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Method for preparing nanoscale granular W18O49 material

A W18O49, granular technology, applied in the field of preparation of nano-scale granular W18O49 materials, can solve the problems of not much research on exposed active crystal planes, the influence of physical and chemical properties, and difficulty, and achieve good photocatalytic performance and short preparation period. , the effect of low energy consumption

Active Publication Date: 2016-01-27
广西自贸区见炬科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently W 18 o 49 There are still deficiencies in the research of materials in the field of synthesis and their photocatalytic properties: on the one hand, since tungsten oxide has a variety of stoichiometric ratios, the preparation of pure-phase W 18 o 49 Difficult, which will have a certain impact on its physical and chemical properties
And multi-dimensional, especially three-dimensional structure W 18 o 49 Rarely reported, nanoscale granular W 18 o 49 never reported
In addition, there are few studies on controlling the orientation growth of materials, exposing active crystal planes

Method used

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  • Method for preparing nanoscale granular W18O49 material
  • Method for preparing nanoscale granular W18O49 material
  • Method for preparing nanoscale granular W18O49 material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Weigh 0.7931g analytically pure WCl 6 , Prepare 0.05mol / L solution A with 40mL absolute ethanol.

[0027] 2) Add 0.9004g analytically pure oxalic acid (H 2 C 2 o 4 ), making oxalic acid (H 2 C 2 o 4 ) and WCl 6 The ratio of the amounts of the substances is 10:1 to obtain solution B.

[0028] 3) Seal solution B with a plastic wrap to avoid contact with air, stir with a magnetic stirrer for 30 minutes, and treat with ultrasonic (50 Hz) for 20 minutes to obtain solution C.

[0029] 4) Pour solution C into a 100mL polytetrafluoroethylene-lined autoclave, keeping the volume filling ratio at 40%.

[0030] 5) Put the sealed reactor into a homogeneous hydrothermal reactor, and react at 100° C. for 24 hours.

[0031] 6) After the reaction is completed, cool down to room temperature with the furnace, centrifuge the final reactant, and wash with absolute ethanol 3 times. The centrifuged material was dried in a vacuum oven at 50°C to obtain nanoscale granular W 18 o ...

Embodiment 2

[0033] The difference from Example 1 is that in step 5), the reaction was carried out at 120° C. for 24 h. Other steps are all identical with embodiment 1.

Embodiment 3

[0035] The difference from Example 1 is that in step 5), the reaction was carried out at 140° C. for 24 h. Other steps are all identical with embodiment 1.

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Abstract

The invention provides a method for preparing a nanoscale granular W18O49 material. The method comprises the steps of adding WC16 into absolute ethyl alcohol to prepare a solution A; adding oxalic acid into the solution A to obtain a solution B, wherein the mass ratio of the oxalic acid to the WC16 to is (5 to 10) to 1; sealing the solution B, stirring, and then performing ultrasonic treatment, so as to obtain a solution C; enabling the solution C to react in a homogeneous reactor, and obtaining the nanoscale granular W18O49 material after the reaction. The prepared homogeneously dispersed nanoscale granular W18O49 material is uniform in chemical constitution, high in purity, and uniform in shape, and the W18O49 is a nano-particle with the diameter being 20nm. The W18O49 material has relatively large specific surface area, and more active crystal faces are enabled to exposed at the same time, so that catalytic efficiency is greatly improved. The reaction temperature is low, the condition is mild, the energy consumption is less, the preparation process is simple, the cost is lower, the process is easy to control, the preparation period is short, and the method is easy to implement and is friendly to environment.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a method for preparing nanoscale granular W 18 o 49 material method. Background technique [0002] Tungsten oxide is an n-type semiconductor, and its physical and chemical properties have many characteristics. Since the discovery of nano-tungsten oxide with photochromic properties in the 1970s, researchers at home and abroad have successively studied the photocatalytic and capacitive properties of nano-tungsten oxide. A lot of research has been done on the aspects of photosensitive, gas sensitive performance and powder preparation. Due to the relatively large specific surface of nano-tungsten oxide, the surface effect is significant, and because it has a strong absorption capacity for electromagnetic waves, it can be used as an excellent solar energy absorbing material, and has photocatalytic properties. Some research results have been applied to people. in daily l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y30/00
Inventor 黄剑锋海国娟介燕妮曹丽云李嘉胤吴建鹏孔新刚卢靖张博
Owner 广西自贸区见炬科技有限公司
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