Tungsten trioxide powder and preparation method thereof

A technology of tungsten trioxide and powder, which is applied in the field of tungsten trioxide powder and its preparation, can solve the problems of weak photocatalytic degradation performance and gas sensing performance, achieve excellent gas sensing performance, suitable for large-scale production, and simple operation Effect

Inactive Publication Date: 2018-02-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tungsten trioxide microparticles in the tungsten trioxide powder produced in the prior art are generally rod-shaped or flake-shaped, and its photocatalytic degradation performance and gas sensing performance are weak

Method used

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  • Tungsten trioxide powder and preparation method thereof
  • Tungsten trioxide powder and preparation method thereof
  • Tungsten trioxide powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Reference figure 1 , This embodiment provides a method for preparing tungsten trioxide powder, which includes the following steps:

[0039] S1, 0.3299g sodium tungstate dihydrate (Na 2 WO 4 ·2H 2 O) Dissolve in 10 mL of distilled water to prepare a sodium tungstate solution with a concentration of 0.1 mol / L. Then add 35% by mass hydrochloric acid solution to the sodium tungstate solution with a concentration of 0.1 mol / L, adjust the pH of the sodium tungstate solution added with the hydrochloric acid solution to 2.7, and stir for 30 min after adding the hydrochloric acid solution to make the hydrochloric acid The solution and the sodium tungstate solution are evenly mixed to obtain a precursor solution. It can be understood that the precursor solution contains water, tungstate ions, sodium ions, hydrogen ions, and chloride ions at this time.

[0040] S2. Transfer the precursor liquid to the reaction kettle, and seal the precursor liquid in the reaction kettle for reaction, ...

Embodiment 2

[0060] This embodiment is based on embodiment 1, and specifically includes the following steps:

[0061] S1, add 3.2990g sodium tungstate dihydrate (Na 2 WO 4 ·2H 2 O) Dissolve in 10 mL of distilled water to prepare a sodium tungstate solution with a concentration of 1 mol / L. Then add 96% by mass nitric acid solution to the 1mol / L sodium tungstate solution, adjust the pH of the sodium tungstate solution added with nitric acid solution to 2.8, and stir for 30 minutes after adding the nitric acid solution to make the nitric acid solution Mix well with sodium tungstate solution to obtain precursor liquid. It can be understood that the precursor solution contains water, tungstate ions, sodium ions, hydrogen ions, and nitrate ions at this time.

[0062] S2. The precursor liquid is transferred to the reaction kettle, and the precursor liquid is sealed in the reaction kettle for reaction. The reaction temperature is controlled to 160°C and the reaction time is 48 hours to obtain a reacti...

Embodiment 3

[0071] This embodiment is based on embodiment 1, and specifically includes the following steps:

[0072] S1, add 3.2990g sodium tungstate dihydrate (Na 2 WO 4 ·2H 2 O) Dissolve in 20 mL of distilled water to prepare a sodium tungstate solution with a concentration of 0.5 mol / L. Then add 35% by mass hydrochloric acid solution and 98% by mass nitric acid solution to the sodium tungstate solution with a concentration of 0.5 mol / L, and adjust the pH of the sodium tungstate solution with hydrochloric acid solution and nitric acid solution to 2.75, and add the hydrochloric acid solution and stir for 30 minutes to mix the hydrochloric acid solution, nitric acid solution and sodium tungstate solution uniformly to obtain the precursor solution.

[0073] S2. Transfer the precursor liquid to the reaction kettle, and seal the precursor liquid in the reaction kettle for reaction. Control the reaction temperature to 170°C and the reaction time to 42 hours to obtain the reaction solution, and the...

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Abstract

The invention relates to a preparation method of tungsten trioxide powder. The preparation method comprises the following steps of adding a hydrochloric acid solution and/or a nitric acid solution into a sodium tungstate solution, regulating the PH (Potential of Hydrogen) of the sodium tungstate solution to be 2.7 to 2.8, and uniformly mixing the sodium tungstate solution and the hydrochloric acidsolution and/or the nitric acid solution, so as to obtain a precursor solution; sealing the precursor solution in a reaction kettle to carry out a reaction, controlling a reaction temperature to be 160 to 180 DEG C and a reaction time to be 36 to 48 hours, so as to obtain reaction liquid, and then cooling the reaction liquid to be a room temperature; separating out a solid substance from the cooled reaction liquid; washing and oven-drying the solid substance, so as to obtain the tungsten trioxide powder, wherein the shapes of 95 percent or above of tungsten trioxide micron particles in the tungsten trioxide powder are elliptical. According to the preparation method, the tungsten trioxide powder containing 95 percent or above of the elliptical tungsten trioxide micron particles is preparedfor the first time; the prepared tungsten trioxide powder, through a performance test, has higher catalytic degradation ability and excellent gas sensing performance and moreover, the method utilizeshydrothermal-method synthesis, and has the advantages of simple operation, lower cost and suitability for large-scale production.

Description

Technical field [0001] The invention relates to a tungsten trioxide powder and a preparation method thereof. Background technique [0002] At present, tungsten trioxide has been used in many aspects of daily life, for example, it is often used to make X-ray phosphors, refractory materials, and gas sensors. In addition, due to its full yellow color, tungsten trioxide is often used as a paint in ceramics and painting. In addition, tungsten trioxide is also used in emerging electrochromic glass and smart glass. The light transmittance of the glass is adjusted by changing the voltage applied to both ends of the glass. In this way, this type of glass is widely used in construction, such as control Indoor temperature, or used as a photoelectric switch in the field of communication control. [0003] In addition to the above-mentioned applications, tungsten trioxide has an important application field, that is, photocatalytic degradation of dyes. Tungsten trioxide, as a semiconductor mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02
CPCC01G41/02C01P2002/72C01P2002/84C01P2004/01C01P2004/16C01P2004/32
Inventor 付海涛王文文杨晓红安希忠
Owner NORTHEASTERN UNIV
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