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Method for preparing nano-silver loaded tungsten trioxide with high photocatalytic activity

A catalytic activity, tungsten trioxide technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve difficult problems such as environmental friendliness, complicated preparation methods and processes, and the method is simple and easy to achieve , The effect of simple process operation and easy operation

Inactive Publication Date: 2011-04-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for modifying the surface of tungsten oxide photocatalysts with noble metals to improve their photocatalytic activity basically involve the doping of noble metal nanocrystals. The preparation methods are complex and involve a variety of organic solvents, making it difficult to be environmentally friendly.

Method used

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  • Method for preparing nano-silver loaded tungsten trioxide with high photocatalytic activity
  • Method for preparing nano-silver loaded tungsten trioxide with high photocatalytic activity
  • Method for preparing nano-silver loaded tungsten trioxide with high photocatalytic activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The preparation method of this embodiment comprises the following steps:

[0021] 1) Preparation of tungsten oxide flake nanomaterials: After dispersing and dissolving 3.5g of sodium tungstate in 20ml of deionized water by ultrasonic for 10-15 minutes, uniformly pass through the column filled with cation exchange resin, and control the exchange rate to 25 drops / min. Fully exchanged to obtain light yellow colloid of tungstic acid. After standing and aging for 18 hours, hydrothermally reacted at 160 degrees Celsius for 24 hours, washed with ethanol and deionized water for 3 times respectively, and obtained tungsten trioxide flake nanomaterials (see the attached figure 2 ).

[0022] 2) Ultraviolet light reduction: Accurately prepare 200 ml of silver nitrate solution with a mass concentration of 0.4%wt, add an appropriate amount of nitric acid until the solution is an acidic system with pH=1, and place it in an ultrasonic generator in the dark for 10 ...

Embodiment 2

[0025] Example 2: The preparation method of this embodiment comprises the following steps:

[0026] 1) Preparation of tungsten oxide flake nanomaterials: Disperse and dissolve 43.7g sodium tungstate in 250ml deionized water by ultrasonic for 60 minutes, then uniformly pass through the column filled with cation exchange resin, and control the exchange rate to 50 drops / min for full exchange , the light yellow colloid of tungstic acid was obtained. After standing and aging for 24 hours, hydrothermally reacting at 180 degrees Celsius for 24 hours, washing with ethanol and deionized water for 5 times respectively, to prepare tungsten trioxide flake nanomaterials.

[0027] 2) Ultraviolet light reduction: Accurately prepare 500 ml of silver nitrate solution with a mass concentration of 0.4%wt, add an appropriate amount of nitric acid until the solution is an acidic system with pH=1, and place it in an ultrasonic generator in the dark for 30 minutes for ultrasonic dispersion...

Embodiment 3

[0029] Example 3: The preparation method of this embodiment comprises the following steps:

[0030] 1) Preparation of tungsten oxide flake nanomaterial: same as the preparation of tungsten oxide flake nanomaterial in Example 1.

[0031]2) Ultraviolet light reduction: Accurately prepare 250 ml of silver nitrate solution with a mass concentration of 0.4%wt, add an appropriate amount of nitric acid until the solution is an acidic system with pH=1, and place it in an ultrasonic generator in the dark for 15 minutes for ultrasonic dispersion. Add the tungsten oxide flake nanomaterial prepared in step 1 to the above silver nitrate solution, and ultrasonically disperse it in an ultrasonic generator for 20 minutes, then place it under an ultraviolet lamp (wavelength 254nm) for 20 minutes, and finally obtain the product .

[0032] 3) Subsequent treatment: centrifuge the product and filter the supernatant by decantation, wash twice with ethanol and deionized water respectively...

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Abstract

The invention relates to a method for preparing a nano-silver loaded tungsten trioxide with high photocatalytic activity, which belongs to the technical field of inorganic photocatalyst preparation process. The method of the invention is characterized in that the method comprises the following steps: preparing a tungsten trioxide nano sheet as a substrate by using a new method; then through an ultraviolet reduction method, uniformly loading nano silver on the tungsten trioxide nano sheet; and roasting the obtained product at a certain temperature in the state of wetting so as to obtain a novel nano-silver loaded tungsten trioxide, thereby achieving the purpose of improving the photocatalytic activity of the tungsten trioxide. The photocatalyst prepared by using the method in the invention can be used for processing discharged industrial wastewater such as dye wastewater and the like, and compared with other methods, the catalytic efficiency of the photocatalyst prepared by using the method in the invention is greatly improved; and meanwhile, the method in the invention has the advantages of simple process and environmental protection, etc.

Description

technical field [0001] The invention relates to a preparation method of nano-silver loaded tungsten trioxide with high photocatalytic activity, and belongs to the technical field of inorganic photocatalyst preparation technology. Background technique [0002] Tungsten trioxide (WO 3 ) is an important photocatalytic semiconductor material, which is widely used in the field of semiconductor heterogeneous photocatalysis technology to solve industrial wastewater and domestic sewage pollution control. [0003] WO 3 The traditional manufacturing methods of nanomaterials include laser deposition method, sol-gel method, vacuum evaporation method, high temperature gas phase method and so on. These methods or growth control parameters require high precision and poor reproducibility, or the size of the nanostructure of the product is not uniform, it is difficult to control the particle size, and it is not convenient for industrialization. At the same time, although WO 3 The phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J37/16C02F1/32
CPCY02W10/37
Inventor 向群马文杰孟桂芳张源钱群李辉徐甲强
Owner SHANGHAI UNIV
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