device used in the present invention is as figure 1 As shown, the 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 of up to 17000°C (4). After the plasma jet is stable, use N 2 The carrier gas sends the sprayed titanium dioxide powder particles radially into the plasma through the powder inlet 2. 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 will be simultaneously fed through the symmetrical liquid inlet 3 The rare earth element precursor is doped with titanium dioxide after high temperature gasification, and then collected by the powder collector 5. The maximum power of this system can rea...

Embodiment 2

[0025] Lanthanum ion doped on the surface

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

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

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

[0029] The prepared TiO doped with lanthanum ions 2 The powder SEM photo is attached figure 2 As shown in the figure, it can be observed that the particle size of the powder is uniform, the shape of the powder parti...

Embodiment 3

[0031] Surface doped with cerium ion

[0032] The rare earth precursor in step (2) in Example 2 is changed to cerium nitrate, and other steps and conditions remain unchanged, and cerium ion-doped titanium dioxide particles can be prepared. After being doped 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 to 600 nm. Obviously, using it as a photocatalyst has a higher utilization efficiency of sunlight.

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Abstract

The invention discloses a preparation method of a titanium dioxide particle with a surface doped with a rare earth element, and belongs to the technical field of the preparation of inorganic materials. The preparation method comprises the following steps of adopting a plasma spray gun as a reaction device, enabling a sent-into titanium dioxide powder particle to be fused or semi-fused in high-temperature and high-speed jet flow, synchronously sending into a rare earth element precursor in a liquid material manner, gasifying at high temperature, and then doping titanium dioxide. The preparationmethod has the advantages of one-step synthesis, simple and convenient operation, short time consumption, controllable doping amount and high catalyst activity and the like. The prepared rare earth element doped titanium dioxide particle is good in stability and high in crystallinity; further, the particle is spherical; and the surface is smooth. As the forbidden band gap of the photocatalyst isdecreased by a doping effect, the absorbing capacity, to visible light, of a catalyst is enhanced; and the catalyst has higher catalytic activity.

Description

Technical field [0001] The invention belongs to the technical field of inorganic material preparation, and specifically relates to a method for preparing titanium dioxide particles doped with rare earth elements on the surface. Background technique [0002] TiO 2 The material can use sunlight to carry out photocatalytic reactions and has potential application value in environmental protection, medical and health and other fields. However, using TiO 2 Two outstanding problems encountered in the process of photocatalytic materials: 1) TiO 2 The band gap energy is relatively large and can only be excited by ultraviolet light, but cannot be directly excited by visible light. 2)TiO 2 The generated electron-hole pair recombination rate is high, which greatly reduces the quantum efficiency. Therefore, increase TiO 2 The photocatalytic efficiency must expand the light absorption range of the catalyst and inhibit the recombination of photo-generated electrons and holes. The current metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/08
CPCB01J23/10B01J35/51B01J35/39
Inventor 刘学璋
Owner JIANGXI SCI & TECH NORMAL UNIV
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